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Influence of post-heat treatment on the microstructure and mechanical properties of Al-Cu-Mg-Zr alloy manufactured by selective laser melting

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Journal of Materials Science & Technology 2022年第16期111卷 35-48页

作者： Yanfang wang Xin Lin Nan Kang zihong wang Yuxi Liu Weidong Huang State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi’an 710072China

The properties of modified conventional wrought aluminum alloys cannot be significantly enhanced by normal post-heat treatment in that the fine-grained strengthening,arising from high cooling rate in SLM,is *** this work,compared with the normal T6 heat treatment,a novel simple direct aging regime was proposed to maintain the grain-boundary strengthening and to utilize the precipitation strengthening of secondary *** was found that a heterogeneous grain structure,which consisted of ultrafine equiaxed(~0.82μm)and columnar(~1.80μm)grains at the bottom and top of molten pool,respectively,was formed in the SLM processed *** direct aging(DA),the ultrafine grains were maintained and a mass of spherical coherent L1-AlZr particles with a mean radius of approximately1.15 nm was *** contrast,after solution treatment and aging(STA),a significant grain coarsening occurred in the equiaxed grain ***,the coarsening L1-AlZr particles,nano-sized S phases and GPB zones were detected in the STA *** subsequently induced that the yield strength of the DA sample(~435 MPa)was higher than that of the STA sample(~402 MPa)owing to the grain boundary strengthening and precipitation *** the STA and DA samples exhibited a higher strength than that of the other SLMed Al-Cu-Mg series alloys;this was comparable to that of the wrought AA2024-T6 alloy(~393 MPa).Both the STA and DA samples exhibited a higher strength than that of the other SLMed Al-Cu-Mg series alloys;this was comparable to that of the wrought AA2024-T6alloy(~393 MPa).

关键词： Selective laser melting Al-Cu-Mg alloy Heat treatment Microstructure Mechanical properties

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Laser powder bed fusion of Zr-modified Al-Cu-Mg alloy:Processability and elevated-temperature mechanical properties

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Journal of Materials Science & Technology 2023年第5期136卷 223-235页

作者： Yanfang wang Xin Lin Yufan Zhao zihong wang Xiaobin Yu Xuehao Gao Weidong Huang State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi’an 710072China

Zr modification is an effective method for improving hot-cracking resistance and elevated-temperature mechanical properties during laser powder bed fusion(L-PBF)of traditional medium and high strength wrought aluminum *** study investigated the l-PBF processability and elevated-temperature mechanical properties of a Zr-modified 2024Al *** was found that the hot-cracking susceptibility increased with the increased scanning speed,which was in reasonable agreement with the modified Rappaz-Drezet-Gremaud ***,the primary L1_(2)-Al_(3)Zr precipitates,which acted as ef-ficient nucleation sites,precipitated at the fusion boundary of the melt pool,leading to the formation of a heterogeneous grain *** yield strength(YS)of the as-fabricated samples at 150,250,and 350℃was 363,210,and 48 MPa,*** the slight decrease to 360 MPa of the YS when tested at 150℃,owing to the additional precipitate strengthening from the L1_(2)-Al_(3)Zr precipitates,the YS achieved yield strengths of 253 and 69 MPa,an increase of 20.5%and 30.4%,when tested at 250 and 350℃,*** yield strengths in both the as-fabricated and T6-treated conditions tested at 150 and 250℃were comparable to those of casting Al-Cu-Mg-Ag alloys and superior to those of traditionally heat-resistant 2219-T6 and 2618-T6 of Al-Cu alloys.

关键词： Laser powder bed fusion Zirconium Al-Cu-Mg alloy Processability Elevated-temperature mechanical property

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Wasserstein GAN-Based Small-Sample Augmentation for New-Generation Artificial Intelligence: A Case Study of Cancer-Staging Data in Biology

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Engineering 2019年第1期5卷 156-163页

作者： Yufei Liu Yuan Zhou Xin Liu Fang Dong Chang wang zihong wang College of Life Science and Technology Huazhong University of Science and Technology Wuhan 430074 China School of Public Policy and Management Tsinghua University Beijing 100084 China School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Center for Strategic Studies Chinese Academy of Engineering Beijing 100088 China

It is essential to utilize deep-learning algorithms based on big data for the implementation of the new generation of artificial intelligence. Effective utilization of deep learning relies considerably on the number of labeled samples, which restricts the application of deep learning in an environment with a small sample size. In this paper, we propose an approach based on a generative adversarial network (GAN) combined with a deep neural network (DNN). First, the original samples were divided into a training set and a test set. The GAN was trained with the training set to generate synthetic sample data, which enlarged the training set. Next, the DNN classifier was trained with the synthetic samples. Finally, the classifier was tested with the test set, and the effectiveness of the approach for multi-classification with a small sample size was validated by the indicators. As an empirical case, the approach was then applied to identify the stages of cancers with a small labeled sample size. The experimental results verified that the proposed approach achieved a greater accuracy than traditional methods. This research was an attempt to transform the classical statistical machine-learning classification method based on original samples into a deep-learning classification method based on data augmentation. The use of this approach will contribute to an expansion of application scenarios for the new generation of artificial intelligence based on deep learning, and to an increase in application effectiveness. This research is also expected to contribute to the comprehensive promotion of new-generation artificial intelligence.

关键词： Artificial intelligence Generative adversarial network Deep neural network Small sample size Cancer

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Solidification microstructure evolution and its correlations with mechanical properties and damping capacities of Mg-Al-based alloy fabricated using wire and arc additive manufacturing

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Journal of Materials Science & Technology 2023年第13期144卷 28-44页

作者： zihong wang Jingfeng wang Xin Lin Nan Kang Tianchi Zhang Yanfang wang Li wang Cong Dang Weidong Huang College of Materials Science and Engineering Chongqing UniversityChongqing 400045China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi’an 710072China Arts et Métiers Institute of Technology MSMPHESAM UniversitéChâlons-en-Champagne F-51006France Chongqing Construction Science Research Institute Chongqing 401147China

Magnesium(Mg)alloys,as the lightest metal structural material with good damping capacities,have im-portant application prospects in realizing structural lightweight and vibration ***,their engineering application is greatly limited by poor plastic *** and arc additive manufactur-ing(WAAM)provides a potential approach for fabricating large-scale Mg alloy components with high manufacturing *** this study,the evolution of the solidification microstructure of a WAAM-processed Mg-Al-based alloy was quantitatively analyzed based on the analytical models;then,the cor-relations between the solidification microstructure and mechanical properties/damping capacities were *** results revealed that the WAAM-processed Mg-Al-based alloy with an equiaxed-grain-dominated microstructure displayed a simultaneous enhancement in mechanical properties and damping capacities compared to those of the cast Mg-Al-based *** good combination of mechanical prop-erties and damping capacities are mainly attributed to the weakened basal texture with a relatively high Schmid factor for basalslip,the twinning-induced plasticity(TWIP)effect associated with the profuse{10-12}tensile twinning,and the relatively high dislocation density caused by the thermal stress during the WAAM process.

关键词： Wire and arc additive manufacturing Magnesium alloy Microstructure evolution Mechanical properties Damping capacities

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Laser-based directed energy deposition of novel Sc/Zr-modified Al-Mg alloys:columnar-to-equiaxed transition and aging hardening behavior

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Journal of Materials Science & Technology 2021年第10期69卷 168-179页

作者： zihong wang Xin Lin Yao Tang Nan Kang Xuehao Gao Shuoqing Shi Weidong Huang State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi'an 710072China

The control of grain morphology is important in laser additive manufacturing(LAM),as grain morphology further affects the hot cracking resistance,anisotropy,and strength–ductility synergy of *** develop a solidification-control solution and achieve columnar-to-equiaxed transition(CET)in Al-based alloys during LAM,Sc-and-Zr-modified Al-Mg alloys were processed via directed energy deposition(DED).CET was achieved by introducing high potent primary Al_(3)(Sc,Zr)nucleation sites ahead of the solidification ***,the relationship between the solidification control parameters and precipitation behavior of primary Al_(3)(Sc,Zr)nucleation sites was established using the time-dependent nucleation ***,the CET was studied according to the Hunt *** results indicated that coarse columnar grain structure was still obtained at the inner region of the molten pool at low Sc/Zr contents owing to the effective suppression of the precipitation of the primary Al_(3)(Sc,Zr)nucleation sites via rapid solidification during *** addition,the relatively low melt temperature at the fusion boundary unavoidably promoted the precipitation of primary Al_(3)(Sc,Zr)nucleation sites,which resulted in a fine equiaxed grains band at the edge of the molten *** the Sc/Zr content increased,the solidification cooling rate was not sufficient to suppress the precipitation of the primary Al_(3)(Sc,Zr)nucleation sites,and a fully equiaxed grain structure was ***,the effect of the layer-by-layer manufacturing process on the subsequent precipitation strengthening of secondary Al_(3)(Sc,Zr)precipitates was *** the remelting and subsequent aging during thermal cycling should be considered to achieve greater precipitation strengthening.

关键词： Al-Mg-Sc-Zr alloys Additive manufacturing Directed energy deposition Columnar-to-equiaxed transition Phase precipitation

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Effect of Cu content on microstructure and mechanical properties of in-situ β phases reinforced Ti/Zr-based bulk metallic glass matrix composite by selective laser melting(SLM)

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Journal of Materials Science & Technology 2021年第8期67卷 174-185页

作者： Xuehao Gao Xin Lin Qiaodan Yan zihong wang Xiaobin Yu Yinghui Zhou Yunlong Hu Weidong Huang State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MUT ChinaNorthwestern Polytechnical UniversityXi'an710072China

In this study,non-toxic in-situβphases of reinforced Ti/Zr-based bulk metallic glass matrix composites(BMGCs)of(Ti_(0.65)Zr_(0.35))100-xCux(x=5,10,15 at.%)are fabricated via selective laser *** effect of Cu content on phase formation,microstructure,and mechanical properties is *** average volume fraction and width of theβphase decreases with increasing Cu content,while a more amorphous phase and the(Ti,Zr)_(2)Cu phase *** the center zone of the molten pool,theβphase grows in the direction of the temperature gradient,and the amorphous phase distributes among theβ*** occurs using:sphere morphology(for x=5),a more continuous elongated sphere and network morphology(for x=10),and network morphology(for x=15),*** the edge zone of the molten pool,due to the smaller cooling rate and the existence of a partially molten zone,theβphase becomes coarser,and an amorphous phase forms for more continuous ***,the hardness improves significantly with increasing Cu *** crack is found for x=*** the average volume fraction of theβphase for x=5 is about 90%,the compression yield strength is 1386±64 MPa,reaching to an average level of conventionally fabricated counterparts,due to finer microstructure,and twinning and martensitic transformation of theβphase.

关键词： Metallic glass Amorphous phase βPhase Bulk metallic glass matrix composites(BMGCs) Additive manufacturing(AM) Selective laser melting(SLM)

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Laser powder bed fusion of high-strength Sc/Zr-modified Al–Mg alloy:phase selection,microstructural/mechanical heterogeneity,and tensile deformation behavior

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Journal of Materials Science & Technology 2021年第36期95卷 40-56页

作者： zihong wang Xin Lin Nan Kang Jing Chen Hua Tan Zhe Feng Zehao Qin Haiou Yang Weidong Huang State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi'an 710072China

Laser powder bed fusion(L-PBF)of Sc/Zr-modified Al-based alloys has recently become a promising method for developing a new generation of high-performance Al *** clarify the modification roles of Sc/Zr elements,an Al–4.66Mg–0.48Mn–0.72Sc–0.33Zr(wt.%)alloy was processed using *** effect of the local solidification condition of the molten pool on the precipitation behavior of primary Al_(3)(Sc,Zr)was analyzed based on time-dependent nucleation *** was found that primary Al_(3)(Sc,Zr)inevitably precipitated at the fusion boundary,while its precipitation could be effectively suppressed in the inner region of the molten *** subsequently induced the formation of a heterogeneousα-Al *** direct aging,the heredity of solidification microstructure introduced heterogeneous secondary Al_(3)(Sc,Zr)precipitates withinα-Al *** to the inverse relationship between grain boundary strengthening and precipitation strengthening,the direct-aged sample with dual heterogeneous structures exhibited reduced mechanical heterogeneity,resulting in lowered hetero-deformation-induced *** low strain-hardening capability in the direct-aged sample promoted necking instability while inducing a large Lüders elongation,which effectively improved the tensile ductility.

关键词： Additive manufacturing Al–Mg–Sc–Zr alloys Laser powder bed fusion Heterogeneous microstructure Deformation behavior

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Durable semi-crystalline interphase engineering to stabilize high voltage Ni-rich cathode in dilute ether electrolyte

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Journal of Energy Chemistry 2023年第4期79卷 110-117页

作者： Zhuangzhuang Cui Shunqiang Chen Qingshun Nian Yecheng Li Yawei Chen Bing-Qing Xiong zihong wang Zixu He Shuhong Jiao Xiaodi Ren School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026AnhuiChina

Ethers are promising electrolyte solvents for secondary Li metal batteries because of their excellent reduction ***,their oxidation stability has been mostly relying on the high concentration approach,and limited progress has been made on building effective interphase to protect the cathode from the corrosion of the *** this work,we construct a semi-crystalline interfacial layer on the surface of Li(Ni_(0.8)Co_(0.1)Mn_(0.1))O_(2)cathode that can achieve improved electrochemical stability in the highly corrosive chemical environment formed by the decomposition of ether *** from traditional brittle crystalline interphases,the optimized semi-crystalline layer with low modulus and high ionic conductivity can effectively relieve electrode strain and maintain the integrity of the interface *** to this design,the continuous oxidation decomposition of ether-based electrolytes could be significantly suppressed and the battery shows outstanding cycling stability(84%capacity retention after 300 cycles).This article provides a solution to address the oxidation instability issue of ether-based electrolytes.

关键词： Cathode/electrolyte interphase Semi-crystalline Ether electrolyte High-voltage cathode Li-metal batteries

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Laser polishing of a high-entropy alloy manufactured by selective laser melting

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Frontiers of Mechanical Engineering 2024年第5期19卷 73-86页

作者： Xiaojun TAN Haibing XIAO zihong wang Wei ZHANG Zhijuan SUN Xuyun PENG Zhongmin LIU Liang GUO Qingmao ZHANG Intelligent Manufacturing and Equipment School Shenzhen Institute of Information TechnologyShenzhen 518172China Sino-German Intelligent Manufacturing School Shenzhen City PolytechnicShenzhen 518116China Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Industrial Ultrashort Pulse Laser Technology Shenzhen 518055China College of Materials Science and Engineering Chongqing UniversityChongqing 400045China

The selective laser melting(SLM)technique applied to high-entropy alloys(HEAs)has attracted considerable attention in recent ***,its practical application has been restricted by poor surface *** this study,the capability of laser polishing on the rough surface of a Co-free HEA fabricated using SLM was *** show that the initial SLM-manufactured(as-SLMed)surface of the Co-free HEA,with a roughness exceeding 3.0μm,could be refined to less than 0.5μm by laser ***,the microstructure,microhardness,and wear resistance of the laser-polished(LP-ed)zone were *** indicate that compared with the microhardness and wear resistance of the as-SLMed layer,those of the LP-ed layer decreased by 4%and 11%,respectively,because of the increase in grain size and reduction of the BCC *** study shows that laser polishing has an excellent application prospect in surface improvement of HEAs manufactured by SLM.

关键词： laser polishing selective laser melting high-entropy alloy surface roughness mechanical performance

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中美经济对比中的民生与效率——以产值统计为基础分析

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四川大学学报（哲学社会科学版） 2017年第5期 120-128页

作者：王孜弘中国社会科学院美国研究所经济室

近三十余年来中美经济实力对比发生了较大的变化。无论是按美元现价计算的国内生产总值位居世界第二,还是按购买力平价计算的国内生产总值已超越美国成为世界第一,都展示了中国经济的崛起与规模的庞大。而人均国内生产总值与就业者人均... 详细信息

近三十余年来中美经济实力对比发生了较大的变化。无论是按美元现价计算的国内生产总值位居世界第二,还是按购买力平价计算的国内生产总值已超越美国成为世界第一,都展示了中国经济的崛起与规模的庞大。而人均国内生产总值与就业者人均国内生产总值的增长则分别体现了中国民生基础的改善与投入效率的提高。但同改革开放前夕比较,中国人均国内生产总值及就业者人均国内生产总值与包括美国在内的主要发达国家的差距却依然明显甚至有所扩大。但这未必反映出民生与效率的实际差距。重要原因之一是在中国特殊的人口结构及受此影响的消费方式下,产值统计对中国建设成就与财富增长有低估倾向。对中国而言,经济结构的调整比产值的提高更为重要。在结构调整尚未完成之前,还需防止以出口促进增长过程中通过运用比较劣势提升了产值,实际上却使经济实力受损的现象出现。

关键词：国内生产总值人均国内生产总值就业者人均国内生产总值民生基础人力投入效率

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