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Phase/grain boundary assisted-3D static globularization mechanism of TC17 alloy based on the microstructure reconstruction and in-situ TEM observation

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Journal of Materials Science & Technology 2023年第26期157卷 246-261页

作者： Haoyu Pang yingang liu Jiao Luo Cong Li Hong Li School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China

Lamellar globularization in the dual-phase titanium alloy is the key to improving plasticity and ***,the mechanism has not been fully elucidated so *** this work,the role of phase/grain bound-ary in the static globularization of TC17 alloy was systematically studied by setting differentαphase con-tent before annealing through low-and high-temperature *** compression causes the parallel distribution and fragmentation of 3Dαplates and few globularαparticles are formed at a strain rate of 1 s^(-1).Post-deformation annealing promotes the static globularization ofαphase while it is affected by initialαphase *** 730°C deformation,the development ofα/αinterface by absorbing dislocations promotes the formation of globularαgrains based on the nucleation of sepa-ratedαparticles and pre-recoveryαsubgrain during subsequent ***α/α/βandα/β/βtriple junctions formed due to highαcontent with about 36%volume fraction are favorable for the further nucleation and growth of globularαgrains by reducing interface energy,forming a 3D irregularα*** nucleation and growth of theβphase dominate the microstructure evolution during subsequent an-nealing,resulting in the local dissolution of the plate and formation ofα*** 850°C deformation,theαphase tends to nucleate at theβ/β/βtriple junctions and grow into a lamellar shape along the high energyβ/βgrain boundary due to lowαcontent with about 7%volume ***αnucleation that maintains the Burgers orientation relationship(BOR)with the surroundingβphase grows along the habit plane and thickens slowly,resulting in the formation of a precipitatedαplate with a flat surface and the suppression of static *** comprehensive investigation of lamellar globularization provides guidance for optimizing the 3D microstructure and properties of dual-phase titanium alloy.

关键词： Titanium alloy Static globularization 3D microstructure Phase/grain boundary Nucleation and growth In-situ TEM heating

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Effect of processing parameters on the densification of an additively manufactured 2024 Al alloy

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Journal of Materials Science & Technology 2020年第23期58卷 34-45页

作者： Qiyang Tan yingang liu Zhiqi Fan Jingqi Zhang Yu Yin Ming-Xing Zhang School of Mechanical and Mining Engineering The University of QueenslandSt.LuciaQLD 4072Australia

Understanding the densification behaviours and formation mechanisms of defects are essential to fabricate high quality and high strength aluminium components using selective laser melting(SLM) technology. In this work, the effects of laser power and scanning speed on the densification, defects evolution and their formation mechanisms in a SLMed 2024 aluminium(Al) alloy were investigated in consideration of the corresponding laser energy input, melting mode transition and microstructural evolution. The results showed that optimizing the processing parameters effectively reduced the porosity level below1% by avoiding the lack of fusion and keyhole melting mode, and minimizing the gas pores. However,optimization of the processing parameters could not eliminate the columnar structure associated with the SLMed 2024 Al alloy, which contributed to the hot-tearing cracks in the SLMed parts. It was found that the dependence of porosity formation on SLM processing parameters was contrary to the crack density. Hence, to further improve the SLM-processability of the 2024 Al alloy it is necessary to develop SLM methods in order avoid the hot-cracking within the optimized processing parameter window associated with the minimum porosity formation.

关键词： Powder Bed Fusion Aluminum alloys Metallography Defects SEM

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Laser powder b e d fusion of copper matrix iron particle reinforced nanocomposite with high strength and high conductivity

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Journal of Materials Science & Technology 2023年第3期134卷 50-59页

作者： yingang liu Jingqi Zhang Qiang Sun Meng Li Ming Yan b Xing Cheng Miaoquan Li Ming-Xing Zhang School of Mechanical and Mining Engineering The University of QueenslandSt.LuciaQLD 4072Australia Department of Materials Science and Engineering and Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials Southern University of Science and TechnologyShenzhen 518055China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China

Liquid-liquid phase separation,and the resulted solute segregation,during conventional solidification have been a long-term challenge to produce copper(Cu)-iron(Fe)immiscible composites with high strength and high *** present work reports an effective solution to this issue through laser powder bed fusion(L-PBF)in-situ alloying of Cu-8 wt.%*** observation showed that the fast cooling within micron-scale melt pools fully eliminated the Fe segregation and therefore the L-PBF fabricated nanocomposite achieved the homogeneous microstructure,which featured equiaxed fine grains around 1μm in *** of the nanocomposite at 600℃for 1 h enabled precipitation of two types of *** is coarser Fe nanoprecipitates with body-centered cubic(BCC)structure and diam-eter of 100-300 nm,mainly distributing along grain *** other is smaller Fe nanoprecipitates with face-centered cubic(FCC)structure and diameter of 10-35 nm,being observed within the grains and having coherent interfaces with the Cu *** a result,the aged Cu-Fe nanocomposite achieved tensile strength of 462.9±6.6 MPa with 30.4%±1.7%elongation to failure and 74.5%IACS(International Annealed Copper Standard)electrical *** formation mechanisms of the nanoprecipitates and the strengthening mechanisms of the nanocomposite are discussed.

关键词： Immiscible alloy Copper Laser powder bed fusion Ageing Nanocomposite

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Heterogeneous lamella design to tune the mechanical behaviour of a new cost-effective compositionally complicated alloy

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Journal of Materials Science & Technology 2022年第1期96卷 113-125页

作者： Yu Yin Qiyang Tan Qiang Sun Wangrui Ren Jingqi Zhang Shiyang liu yingang liu Michael Bermingham Houwen Chen Ming-Xing Zhang School of Mechanical and Mining Engineering University of QueenslandQLD 4072Australia College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

A heterogeneous lamella(HL)design strategy was applied to manipulate mechanical properties of a new cost-effective Fe_(35)Ni_(35)Cr_(25)Mo_(5)compositionally complicated alloy(CCA).The HL structure was produced by single-step heat treatment(800℃for 1 h)after cold *** HL structure consists of alternative lamellae regions of coarse-grained FCC matrix(5-20μm),and regions containing ultra-fine grains or subgrains(200-500 nm)together with nanoprecipitates(20-500 nm)and annealing *** compared with other cost-effective CCAs,the 800℃annealed sample with HL structure demonstrated a comparable tensile property,with yield strength over 1.0 GPa and total elongation of~13%.Formation of the annealing twins and nanoprecipitates decorated HL structure was a result of the concurrent partial recrystallization and precipitation ofσphase at the shear bands with a high density of lattice defects(***-density dislocation walls and deformation twins).The latter restricted the growth of recrystallized grains,leading to the formation of ultrafine subgrains within the HL *** high yield strength resulted from the multistage hetero-deformation induced(HDI)strengthening and precipitation strengthening associated with heterogeneous lamella structures containing *** ductility was originated from the coexistence of multiple deformation mechanisms,which started with dislocation slip and formation of stacking faults at the initial stage,followed by nano-twinning at the higher strain *** HL design strategy,comprising composition and thermomechanical process designs,and the resultant microstructure tuning,open a broader window for the development of cost-effective CCAs with enhanced performance.

关键词： High entropy alloys Compositionally complicated alloys Heterogeneous lamella structure Nanoprecipitates Recrystallization Mechanical properties

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Effect of Heating Temperature and Heating Rate on Austenite in the Heating Process of 300M Steel

Effect of Heating Temperature and Heating Rate on Austenite ...

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中国材料大会2012

作者： yingang liu Miaoquan Li Xiaoling Dang School of Materials Science and Engineering Northwestern Polytechnical University Beijing Institute of System Engineering

ISBN: (纸本)9783037856093

The growth behavior of 300M steel was investigated on a Gleeble-3500 simulator at the heating temperatures ranging from 1273 K to 1453 K and the heating rates ranging from 0.83 K/s to 40 K/*** grain size of austenite was measured by using SISC IAS V8.0 image analysis software on Olympus PMG3 *** experimental results showed that the coarse grains of austenite occurred at the heating temperature above 1413 K and the grain size of austenite increased with the increasing of heating temperature and decreased with the increasing of heating *** grain boundaries of austenite became flat and the angel of grain boundaries tended to 120° with the increasing of heating *** grain boundaries of austenite increased and changed from flat to bend with the increasing of heating rate.

关键词： 300M steel Heating temperature Heating rate Austenite.

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An animal model to create intervertebral disc degeneration characterized by radiography and molecular biology

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Journal of Nanjing Medical University 2008年第5期22卷 308-312页

作者： Zhengming Sun Miao liu yingang Zhang Department of Orthopaedics the First Affiliated Hospital of Xi' an Jiaotong University Xi' an 710061 Shaanxi Province China

Objectives： To develop a rabbit model of intervertebral disc degeneration that more exactly simulates the pathological changes of human intervertebral disc degeneration. Methods： Twelve New Zealand white rabbits were utilized to establish three different disc injury models according to the following protocol; group A： anulus punctures were done with a 18-gauge needle at L2-L3 and L5-L6; Group B： intradiscal injection of interleukin-1 IL-1β with a 23-gauge needle at L3-L4; and Group C： intradiscal injection of phosphate buffer saline（PBS） with a 23-gauge needle at L4-LS. The L1-L2 level was used as a control. Rabbits were killed after 24 weeks. The intervertebral disc height was measured by lateral plain radiographs. After the radiographic measurements were obtained, the intervertebral discs were removed and analyzed for DNA, sulfated glycosaminoglycan（s-GAG） and water contents of nucleus pulposus. Results： The intervertebral disc height, s-GAG, and water contents in anulus needle punctures were significantly decreased in Group A, but the DNA content in the nucleus pulposus was significantly increased when compared to the control. The significant decrease of disc height and water contents were demonstrated, only the s-GAG and DNA contents did not show a significant difference in Group B when compared to the control. The significant decrease of disc height, s-GAG, water, and DNA contents did not show in Group C when compared to the control. Conclusion： The 18-gauge puncture models produced the most consistent disc degeneration in the rabbit lumbar spine.

关键词： intervertebral disc degeneration animal model rabbit

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雷达健康管理的性能评估方法

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现代雷达 2015年第11期37卷 12-15页

作者：刘应刚于兴伟解放军95921部队

针对相控阵雷达,分析了阵面性能对雷达战术指标的影响,提出了利用相控阵多通道实时监测信息评估雷达战术指标的方法。仿真结果显示:利用该方法可有效评估相控阵雷达阵面的健康状态以及阵面性能恶化对雷达技术指标的影响,实现雷达健康管... 详细信息

针对相控阵雷达,分析了阵面性能对雷达战术指标的影响,提出了利用相控阵多通道实时监测信息评估雷达战术指标的方法。仿真结果显示:利用该方法可有效评估相控阵雷达阵面的健康状态以及阵面性能恶化对雷达技术指标的影响,实现雷达健康管理与维修保障的有机结合,提升雷达全寿命周期保障的智能化程度。同时,对提高雷达作战效能和战斗力快速生成具有重要意义。

关键词：雷达综合保障性能评估预测与健康管理

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The effect of spinal cord injury on the expression of TGF-β and TNF-α in rat articular cartilage

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Journal of Nanjing Medical University 2007年第3期21卷 155-158页

作者： Dongqi Wang Min Wang yingang Zhang Miao liu Department of Orthopedics the First Affiliated Hospital of Medical School Xi＇an Jiaotong University Xi＇an 710061 China

Objective： To observe the expression of TGF-β and TNF-α in the spinal cord injured rat model and discuss the significance of the articular cartilage metabolism. Methods： 36 SD female rats were randomly divided into 2 groups： Rats models of spinal cord injury were implemented by Allen method. T10 laminectomy was performed in the control group. Both groups of rats were killed respectively in 1w, 3w and 6w. Hematoxylin-eosin stain was given to each slice in the model group and control group. Immunohistochemical stain was applied by using ABC method in the expression of TGF-β and TNF-α. Those expressed level were performed in image analysis and statistics process. Results： TGF-β and TNF-α were mainly distributed on the surface layer of the articular cartilage, with a weak expression in control group. The expression of TNF-α in the model group was more significant than that in the control group in the lw, and still remained an evident difference with that in control group until the 6w（P 〈 0.05）. TGF-β expression of the model group had no remarkable difference with the control group in the lw （P 〉 0.05） and prominently became stronger at 6w（P 〈 0.05）. Conclusion： The expression of TNF-α occurred early in the development of spinal cord injury, and the expression of TGF-β became stronger with the revival of spinal neural function. Both expressions were strengthened in articular cartilage in the 3rd week.

关键词： spinal cord injury (SCI) articular cartilage transforming growth factor(TGF-β) tumor necrosis factor (TNF-α)

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护士站点滴监测系统的研究与设计

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计算机测量与控制 2012年第9期20卷 2429-2431,2434页

作者：郭瑞刘银刚丁柏闻辽宁工程技术大学电气与控制工程学院辽宁葫芦岛125105

目前,医院普通病房患者静脉输液过程中存在的问题较多,例如点滴滴速无法科学监测,原有点滴控制系统结构过于复杂,临床难以实现等;针对以上问题,研究并提出了一种不同于以往点滴监控系统的新思路,设计了一种全新的液体点滴检测系统;该系... 详细信息

目前,医院普通病房患者静脉输液过程中存在的问题较多,例如点滴滴速无法科学监测,原有点滴控制系统结构过于复杂,临床难以实现等;针对以上问题,研究并提出了一种不同于以往点滴监控系统的新思路,设计了一种全新的液体点滴检测系统;该系统在不改变传统输液形式的前提下,利用槽式光电传感器监测点滴每分钟滴数,同时引入无线传感器网络进行数据采集和信息收发;通过这些设计,弥补了以往点滴监控系统结构复杂,不易实现等缺点和不足,临床易于实现,具有较高的实用价值。

关键词：液体点滴监测静脉输液无线传感器网络数据采集信息收发

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盾构方案模糊评判

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铁路工程造价管理 2011年第5期26卷 33-35页

作者：秦银刚刘景铎天津市地下铁道集团有限公司天津300051

针对地铁盾构施工方案,从工期、造价、环境、工程机械投入等方面进行因素分析,采用专家打分法确立模糊矩阵、层次分析法确定各因素权重,并利用模糊综合评判法对地铁某标段盾构施工筹划各方案进行优选,最终确定最优方案。

关键词：地铁盾构施工模糊矩阵综合评判最优方案

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