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In situ observation of transmission and reflection of dislocations at twin boundary in CoCrNi alloys

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Science China(Technological Sciences) 2021年第2期64卷 407-413页

作者： LIANG YanXiang YANG XiaoFang ming kaisheng XIANG ShiHua LIU Qing International Joint Laboratory for Light Alloys(Ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing 100191China

The deformation mechanism of CoCrNi alloy with high density of annealing twins was studied by in situ transmission electron microscopy. Dislocation transmission and reflection at the twin boundary were observed during in situ loading. We characterized these reaction processes by combining TEM, dislocation theory and crystallography of twin. Twin boundary not only strengthens the material by impeding the motion of dislocation, but also acts as dislocation source to produce large of slip bands. These processes generate large of slip bands to accommodate the plastic deformation or strengthening material.

关键词： dislocation transmission reflection TEM CoCrNi alloys

High-temperature strength-coercivity balance in a FeCo-based soft magnetic alloy via magnetic nanoprecipitates

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Journal of Materials Science & Technology 2021年第22期81卷 36-42页

作者： kaisheng ming Shuimiao Jiang Xiaoyuan Niu Bo Li Xiaofang Bi Shijian Zheng State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjin300130China Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin300130China Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing100191China School of Chemical Engineering and Technology Hebei University of TechnologyTianjin300130China

Precipitation strengthening is an effective approach to enhance the strength of soft magnetic alloys for applications at high temperatures,while inevitably results in deterioration in coercivity due to the pinning effect on the domain wall ***,we realize a good combination of high-temperature strength and ductility(ultimate tensile strength of 564 MPa and elongation of~20%,respectively)as well as low coercivity(6.97 Oe)of FeCo-2V-0.3Cr-0.2Mo soft magnetic alloy through introducing high-density magnetic *** magnetic nanoprecipitates are characterized by FeCo-based phase with disordered body-centered cubic structure,which enables the alloy to have a low *** addition,these nanoprecipitates can impede the dislocation motion and suppress the brittle fracture,which lead to a high tensile strength and *** work provides a guideline to enhance strength and ductility while maintaining low coercivity in soft magnetic alloys via magnetic nanoprecipitates.

关键词： FeCo-based soft magnetic alloys Strength Ductility Coercivity Magnetic nanoprecipitates

Dependence of Plastic Stability on 3D Interface Layer in Nanolaminated Materials

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Acta Metallurgica Sinica(English Letters) 2022年第11期35卷 1759-1764页

作者： Shuimiao Jiang Lichen Bai Qi An Zhe Yan Weiming Li kaisheng ming Shijian Zheng Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei Universityof TechnologyTianjin 300130China State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjin 300130China

The nanolaminated materials generally exhibit poor plasticity due to the fast onset of shear *** interface structure is an eff ective approach for enhancing plasticity via postponing or suppressing the shear ***,we introduce 4 nm thick CuNb 3D amorphous interface layers and Nb 3D crystalline interface layers in Cu nanolaminated materials,*** situ micro-pillar compression tests show that samples with crystalline interface layers exhibit shear instability,while the samples with amorphous interface layers display uniform *** the plastic deformation of the singlecrystal crystalline interface layer is anisotropic,except for well-aligned slip systems,dislocations on other slip systems have a poor ability to transmit the 3D crystalline interface layer,leading to localized dislocations pileups and shear *** contrast,the amorphous interface layer which is plastically isotropic accommodates dislocations from arbitrary slip systems of the matrix,which can alleviate the stress concentrations at the interface,and thus suppresses the shear instability.

关键词： Multilayers Interface Plastic deformation Dislocation Amorphous interface

Intermediate Temperature Fatigue Induced Precipitation and Associated Corrosion in CrMnFeCoNi High Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2023年第11期36卷 1857-1869页

作者： Tiezhuang Han Jing Wang Bo Li Shuang Li kaisheng ming Fucheng Wang Bin Miao Shijian Zheng Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin300401China

Understanding the corrosion behavior of high entropy alloys(HEAs)after intermediate temperature fatigue is critical to prevent their catastrophic failures from the reduction of corrosion ***,we investigated the corrosion behavior of CrMnFeCoNi HEA after 500℃ fatigue test with strain amplitudes of 0.2%and 0.5%.The intermediate temperature fatigue induced two types of precipitates,which were determined as Cr-richσphase and NiMn-rich L10 *** strain amplitude not only promoted precipitates generations but also spread the nucleation sites from intergranular to both intergranular and ***,we found that the deterioration in corrosion resistance of the alloy was derived from the increase of precipitates,which destroyed the stability of the passive *** above results revealed that intermediate temperature fatigue impaired the stabilization of the solid solution state and subsequent corrosion resistance of CrMnFeCoNi HEA,where the higher strain amplitude led to more precipitates and more severe corrosion.

关键词： High entropy alloy Corrosion Intermediate temperature fatigue Phase stability Precipitate

Cooperative effect of Cr and Al elements on passivation enhancement of eutectic high-entropy alloy AlCoCrFeNi_(2.1)with precipitates

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Journal of Materials Science & Technology 2023年第5期136卷 97-108页

作者： Xiaotian Duan Tiezhuang Han Xiao Guan Yuning Wang Huhu Su kaisheng ming Jing Wang Shijian Zheng State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjin 300130China School of Material Science and Engineering Hebei University of TechnologyTianjin 300130China

In conventional corrosion-resistant alloys,precipitation usually reduces corrosion resistance severely by weakening passive films *** this work,we found that the aging-treated AlCoCrFeNi_(2.1)sam-ples,which have abundant nanosized L 12 and body-centered cubic(BCC)precipitates in the lamellar face-centered cubic(FCC)and B2 phases,displayed better corrosion resistance than solution-treated AlCoCrFeNi_(2.1)samples without *** the AlCoCrFeNi_(2.1)alloy,the FCC phase with L1_(2)precipi-tates and the B2 phase with BCC precipitates were protected by passive films enriched with Cr and Al elements,***,the Al-rich passive film of the B2 phase was less stable than the Cr-rich passive film of the FCC phase,so B2 phase dissolved *** Cr-rich passive film of the FCC phase remained stable with the formation of Al-rich L1_(2)precipitates inside the phase because those precipitates with the size of∼5 nm were too small to affect the composition of the Cr-rich passive *** formation of Cr-rich BCC precipitates within the B2 phase increased the content of the Al element inside the phase,improving the stability of Al-rich passive film on the B2 ***,BCC precip-itates with the size of∼30 nm were protected by Cr-rich passive film,which could inhibit the expansion of corrosion ***,the corrosion resistance of eutectic high-entropy alloy AlCoCrFeN 2.1 was unprece-dentedly enhanced by the precipitation of BCC *** study could provide an attractive strategy for designing high-entropy alloys with excellent corrosion resistance and high strength.

关键词： Eutectic high-entropy alloy Passive film Corrosion resistance Precipitates TEM

晶界偏析以及界面相和纳米晶材料力学性能的调控

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材料研究学报 2023年第5期37卷 321-331页

作者：姜水淼明开胜郑士建河北工业大学材料科学与工程学院天津300401 天津市材料层状复合与界面控制技术重点实验室天津300401

介绍晶界偏析理论并总结了三种经典平衡偏析理论模型,简述晶界偏析工程理论和晶界偏析对材料力学性能的影响、讨论晶界偏析与界面相的关系并详细阐述了“界面相”。根据原子尺度界面结构特征将界面相分为六类,介绍了由晶界热力学决定的... 详细信息

介绍晶界偏析理论并总结了三种经典平衡偏析理论模型,简述晶界偏析工程理论和晶界偏析对材料力学性能的影响、讨论晶界偏析与界面相的关系并详细阐述了“界面相”。根据原子尺度界面结构特征将界面相分为六类,介绍了由晶界热力学决定的界面相转变。界面相转变后在晶界处形成新结构,而新界面结构根据其不同性质既可能提高材料性能,也可能产生不利的影响。晶界处的Ⅵ型界面相(如非晶晶间膜)抑制裂纹形核和降低晶界损伤,而削弱晶界处原子键强度的Ⅱ型界面相和Ⅲ型界面相(如Ni合金晶界处成分为Bi的双原子层界面相)产生晶界脆化。同时,纳米晶金属材料的强度高但是热稳定性和塑性较差,一直是研究的热点。界面相使晶界能显著降低和钉扎晶界而优于晶界偏析,因此界面相能显著提高纳米晶金属材料的热稳定性。而非晶晶间膜(Ⅵ型界面相)作为位错的形核点和吸收体,可提高纳米材料的延展性。同时,非晶晶间膜能提高晶界抗剪切能力,抑制纳米晶金属材料的晶粒滑动和旋转,从而进一步提高纳米晶金属材料的强塑性。最后,总结了晶界偏析和界面相对材料性能的调控并展望了以后的发展。

关键词：评述材料科学基础学科晶界偏析界面相纳米晶金属材料热稳定性力学性能

热处理对FeCo-2V-0.5Cr软磁合金力学与磁学性能的影响

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航空学报 2014年第10期35卷 2813-2818页

作者：陈慈航明开胜毕晓昉北京航空航天大学材料科学与工程学院北京100191

针对FeCo-2V-0.5Cr软磁合金,研究了真空热处理时间对其微观组织结构、力学与磁学性能的影响规律,发现在800℃下热处理时间为2h左右时,合金的抗拉强度和延伸率达到最佳,同时仍保持良好的软磁性能,抗拉强度、延伸率以及矫顽力分别为867.8... 详细信息

针对FeCo-2V-0.5Cr软磁合金,研究了真空热处理时间对其微观组织结构、力学与磁学性能的影响规律,发现在800℃下热处理时间为2h左右时,合金的抗拉强度和延伸率达到最佳,同时仍保持良好的软磁性能,抗拉强度、延伸率以及矫顽力分别为867.8MPa、10.4%以及2.0Oe。进一步对该合金进行附加磁场下的真空热处理,重点研究了合金的交流损耗与矫顽力随附加磁场方式包括磁场撤除温度与磁场下保温时间的变化规律,发现适当的磁场热处理对合金相关力学性能影响不大,但由于合金中产生了单轴各向异性而使合金矫顽力进一步降至1.6Oe。

关键词： FeCo合金磁场热处理微观组织力学性能软磁性能

加味温胆汤配合常规疗法治疗痰浊积肺型慢性阻塞性肺疾病急性加重期临床研究

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国际中医中药杂志 2014年第6期36卷 502-504页

作者：陈凯生刘铭魏卓红广东省潮州市湘桥区中医医院肝病科 521000 广东省潮州市人民医院康复科 510360 广东省潮州市中心医院中医科 521000

目的：观察加味温胆汤配合西医常规疗法治疗痰浊积肺型慢性阻塞性肺疾病急性加重期（acute exacerbation of chronic obstructive pulmonary diseases，AECOPD）的临床疗效。方法收集2010年7月至2013年6月广东省潮州市湘桥区中医医院呼... 详细信息

目的：观察加味温胆汤配合西医常规疗法治疗痰浊积肺型慢性阻塞性肺疾病急性加重期（acute exacerbation of chronic obstructive pulmonary diseases，AECOPD）的临床疗效。方法收集2010年7月至2013年6月广东省潮州市湘桥区中医医院呼吸科痰浊积肺型AECOPD患者66例，按随机数字表法将患者随机分为两组各33例，对照组予常规抗生素消炎平喘、止咳治疗，治疗组在对照组治疗基础上加服加味温胆汤。治疗后观察两组患者咳嗽、咳痰、喘憋症状的缓解时间、肺功能变化及临床疗效。结果①两组症状缓解时间比较：治疗后治疗组患者咳嗽、咯痰、喘憋等症状的缓解时间与对照组比较，差异有统计学意义（t值分别为16.770、8.635、16.762，P＜0.05）。②两组临床疗效比较：治疗后治疗组治愈率为63.64%（21/33）、总有效率为96.97%（32/33）；对照组治愈率为39.39%（13/33）、总有效率为90.91%（30/33）。两组治愈率比较差异有统计学意义（χ2＝3.8824，P＜0.05），总有效率比较差异无统计学意义（P＝0.0526）。③两组肺功能变化比较：治疗后，两组FEV1、FVC及FEV1/FVC与同组治疗前比较，差异均有统计学意义[治疗组治疗前分别为（1.41±0.46）L、（2.18±0.63）L、（66.41±6.33）%，治疗后分别为（2.21±0.55）L、（2.83±0.53）L、（77.37±7.64）%；对照组治疗前分别为（1.43±0.43）L、（2.19±0.62）L、（66.52±6.25）%，治疗后分别为（1.86±0.52）L、（2.55±0.57）L、（73.72±6.59）%， P＜0.01]，且治疗组肺功能的改善情况优于对照组（P＜0.05）。结论加味温胆汤配合常规疗法可改善痰浊积肺型AECOPD患者肺功能及咳喘痰多症状。

关键词：慢性阻塞性肺疾病痰浊积肺型加味温胆汤

结直肠癌术后中医证型分布规律及预后因子水平的初步分析

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广州医科大学学报 2014年第4期42卷 62-64页

作者：陈凯生刘铭魏卓红潮州市湘桥区中医医院肝病科广东潮州521000 潮州市人民医院康复科广东潮州510360 潮州市中心医院中医科广东潮州521000

目的:总结结直肠癌患者术后早期中医辨证分型的规律并初步观察预后标志物的表达情况。方法:回顾性分析2009年9月至2013年8月本院收治的174例患者的临床资料,分析其早期中医证候分布情况,观察其预后标志物水平,包括肿瘤TNM分期、肿瘤组... 详细信息

目的:总结结直肠癌患者术后早期中医辨证分型的规律并初步观察预后标志物的表达情况。方法:回顾性分析2009年9月至2013年8月本院收治的174例患者的临床资料,分析其早期中医证候分布情况,观察其预后标志物水平,包括肿瘤TNM分期、肿瘤组织雌激素受体(ER)、抗转移癌基因(nm23)、基质金属蛋白酶-9(MMP-9)、结直肠癌抑癌基因p53、血管内皮生长因子(VEGF)的水平,分析重点证型结直肠癌预后因子的差异,推断常见证型的预后。结果:气血虚衰型、湿瘀毒热型、脾肾阳虚型是最常见的3个证型,其中TNM分期、ER、nm23、p53表达无统计学意义(P>0.05);气血虚衰型的MMP-9、VEGF阳性率最低(P<0.05);湿瘀毒热型的MMP-9、VEGF阳性率最高(P<0.05)。结论:结直肠癌术后早期中医证候以本虚标实、虚实夹杂为主,不同中医证型的结直肠癌患者的预后标志物存在一定差异。

关键词：结直肠癌中医证候调查分析预后因子