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Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 388-388页

作者： Li Hu Mingao Li Qiang Chen Tao Zhou laixin shi Mingbo Yang College of Material Science and Engineering Chongqing University of TechnologyChongqing400054China Southwest Technology and Engineering Research Institute Chongqing400039China

In the originally published PDF version of the article,a reference citation[34]has been omitted in the caption of Fig.6.The added reference No.34 is“L.Hu,H.Lv,L.shi,Y.Chen,Q.Chen,T.Zhou,M.Li,M.Yang,J.Magnes.Alloy.10,... 详细信息

关键词： Microstructure Alloy AZ31

Dependence of Microstructure Evolution and Mechanical Properties on Loading Direction for AZ31 Magnesium Alloy Sheet with Non-basal Texture During In-Plane Uniaxial Tension

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Acta Metallurgica Sinica(English Letters) 2022年第2期35卷 223-234页

作者： Li Hu Mingao Li Qiang Chen Tao Zhou laixin shi Mingbo Yang College of Material Science and Engineering Chongqing University of TechnologyChongqing 400054China Southwest Technology and Engineering Research Institute Chongqing 400039China

In-plane uniaxial tension of AZ31 magnesium alloy sheet with non-basal texture has been conducted in order to demonstrate the effects of loading direction on the microstructure evolution and mechanical properties at ambient temperature.Loading axes are chosen to be along five directions distributed between rolling direction(RD)and transverse direction(TD),allowing various activities in involved slip and twinning modes to take place.As for twinning modes,electron backscattered diffraction observations confirm that the contribution of{1011}compression twinning is minimal to the plastic deformation of all deformed samples.By comparison,{1012}extension twinning(ET)not only serves as an important carrier on sustaining and accommodating plastic strain but also contributes to the emergence of TD-component texture with the progression of plastic strain.In terms of slip modes,analysis on Schmid factor demonstrates that the increasing tilted angle between loading direction and RD of sheet is unfavorable to the activation of basalslip,whereas it contributes to the activation of prismaticslip.These observations consequently explain the increasing tendency of 0.2%proof yield stress.Moreover,the activations of basalslip and{1012}ET collectively contribute to the concentration of two tilted basal poles toward normal direction.With increasing angle between loading direction and RD,the activations of basalslip and{1012}ET are gradually weakened.This leads to a weakening tendency about concentration of two tilted basal poles,a generally increasing tendency about Lankford value(r-value)and a generally decreasing tendency about strain-hardening exponent(n-value).

关键词： AZ31 magnesium alloy Non-basal texture Plastic deformation Microstructure evolution

Study on hot deformation behavior of homogenized Mg-8.5Gd-4.5Y-0.8Zn-0.4Zr alloy using a combination of strain-compensated Arrhenius constitutive model and finite element simulation method

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Journal of Magnesium and Alloys 2023年第3期11卷 1016-1028页

作者： Li Hu Mengwei Lang laixin shi Mingao Li Tao Zhou Chengli Bao Mingbo Yang College of Material Science and Engineering Chongqing University of TechnologyChongqing 400054China

Isothermal hot compression experiments were conducted on homogenized Mg-8.5Gd-4.5Y-0.8Zn-0.4Zr alloy to investigate hot deformation behavior at the temperature range of 673-773 K and the strain rate range of 0.001-1 s^(-1)by using a Gleeble-1500D thermo mechanical simulator.Metallographic characterization on samples deformed to true strain of 0.70 illustrates the occurrence of flow localization and/or microcrack at deformation conditions of 673 K/0.01 s^(-1),673 K/1 s^(-1)and 698 K/1 s^(-1),indicating that these three deformation conditions should be excluded during hot working of homogenized Mg-8.5Gd-4.5Y-0.8Zn-0.4Zr alloy.Based on the measured true stress-strain data,the strain-compensated Arrhenius constitutive model was constructed and then incorporated into UHARD subroutine of ABAQUS software to study hot deformation process of homogenized Mg-8.5Gd-4.5Y-0.8Zn-0.4Zr alloy.By comparison with measured force-displacement curves,the predicted results can describe well the rheological behavior of homogenized Mg-8.5Gd-4.5Y-0.8Zn-0.4Zr alloy,verifying the validity of finite element simulation of hot compression process with this complicated constitutive model.Numerical results demonstrate that the distribution of values of material parameters(α,n,Q and ln A)within deformed sample is inhomogeneous.This issue is directly correlated to the uneven distribution of equivalent plastic strain due to the friction effect.Moreover,at a given temperature the increase of strain rate would result in the decrease of equivalent plastic strain within the central region of deformed sample,which hinders the occurrence of dynamic recrystallization(DRX).

关键词： Mg-RE-Zn alloy Hot deformation Microstructure evolution Constitutive model Finite element simulation

Research on deformation mechanism of AZ31 magnesium alloy sheet with non-basal texture during uniaxial tension at room temperature:A visco-plastic self-consistent analysis

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Journal of Magnesium and Alloys 2022年第7期10卷 1994-2008页

作者： Li Hu Huyuan Lv laixin shi Yu Chen Qiang Chen Tao Zhou Mingao Li Mingbo Yang College of Material Science and Engineering Chongqing University of TechnologyChongqing 400054China Southwest Technology and Engineering Research Institute Chongqing 400039China

The relationship between activities of involved deformation mechanisms and the evolution of microstructure and texture during uniaxial tension of AZ31 magnesium alloy with a rare non-basal texture has been thoroughly investigated in the present study by means of electron backscattered diffraction(EBSD) measurement and visco-plastic self-consistent(VPSC) modeling. These results show that except basal slip and prismatic slip, {10■2} extension twin(ET) also plays a significant role during plastic deformation. With the increasing tilted angle between loading direction and rolling direction(RD) of sheet, the activity of {10■2} ET possesses a decreasing tendency and its role in plastic deformation changes from the one mainly sustaining plastic strain to the one mainly accommodating local strain between individual grains. When {10■2} ET serves as a carrier of plastic strain, it mainly results in the formation of basal texture component(c-axis//ND, normal direction). By comparison, when the role of {10■2} ET is to accommodate local strain, it mainly brings about the formation of prismatic texture component(c-axis//TD, transverse direction). At large plastic deformation, the competition between basal slip and pyramidal slip is responsible for the concentration of tilted basal poles towards ND within all deformed samples. The larger difference is between the activities of basal slip and pyramidal slip, the smaller separation is between these two tilted basal poles. Besides,VPSC modeling overesttmates volume fractions of {10■2} ET in samples with angle of 0 to 30° between loading direction and RD of sheet because interactions between twin variants are not included in VPSC modeling procedure at the present form. In addition, as compatible deformation between individual grains cannot be considered in VPSC modeling, the predicted volume fractions of {10■2} ET in samples with angle of 45 to 90° between loading direction and RD of sheet are smaller than the correspondingly measured results.

关键词： AZ31 magnesium alloy Non-basal texture Plastic deformation VPSC

Influence of bimodal non-basal texture on microstructure characteristics,texture evolution and deformation mechanisms of AZ31 magnesium alloy sheet rolled at liquid-nitrogen temperature

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镁合金学报(英文) 2023年第7期11卷 2600-2609页

作者： Shouzuo Zhang Li Hu Yutao Ruan Tao Zhou Qiang Chen Yang Zhong laixin shi Mingao Li Mingbo Yang Shuyong Jiang College of Material Science and Engineering Chongqing University of TechnologyChongqing 400054China Southwest Technology and Engineering Research Institute Chongqing 400039China School of Advanced Manufacturing Technologies Tomsk Polytechnic UniversityTomsk 634050Russia College of Material Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Cryogenic rolling experiments have been conducted on the AZ31 magnesium(Mg)alloy sheet with bimodal non-basal texture,which is fabricated via the newly developed equal channel angular rolling and continuous bending process with subsequent annealing(ECAR-CB-A)process.Results demonstrate that this sheet shows no edge cracks until the accumulated thickness reduction reaches about 18.5%,which is about 105.6%larger than that of the sheet with traditional basal texture.Characterization experiments including optical microstructure(OM),X-ray diffractometer(XRD),and electron backscatter diffraction(EBSD)measurements are then performed to explore the microstructure characteristics,texture evolution and deformation mechanisms during cryogenic rolling.Experimental observations confirm the occurrence of abundant{10–12}extension twins(ETs),twin-twin interactions among{10–12}ET variants and{10–12}-{10–12}double twins(DTs).The twinning behaviors as for{10–12}ETs are responsible for the concentration of c-axes of grains towards normal direction(ND)and the formation of transverse direction(TD)-component texture at the beginning of cryogenic rolling.The twinning behaviors with respect to{10–12}-{10–12}DTs are responsible for the disappearance of TD-component texture at the later stage of cryogenic rolling.The involved deformation mechanisms can be summarized as follows:Firstly{10–12}ETs dominate the plastic deformation.Subsequently,dislocation slip,especially basalslip,starts to sustain more plastic strain,while{10–12}ETs occur more frequently and enlarge continuously,resulting in the formation of twin-twin interaction among{10–12}ET variants.With the increasing rolling passes,{10–12}-{10–12}DTs incorporate in the plastic deformation and dislocation slip serves as the major one to sustain plastic strain.The activities of basalslip,{10–12}ETs and{10–12}-{10–12}DTs benefit in accommodating the plastic strain in sheet thickness,which contributes to the improved rolling formability in AZ31 Mg alloy sheet with bimodal non-basal te

关键词： AZ31 Mg alloy Bimodal non-basal texture Cryogenic rolling Microstructure evolution Deformation mechanism

热疲劳试验后K465合金低压涡轮叶片的组织及性能

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特种铸造及有色合金 2022年第7期42卷 921-924页

作者：周中波杨明波张建中时来鑫重庆理工大学材料科学与工程学院重庆400054 重庆三耐科技有限责任公司

对某航空发动机K465合金低压涡轮叶片在900℃及950℃进行100次冷热循环试验,研究了叶片在热疲劳试验过程中的裂纹萌生及扩展,分析了热疲劳试验后叶片的微观组织及力学性能。结果表明,热疲劳裂纹首先从叶片工艺孔处萌生,垂直于叶片轴向... 详细信息

对某航空发动机K465合金低压涡轮叶片在900℃及950℃进行100次冷热循环试验,研究了叶片在热疲劳试验过程中的裂纹萌生及扩展,分析了热疲劳试验后叶片的微观组织及力学性能。结果表明,热疲劳裂纹首先从叶片工艺孔处萌生,垂直于叶片轴向方向扩展,工艺孔及缩松处的应力集中是热疲劳裂纹萌生的主要原因;冷热循环试验后枝晶干γ′相尺寸增大,立方形态γ′相边角变得圆滑不规则,且由于针状二次析出相的析出,叶片的伸长率大幅下降。

关键词： K465合金热疲劳裂纹组织性能

注射速度对粉末注射成形Fe-4Ni合金组织性能影响

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特种铸造及有色合金 2023年第3期43卷 379-384页

作者：屈亚龙李明骜周涛胡励时来鑫高茉野陈元芳杨明波重庆理工大学材料科学与工程学院

利用光学显微镜、扫描电镜和拉伸试验机等研究了注射速度和热处理对Fe-4Ni合金显微组织及力学性能的影响。结果表明,当注射速度为40 mm/s时,合金力学性能和致密度较好,屈服强度为785.8 MPa、抗拉强度为1029.6 MPa、致密度为96.02%。同时... 详细信息

利用光学显微镜、扫描电镜和拉伸试验机等研究了注射速度和热处理对Fe-4Ni合金显微组织及力学性能的影响。结果表明,当注射速度为40 mm/s时,合金力学性能和致密度较好,屈服强度为785.8 MPa、抗拉强度为1029.6 MPa、致密度为96.02%。同时,经热处理后合金硬度(HRC)和抗拉强度显著提升,分别为42和1206.4 MPa。此外,缺陷会造成合金内部形成河流状组织,导致材料发生局部区域脆性断裂。

关键词： Fe-4Ni合金金属粉末注射成型(MIM) 热处理注射速度

退火工艺对高温叠轧AZ31镁合金板材组织与性能的影响

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锻压技术 2020年第3期45卷 179-184页

作者：廖本洪时来鑫胡励宋登辉周涛重庆理工大学材料科学与工程学院重庆400054

将高温叠轧变形和退火再结晶相结合,尝试共同调控AZ31镁合金板材的组织与织构。在300℃下对高温叠轧AZ31镁合金板材进行不同时间的退火处理,并研究了退火对高温叠轧板材组织、晶粒取向和力学性能的影响。结果表明:随退火时间的增加,界... 详细信息

将高温叠轧变形和退火再结晶相结合,尝试共同调控AZ31镁合金板材的组织与织构。在300℃下对高温叠轧AZ31镁合金板材进行不同时间的退火处理,并研究了退火对高温叠轧板材组织、晶粒取向和力学性能的影响。结果表明:随退火时间的增加,界面结合质量逐渐提高,当退火时间为30 min时,部分区域出现冶金现象;显微硬度随退火时间的增加而降低;延长退火时间,高温叠轧板材非基面取向晶粒比重显著增加,同时,高温叠轧历史累积应变量、后续退火两者共同作用促使AZ31镁合金板材基面织构显著弱化。

关键词：高温叠轧 AZ31镁合金退火累积应变量基面织构

Mg-Li合金塑性加工方法的研究现状及展望

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热加工工艺 2021年第13期50卷 1-6页

作者：章懿清时来鑫胡励周涛杨明波重庆理工大学材料科学与工程学院重庆400054 重庆理工大学重庆市模具技术重点实验室重庆400054

锂元素的加入使镁合金的结构发生了变化,也使其变形能力得到提升。本文分析了Mg-Li合金的特点以及其存在的不足,综述了近年来Mg-Li合金挤压、轧制、锻造的塑性加工研究成果。最后展望了Mg-Li合金塑性加工的未来发展。

关键词： Mg-Li合金塑性加工微观组织 α-Mg相 β-Li相

芯棒根数对Mg MB26/Al 7075双金属包覆挤压棒材组织及性能的影响

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有色金属工程 2019年第6期9卷 6-11页

作者：高鹏胡兴张蕊周涛涂坚时来鑫胡励陈强重庆理工大学材料科学与工程学院重庆400054 重庆市模具工程技术研究中心重庆400054 重庆市模具重点实验室重庆400054 西南技术工程研究所重庆400039

利用包覆挤压方法成功制备了不同芯棒根数(一根、三根、五根)的MgMB26/Al7075双金属复合棒材。重点研究了不同芯部根数对Mg/Al双金属复合材料的微观组织及界面质量的影响,同时对不同芯棒根数Mg/Al复合材料的力学性能进行了分析对比。结... 详细信息

利用包覆挤压方法成功制备了不同芯棒根数(一根、三根、五根)的MgMB26/Al7075双金属复合棒材。重点研究了不同芯部根数对Mg/Al双金属复合材料的微观组织及界面质量的影响,同时对不同芯棒根数Mg/Al复合材料的力学性能进行了分析对比。结果表明,采用320℃挤压温度、25的挤压比制备的不同芯棒根数Mg/Al复合棒材,五芯芯部、边部晶粒细化及均匀化程度较三芯效果更佳,即多芯结构界面表面积这一因素对晶粒细化及均匀度的影响较完全轴对称这一力学因素影响更加明显。随着蕊棒数目的增加,界面层厚度略有减小且近镁层厚度减小较为明显;屈服强度变化差距不大、有轻微的增大趋势。

关键词：芯棒根数 Mg/Al双金属包覆挤压显微组织界面质量