首页|通过添加微量Mn元素激活非基面滑移提高镁合金塑性

通过添加微量Mn元素激活非基面滑移提高镁合金塑性

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分析微量锰添加对镁合金显微组织和力学性能的影响.采用电子背散射技术、迹线分析、透射电镜和粘塑性自洽模拟等方法研究变形过程中的塑性变形机理.结果表明:Mn的加入使Mg-Mn合金的平均晶粒尺寸由28.30 μm减小到5.10 μm;同时,随着Mn含量的增加,样品的断裂伸长率由14.33％提高到20.33％,屈服强度则由84 MPa提高到180 MPa.这种同时提高塑性和强度的原因是基面滑移和非基面滑移之间的临界剪切应力差从173 MPa减小到115 MPa,导致非基面滑移活动明显增加.通过微合金元素调整滑移系统差异为开发具有高强度和延展性的镁合金提供了一种途径.
Ductility enhancement by activating non-basal slip in Mg alloys with micro-Mn
The effect of micro-Mn addition on the microstructure and mechanical properties of Mg alloys was analyzed.Electron back scattered diffraction,slip traces analysis,transmission electron microscopy and visco-plastic self-consistent polycrystal constitutive modeling were performed to investigate the deformation mechanisms in the tensile test.The results show that the average grain size of Mg-Mn alloys decreases from 28.30 to 5.10 μm with Mn addition.Furthermore,with the increment of Mn content,the ductility of the as-extruded samples improves from 14.33％to 20.33％,and the yield strength increases from 84 to 180 MPa.The reason for this simultaneous improvement is that the critical resolved shear stress gap between basal slip and non-basal slip decreases from 173 to 115 MPa,which leads to the increase of non-basal slip activity.The adjustment of slip system difference by microalloying elements provides a way to develop Mg alloys with high strength and ductility.

Mg alloymicrostructure evolutionmechanical propertiesductilitydeformation mechanisms

周世博、刘婷婷、汤爱涛、时慧、敬学锐、彭鹏、章建跃、潘复生

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重庆大学材料科学与工程学院,重庆 400044

Institute of Metallic Biomaterials,Helmholtz-Zentrum Hereon,Max-Planck-Straße 1,D-21502,Geesthacht,Germany

西南大学材料与能源学院,重庆 400715

重庆大学镁合金国家工程研究中心,重庆 400044

重庆科技学院冶金和材料工程学院,重庆 401331

Department of Materials Science and Engineering,The Ohio State University,Columbus,OH 43210,USA

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镁合金 显微组织演变 力学性能 塑性 变形机理

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of Chinajoint lab for electron microscopy of Chongqing UniversitySinoma Institute of Materials Research(Guang ZHOU)Co.,Ltd(SIMR)China Scholarship Council

0211002321004351971042U216721351901028202106050089

2024

10.1016/S1003-6326(23)66413-1

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(2)