Mn含量对Mg-1Al合金微观组织和变形机制的影响
Effect of Mn content on microstructure and deformation mechanism of Mg-1Al alloy
彭怡 1张丹 1颜宏伟 1彭鹏 1龙帅 1张诚 1杨青山 1戴庆伟1
作者信息
- 1. 重庆科技学院冶金与材料工程学院,重庆 401331
- 折叠
摘要
采用拉伸实验、扫描电镜、电子背散射衍射技术和粘塑性自洽(VPSC)模拟计算等方法分析了不同Mn含量对挤压Mg-1Al-xMn(x=1、2和3,mass％)合金微观组织和塑性变形机制的影响.结果表明:随着Mn含量从1 mass％增加至3 mass％,Mg-1Al挤压合金的强度和塑性得到同步提升,其中Mg-3Mn-1Al合金的力学性能表现良好,拉伸屈服强度、极限拉伸强度和断裂伸长率分别为302 MPa、325 MPa和21％.随着Mn含量的增加,Mg-1Al挤压合金中的第二相数量显著增加,且沿着挤压方向呈带状分布,Mg-3Mn-1Al合金的晶粒最细小,出现明显的混晶组织,平均晶粒尺寸为1.31 μm.VPSC模拟结果表明,在Mg-1Al合金中加入Mn元素可以有效抑制基面<a>滑移的启动,有利于促进锥面<c+a>滑移系的激活,非基面滑移的启动能够有效协调应变,进而提升合金的塑性变形能力,最终实现强度和塑性的同步提升.
Abstract
Effect of different Mn contents on microstructure and plastic deformation mechanism of extruded Mg-1Al-xMn(x=1,2 and 3,mass％)alloy was analyzed by means of tensile test,scanning electron microscopy,electron backscatter diffraction technique and viscoplastic self-consistent(VPSC)simulation calculations.The results show that as the Mn content increases from 1 mass％to 3 mass％,the strength and plasticity of the extruded Mg-1Al alloy are synchronously improved.Among them,the Mg-3Mn-1Al alloy exhibits good mechanical properties,with tensile yield strength,ultimate tensile strength and elongation of 302 MPa,325 MPa and 21％respectively.With the increase of Mn content,the number of the second phase in the extruded Mg-1Al alloy significantly increases,and it is distributed in a strip shape along the extrusion direction.The grain size of the Mg-3Mn-1Al alloy is the smallest,with obvious mixed crystal structure,and the average grain size is 1.31 μm.The VPSC simulation results show that adding Mn element to the Mg-1Al alloy can effectively suppress the initiation of basal<a>slip,which is beneficial for promoting the activation of pyramid<c+a>slip system.The initiation of non basal slip can effectively coordinate strain,thereby improving the plastic deformation ability of the alloy,and ultimately achieving synchronous improvement of strength and plasticity.
关键词
镁合金/晶粒组织/变形机制Key words
magnesium alloy/grain structure/deformation mechanism引用本文复制引用
基金项目
国家自然科学基金青年基金(52301133)
重庆市教委科学技术研究项目(KJQN202101523)
重庆市自然科学基金面上项目(cstc2021jcyjmsxmX0814)
重庆科技学院科研启动项目(ckrc2020016)
出版年
2024
NETL
NSTL
维普
万方数据