La/Nd比对AZ91-RE合金显微组织和拉伸性能的影响  

Effect of La/Nd ratio on microstructure and tensile properties of AZ91-RE alloys

作　　者：崔鹏星 胡茂良[1,2] 吉泽升 王晔[1,2] 郭宇 许红雨[1,2] Peng-xing CUI;Mao-liang HU;Ze-sheng JI;Ye WANG;Yu GUO;Hong-yu XU(School of Materials Science and Chemical Engineering,Harbin University of Science and Technology,Harbin 150080,China;Key Laboratory of Advanced Manufacturing and Intelligent Technology,Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China;School of Intelligent Manufacturing,Huzhou College,Huzhou 313000,China)

机构地区：[1]哈尔滨理工大学材料科学与化学工程学院,哈尔滨150080 [2]哈尔滨理工大学先进制造智能化技术教育部重点实验室,哈尔滨150080 [3]湖州学院智能制造学院,湖州313000

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第5期1456-1469,共14页中国有色金属学报（英文版）

基　　金：National Key Research and Development Program of China(No.2019YFB2006500);National Natural Science Foundation of China(Nos.51574100,51704087);Natural Science Foundation of Heilongjiang Province,China(No.LH2020E083)。

摘　　要：研究La/Nd比对AZ91-RE合金显微组织和拉伸性能的影响。采用经典表征方法分析第二相的体积分数、平均最近邻距离(NND)和数量密度。利用第一性原理计算确定第二相的形成焓、力学性能和热力学性质。结果表明,La与Nd的质量分数比(w_(La)/w_(Nd))为3/2的合金具有最小的平均晶粒尺寸、最小的平均最近邻距离和最高的第二相数量密度。计算结果表明,Al_(11)La_(3)和Al2Nd的形成在能量上有利。此外,Al_(11)La_(3)和Al_(2)La在抗变形能力、抗剪切变形能力、固体刚度和热稳定性方面都明显优于其他第二相。因此,提高Al_(11)La_(3)和Al_(2)La相的含量有利于改善AZ91-RE合金的力学性能。The effect of La/Nd ratio on the microstructure and tensile properties of AZ91-RE alloys was studied.Typical characterization was performed to analyze the volume fraction,mean nearest neighbor distance(NND),and number density of the secondary phases.First-principles calculations were employed to determine the formation enthalpy,mechanical and thermodynamics properties of the secondary phases.The results demonstrate that the alloy with a mass fraction ratio of La to Nd(w_(La)/w_(Nd))of 3꞉2 exhibits the finest average grain size,the smallest mean NND,and the highest total number density of secondary phases.The calculations indicate that the formation of Al_(11)La_(3) and Al2Nd is energetically favorable.Furthermore,Al_(11)La_(3) and Al_(2)La display significantly superior deformation resistance,shear deformation resistance,solid stiffness and thermal stability compared to other secondary phases.Therefore,increasing the content of Al_(11)La_(3) and Al_(2)La phases contributes to improving the mechanical properties of AZ91-RE alloy.

关 键 词：AZ91合金 显微组织 拉伸性能 第一性原理计算 电子结构 热力学性质 

分 类 号：TG146.21[一般工业技术—材料科学与工程]