摘要
采用显微组织观察、拉伸性能测试、断口形貌观察等方法研究了540℃不同保温时间的固溶处理对Mg-4Y-2.5Nd-1.0Gd-0.5Zr合金组织和力学性能的影响。结果表明:铸态试验合金组织主要由α-Mg基体、短条状的Mg-Y-Nd相及少量颗粒状的Mg_(24)Y_(5)相组成。经540℃×4 h固溶处理的试验合金,晶界处的Mg-Y-Nd相基本溶入基体,晶内Mg_(24)Y_(5)相也明显减少。随着固溶时间再继续延长,第二相无明显变化。随着固溶时间的延长,合金的抗拉强度和伸长率均先升高后降低,经540℃×4 h固溶合金的抗拉强度和伸长率均达到最大值。540℃×4 h为Mg-4Y-2.5Nd-1.0Gd-0.5Zr合金的最佳固溶工艺。
The effects of solution treatment at 540℃for different holding time on the microstructure and mechanical properties of Mg-4Y-2.5Nd-1.0Gd-0.5Zr alloy were studied by means of microstructure observation,tensile property test and fracture morphology observation.The results show that the microstructure of cast test alloy is mainly composed ofα-Mg matrix,short strip Mg-Y-Nd phase and a small amount of granular Mg_(24)Y_(5)phase.After 540℃×4 h solid solution treatment,the Mg-Y-Nd phase at the grain boundary basically dissolves into the matrix.The Mg_(24)Y_(5)phase in the crystal also is markedly reduced.The second phase does not change significantly as the solution time continues.With the increase of solution time,the tensile strength and elongation of the alloy increase first and then decrease,and the tensile strength and elongation of 540℃×4 h solid solution alloy reach the maximum value.540℃×4 h is the best solution process for Mg-4Y-2.5Nd-1.0 Gd-0.5Zr alloy.
作者
付靖
FU Jing(School of Mechanical Engineering,He'nan Institute of Technology,Xinxiang 453003,China)
出处
《热加工工艺》
北大核心
2021年第20期119-121,共3页
Hot Working Technology
基金
河南省科技攻关项目(202102210282)。
