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均匀化和轧制工艺参数对ZK60-1.0Y合金板材组织和力学性能的影响

发表时间:2015-12-15  浏览量:1691  下载量:617
全部作者: 严红革,陈吉华,余海洋,苏斌
作者单位: 湖南大学材料科学与工程学院
摘 要: 采用金相显微镜(optical microscope,OM)、透射电镜(transmission electron microscope,TEM)、拉伸试验和断口分析等手段研究均匀化和轧制工艺参数对ZK60-1.0Y镁合金板材微观组织和力学性能的影响。结果表明,轧制温度为400℃、轧制应变速率为9.1 s-1时,均匀化态ZK60-1.0Y合金轧制板材的综合力学性能最佳,其抗拉强度、屈服强度和伸长率分别为335 MPa,254 MPa和25.5%;其动态再结晶(dynamic recrystallization,DRX)程度随着轧制温度的升高而提高,但再结晶晶粒尺寸逐渐长大;轧制应变速率介于7.1~16.2 s-1时,其再结晶晶粒尺寸随应变速率的增大而减小,但DRX体积分数呈现先增加后下降的趋势。
关 键 词: 有色金属及其合金;镁合金;高应变速率轧制;Mg-Zn-Zr合金;微观组织;力学性能
Title: Effects of homogenization and rolling parameters on microstructure and mechanical properties of ZK60-1.0Y alloy sheet
Author: YAN Hongge, CHEN Jihua, YU Haiyang, SU Bin
Organization: College of Materials Science and Engineering, Hunan University
Abstract: In this paper, the effects of homogenization and rolling parameters on microstructure and mechanical properties of the as-rolled ZK60-1.0Y alloy plates are investigated by optical microscope (OM), transmission electron microscope (TEM), tensile testing and fracture analysis. The results show that the plates prepared by the homogenized ingots with the rolling temperature of 400℃ and the rolling strain rate of 9.1 s-1 exhibit the best combination of mechanical properties, with ultimate tensile strength, yield strength and elongation of 335 MPa, 254 MPa and 25.5%, respectively. The extent of dynamic recrystallization (DRX) increases with the higher rolling temperature, but the DRX grains are coarser. With the rolling strain rate between 7.1 s-1 and 16.2 s-1, the DRX grains become finer and the volume fraction of DRX exhibits an increase at first and then a reduction with the higher rolling strain rate.
Key words: non-ferrous metal and alloy; magnesium alloy; high strain rate rolling; Mg-Zn-Zr alloy; microstructure; mechanical properties
发表期数: 2015年12月第23期
引用格式: 严红革,陈吉华,余海洋,等. 均匀化和轧制工艺参数对ZK60-1.0Y合金板材组织和力学性能的影响[J]. 中国科技论文在线精品论文,2015,8(23):2440-2447.
 
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