均匀化退火对Mg-4Zn-4Y合金显微组织和力学性能的影响
Effect of Homogenization Annealing on Microstructure andMechanical Properties of Mg-4Zn-4Y Alloy
摘 要
对铸态Mg-4Zn-4Y合金进行了不同温度（440，460，480℃）和不同保温时间（4~24 h）下的均匀化退火，研究了均匀化退火对合金组织及性能的影响。结果表明：铸态合金中存在α-Mg相、W相Mg3Zn3Y2、LPSO相Mg12ZnY和富钇相；随着退火温度的升高，大部分LPSO相逐渐溶入基体；随着退火保温时间的延长及退火温度的升高，富钇相含量减少，枝晶偏析得到改善；与铸态合金相比，440，460℃均匀化退火后合金的抗拉强度略微降低，断后伸长率变化较小，480℃均匀化退火后抗拉强度和断后伸长率较高，但出现烧损现象。该合金的最佳均匀化退火制度为440℃×12 h。
均匀化退火
显微组织
拉伸性能
Mg-4Zn-4Y alloy
homogenization annealing
microstructure
tensile property
Abstract
As-cast Mg-4Zn-4Y alloy was treated by homogenization annealing at different temperatures (440,460,480℃) for different holding times (4-24 h), and the effects of homogenization annealing on the microstructure and properties of the alloy were studied. The results show that there were α-Mg phase, W phase Mg3Zn3Y2, LPSO phase Mg12ZnY and yttrium-rich phase in the as-cast alloy. With increasing annealing temperature, most of the LPSO phase gradually dissolved into the matrix. With increasing annealing temperature and holding time, the content of yttrium-rich phase decreased, and the dendrite segregation was reduced. Compared with the as-cast alloy, the tensile strength of the alloy after homogenization annealing at 440℃ and 460℃ decreased slightly, and the percentage elongation after fracture changed slightly. The tensile strength and percentage elongation after fracture after homogenization annealing at 480℃ were relatively high, but the burning loss occurred. The best homogenization annealing of the alloy was 440℃×12 h.
中图分类号 TG166.4 DOI 10.11973/jxgccl202301004
所属栏目 试验研究
基金项目 国家自然科学基金资助项目（51864006）；广西高等学校高水平创新团队资助项目（桂教师范[2019]52号）；广西自然科学基金资助项目（2018GXNSFBA281195）；广西科技大学研究生教育创新计划项目（GKYC202110）
收稿日期 2021/5/27
修改稿日期 2022/6/8
网络出版日期
作者单位点击查看
备注翟传田(1995-),男,山东临沂人,硕士研究生
引用该论文: ZHAI Chuantian,SUN Youping,LI Wangzhen,HE Jiangmei,WAN Siyu. Effect of Homogenization Annealing on Microstructure andMechanical Properties of Mg-4Zn-4Y Alloy[J]. Materials for mechancial engineering, 2023, 47(1): 26～33
翟传田,孙有平,李旺珍,何江美,万斯雨. 均匀化退火对Mg-4Zn-4Y合金显微组织和力学性能的影响[J]. 机械工程材料, 2023, 47(1): 26～33
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【8】XU D K, LIU L, XU Y B, et al.The influence of element Y on the mechanical properties of the as-extruded Mg-Zn-Y-Zr alloys[J].Journal of Alloys and Compounds, 2006, 426(1/2):155-161.
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【20】XU D K, TANG W N, LIU L, et al.Effect of W-phase on the mechanical properties of as-cast Mg-Zn-Y-Zr alloys[J].Journal of Alloys and Compounds, 2008, 461(1/2):248-252.
【21】LU R P, WANG J F, CHEN Y L, et al.Effects of heat treatment on the morphology of long-period stacking ordered phase, the corresponding damping capacities and mechanical properties of Mg-Zn-Y alloys[J].Journal of Alloys and Compounds, 2015, 639:541-546.
【22】CHENG P, ZHAO Y H, LU R P, et al.Effect of Ti addition on the microstructure and mechanical properties of cast Mg-Gd-Y-Zn alloys[J].Materials Science and Engineering:A, 2017, 708:482-491.
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