中北大学学报（自然科学版）2018，Vol.39Issue(2)：241-246,6.DOI:10.3969/j.issn.1673-3193.2018.02.023
降温往复镦粗-挤压对Mg-Gd-Y-Zn-Zr合金微观组织的影响
Effect of Repetive Upsetting-extrusion Under Decreasing Temperature Conditionson Microstructure of Mg-Gd-Y-Zn-Zr Alloy
杜玥 1张治民 1张冠世 1闫钊鸣1
作者信息
- 1. 中北大学 材料科学与工程学院,山西 太原030051
- 折叠
摘要
Abstract
A repetitive upsetting-extrusion (RUE)process was carried out on the Mg-12.5Gd-4Y-2Zn-0.5Zr alloy up to 5 passes (i.e.,accumulative strains of 6.75)with decreasing temperature pass-by-pass from 480 ℃ to 390 ℃.The microstructure evolution of the alloys during RUE was investigated by using OM、SEM and XRD.The results show that the RUE process is effective in refining the grains of Mg-12.5Gd-4Y-2Zn-0.5Zr alloy.The grain refinement is mainly occurred at early passes,and the refinement efficiency is gradually weakened with further increasing passes.After 5 RUE passes,the average grain size is decreased from 64.2 μm to 4.4 μm,and a uniform fully recrystallized structure is achieved.In ad-dition,with increasing number of RUE passes,the lamellar LPSO structures inside the original grains gradually dissolve and numerous tiny particleβ-Mg5(Gd,Y,Zn)phases are dynamically precipitated a-long dynamically recrystallized grain boundaries.Meanwhile,the block-shaped LPSO phases discontinu-ously distributing along initial grain boundaries as network structure are kinked severely,and gradually fragmented into smaller ones uniformly distributed along extrusion direction.关键词
大塑性变形/往复镦粗-挤压/降温变形/Mg-Gd-Y-Zn-Zr合金Key words
severe plastic deformation/repetitive upsetting-extrusion (RUE)/decreasing temperature condition/Mg-Gd-Y-Zn-Zr alloy分类
矿业与冶金引用本文复制引用
杜玥,张治民,张冠世,闫钊鸣..降温往复镦粗-挤压对Mg-Gd-Y-Zn-Zr合金微观组织的影响[J].中北大学学报（自然科学版）,2018,39(2):241-246,6.
