摘要
采用拉伸、金相组织观察、SEM扫描研究了不同挤压温度及挤压速率对Mg-8Gd-3Y-Nd-0.5Zr合金组织和性能的影响。结果表明,铸态合金中富集大量伪共晶组织及Gd、Y、Nd的偏析相;经过均匀化处理后,共晶组织基本分解;挤压后合金发生明显的动态再结晶,在480℃抗拉强度、硬度分别达到最高值322 MPa、98.4 HB;合金低于460℃的温度塑性变形,容易开裂。
The effects of different extrusion temperatures and strain rates on the microstructure and mechanical properties of Mg-8Gd-3Y-1Nd-0.5Zr alloy were investigated by tensile test, microstructure observation and SEM scanning. The results show that, the as-cast alloys enrich a lot oflbseudo-eutectic and Gd, Y, Nd segregative phase; after homogenization treatment, the pseudo structure is mainly resolved; dynamic recrystallization occurs after hot extrusion, and the tensile strength and hardness of alloys at 480℃ reach 322MPa and 98.4HB, respectively; plastic deformation below 460℃ can easily cause fracture of the alloy.
出处
《热加工工艺》
CSCD
北大核心
2014年第9期33-35,39,共4页
Hot Working Technology
