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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 temperature and extrusion rate on the microstructure and properties of Mg-8Gd-3Y-Nd-0.5Zr alloy were investigated by tensile test, microstructure observation and SEM scanning. The results show that the as-cast alloy is rich in a large amount of pseudo-eutectic structure and Gd, Y, Nd segregation phase; after homogenization treatment, the eutectic structure is basically decomposed; dynamic recrystallization of the alloy occurs after 480 ℃ Tensile strength, hardness reached the highest value of 322 MPa, 98.4 HB; alloy temperature below 460 ° C plastic deformation, easy to crack.