摘要
The impact of multi-directional compression passes on the microstructure,mechanical properties,and corrosion behavior of ZK60 magnesium alloy was investigated.Results reveal that severe dendrite segregation exists in the as-cast ZK60 magnesium alloy with coarse MgZn phases distributed along the grain boundaries.After 9 passes of compression,the coarse solidified phases at the grain boundary are significantly refined,and back dissolution occurs.Fine recrystallized grains accompanied with the fine diffused nano-phases emerge in the local area around the large grains.The tensile strength of ZK60 magnesium alloy generally exhibits the upward trend with the increase in compression passes,whereas the compression rate shows the downward trend.The compressive strength reaches 433.6 MPa with the compression rate of 21.3%after 9 passes of compression.Multi-directional compression can significantly reduce the degradation rate of ZK60 magnesium alloy in simulated body fluids.Furthermore,it is observed that in the ascast ZK60 magnesium alloy,micro-segregation can easily lead to severe intragranular local corrosion.However,after multidirectional compression,the tendency to intragranular local corrosion is significantly diminished.
研究了多向压缩道次对ZK60镁合金组织、力学性能和腐蚀行为的影响。结果表明,铸态ZK60镁合金枝晶偏析较为严重,晶界处分布着粗大的MgZn相。当压缩道次增加到9道次时,晶界处的粗大凝固相显著细化,并发生回溶,大晶粒周围的局部区域出现细小的再结晶晶粒,并在再结晶晶粒周围析出细小弥散的纳米相。随着压缩道次的增加,ZK60镁合金的抗拉伸强度总体呈上升趋势,压缩率呈下降趋势,9道次时抗压强度为433.6 MPa,压缩率为21.3%。多向压缩可显著降低ZK60镁合金在模拟体液中的降解率,对于铸态ZK60镁合金,微观偏析容易导致严重的晶内局部腐蚀,但是经过多向压缩后,晶内局部腐蚀倾向明显减弱。
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2024年第12期3338-3347,共10页
Rare Metal Materials and Engineering
基金
Guangdong Ocean University Research Launch Project(060302062310)。
