GW63K耐热镁合金的力学性能优化

Optimization of Mechanical Properties for GW63K Heat-resistant Mg Alloy

对GW63K镁合金进行不同工艺的T6热处理。结果表明:固溶处理不但可以提高合金的强度,还能使其保持良好的塑性,而时效处理能使T4态GW63K合金的强度进一步提高,但会降低其伸长率。随着T61、T62、T63和T64四种热处理中固溶温度从545℃降低到525℃,GW63K镁合金的强度基本不变,而伸长率得到提高;固溶温度继续从525℃降低到515℃,GW63K镁合金的强度开始下降,而伸长率继续提高。对比后发现,T63态合金的力学性能完全满足技术指标要求,为最佳热处理工艺。

Different processes of T6 heat treatment of GW63K magnesium alloy were carried.The results show that the solution treatment can not only improve the strength of the alloy, but also keep it good plasticity, and aging treatment can make the T4 state GW63K alloy strength further improve, but will weaken the elongation rate. With the T61, T62, T63 and T64 four kinds of heat treatment of solid solution temperatures reducing from 545℃ to 525℃, GW63K magnesium alloy strength is basically unchangeable, while the elongation is improved. When the temperature of solution reduces from 525 ℃ to 515 ℃, GW63K magnesium alloy strength begins to decrease, while the elongation continues to improve. After comparison, it is found that the mechanical properties of T63 state alloy completely meet the technical requirements, which is the best heat trea-tment process.