Mg-3Al-6Zn-2Y合金的动态压缩性能研究

Research on the Properties of Mg-3Al-6Zn-2Y Alloy under Dynamic Compression

摘要:

在0.001、900、1300 s-1 3个应变率下，研究了Mg-3Al-6Zn-2Y合金的压缩性能及微细观变化。结果表明：随应变率增大，合金应变硬化率增大，极限强度与屈服强度增大；强化相Al2Y、Al12Mg17与过渡相MgZn2含量减少；合金产生{102}<100>孪生，位错密度增大，出现缠结，并在孪生界面塞集。强化相减少对强度的弱化作用与高密度位错塞集的强化作用相互竞争。

Abstract:

The compressive property and microstructure of Mg-3Al-6Zn-2Y alloy at the strain rates of 0.001, 900, 1300 s-1 were studied. The hardening rate, ultimate strength, and yield strength increased with strain rate increasing, while the reinforcement phases of Al2Y and Al12Mg17 and the transition phase MgZn2 decreased. The {102}<100> twinning occurred with higher density of dislocation which tangled and piled up on the interface of crystal twin. The weakening effect on intensity caused by decreasing of reinforcement phases competes with the intensifying effect caused by the higher density of dislocation piling up on the interface of crystal twin.