镁铝合金的冲击熔化行为实验研究

Melting of MB2 Alloy under Shock Compression

采用反向碰撞实验技术,结合具有高时空分辨率的全光纤激光干涉测速技术,对镁铝合金开展了极端动态压缩条件下的动力学行为实验研究,获得了镁铝合金在30～73 GPa压力范围内的Hugoniot和声速实验数据。深入的数据分析表明,所获得的Hugoniot数据与早期的Hugoniot数据一致,但是纵波声速却呈现出明显的向体波声速转变的趋势,对应冲击加载下镁铝合金的固-液熔化相变,相变压力区间为40～57 GPa。

Reverse impact experiments were performed at a shock pressure range from 30 GPa to 73 GPa to investigate the dynamic response of magnesium aluminum alloy. A displacement interferometer system for any reflector was employed to measure the impact velocity and sample/window interface particle velocities. The Hugoniot data obtained in this study had a good agreement with the data published before, however, the sound velocities extracted from our experiments showed a transition from longitudinal to bulk sound velocity. This discontinuity is attributed to melting transition under shock compression, and the transition pressure range is estimated from 40 GPa to 57 GPa.