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冲击波加载技术可以对材料产生瞬时高温、高压和高应变率等极端作用,对于研究其物理、化学性能都是不可或缺的重要手段。本实验使用一级轻气炮加载,以不同冲击速度的飞片对Ti-6Al-4V合金进行气炮冲击,利用X射线衍射、扫描电镜等多种测试方法进行表征,研究冲击波手段对Ti-6Al-4V合金层裂和晶相的影响,并初步分析出Ti-6Al-4V合金冲击损伤和冲击相变的机制。经过对不同冲击速度的样品研究和分析后发现,样品中出现微损伤,经历了成核、长大、连接等过程,在冲击应力达到一定程度时发生了层裂;通过冲击作用后样品的结晶程度更加完好,晶面生长更加完整;另外,冲击样品发生了从α,β相到α′相的晶相转变,α’相是一种韧性相,从而在一定程度上提高了Ti-6Al-4V合金的冲击韧度。
Shock wave loading technology can produce extreme high temperature, high pressure and high strain rate on the material. It is an indispensable means to study its physical and chemical properties. In this experiment, a light gas cannon was used to load the Ti-6Al-4V alloy with different impact velocities. The gas impact was measured by X-ray diffraction and scanning electron microscopy. The effect of shock wave on Ti- 6Al-4V alloy layer cracking and the crystal phase, and preliminary analysis of Ti-6Al-4V alloy impact damage and impact phase transition mechanism. After the study and analysis of the samples with different impact velocities, it was found that micro-damage occurred in the sample and experienced nucleation, growth and connection, and the delamination occurred when the impact stress reached a certain level. The crystallization of the sample In addition, the crystal phase transition from α, β phase to α ’phase took place in the impact sample, α’ phase is a tough phase, so that the Ti-6Al- 4V alloy impact toughness.