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冲击加载下FeMnNi合金相变和层裂特性实验研究

DOI: 10.11858/gywlxb.2010.02.005, PP. 107-112

Keywords: FeMnNi合金,相变,逆相变,层裂,稀疏冲击波

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Abstract:

采用激光速度干涉仪(VISAR)、X射线衍射(XRD)和扫描电镜(SEM)联合测试技术,利用等厚对称加载和逆向加载实验,研究了FeMnNi合金的冲击相变和层裂行为。结果发现:加载压力大于6.5GPa时,FeMnNi合金样品发生α→ε相变;中心稀疏波的卸载作用使内压力降至4~5GPa时,FeMnNi合金样品发生ε→α逆相变,并伴有卸载稀疏冲击波形成。分析FeMnNi合金样品中塑性波、相变波、稀疏波和稀疏冲击波的传播作用过程,发现加载压力大于其相变应力时,等厚对称加载下FeMnNi合金存在产生层裂行为的物理机制。

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