FeMnNi合金冲击相变与卸载逆相变历程研究  

Phase Transition and Reverse Transition in FeMnNi Alloy

作　　者：陈永涛[1] 李庆忠[1] 唐小军[1] 刘文韬[2] 

机构地区：[1]中国工程物理研究院流体物理研究所,冲击波物理与爆轰波物理国防科技重点实验室,四川绵阳621900 [2]北京应用物理与计算数学研究所,北京100094

出　　处：《高压物理学报》2011年第2期153-158,共6页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(10902102);中国工程物理研究院科学技术基金(2009B0201014)

摘　　要：采用VISAR测试技术,将正向加载和逆向加载实验相结合,研究了不同加载压力下FeMnNi合金的冲击相变和卸载逆相变历程。结果表明:冲击加载压力与冲击相变阈值之差小于逆相变阈值时,即0<pσ-tσ<σn,FeMnNi合金发生α→ε相变,加载段呈现弹性波、塑性波和相变波三波结构,塑性波在自由面反射稀疏波使FeMnNi合金完成ε→α逆相变,卸载段呈现稀疏波、稀疏冲击波和稀疏波三波结构;pσ-tσ>nσ时,加载段呈现弹性波、塑性波、相变波和相界面反射压缩波的四波结构,卸载过程中相变波反射稀疏波使FeMnNi合金完成ε→α逆相变,卸载段呈现稀疏波和稀疏冲击波的两波结构。By means of VISAR,the phase transition and reverse phase transition in FeMnNi alloy under different pressures were studied through direct impact and reverse impact experiments.As the difference between shock pressure and phase transition threshold is larger than reverse transition threshold,namely 0σp-σt σn,it may lead to an occurrence of the α →ε phase transition in FeMnNi alloy,and produces a multi-wave structure consisting of an elastic wave,a plastic wave and a phase transition wave.Under the release process,the rarefaction wave reflecting by the plastic wave from the free surface induces the complete reverse phase transition ε →α,and forms a multi-wave structure comprising a rarefaction wave,a rarefaction shock wave and another rarefaction wave.As σp-σtσn,it may produce a multi-wave structure with phase interface reflection（PIR） wave.During the release process,the rarefaction wave reflecting by the residual phase wave causes the reverse phase transition ε →α,and forms a two-wave structure consisting of a rarefaction wave and a rarefaction shock wave.

关 键 词：固体力学 FeMnNi 相变 逆相变 

分 类 号：O347.4[理学—固体力学]