冲击加载下FeMnNi合金相变和层裂特性实验研究(英文)  

Experimental Study on Phase Transition and Spall Fracture in FeMnNi Alloy under Shock Pressure

作　　者：李庆忠[1] 陈永涛[1] 胡海波[1] 徐永波[2] 

机构地区：[1]中国工程物理研究院流体物理研究所,冲击波物理与爆轰物理国防科技重点实验室,四川绵阳621900 [2]中国科学院金属研究所,材料科学国家重点实验室,辽宁沈阳110016

出　　处：《高压物理学报》2010年第2期107-112,共6页Chinese Journal of High Pressure Physics

基　　金：China Academy of Engineering Physics Foundation(20060104,2009B0201014);National Natural Science Foundation(10776032,10902102)

摘　　要：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。By means of velocity interferometer system for any reflector （VISAR）, X-ray diffraction （XRD） and scanning electron microscope （SEM）, phase transition and spalling behavior of the FeMnNi alloy were studied through symmetric impact and reverse impact experiments. The FeMnNi alloy experiences a α→ε phase transformation when shocked to the pressure above 6.5 GPa. The FeMnNi alloy produces ε→ α reverse phase transition and rarefaction shock wave when the pressure reduce to 4 - 5 GPa due to the rarefaction wave. By analyzing the interaction among plastic wave, phase transition wave, rarefaction wave and rarefaction shock wave,it was found that the FeMnNi alloy has a physical mechanism inducing the formation of spall behavior in symmetric impact experiments as the impact stress exceeds α→ε transition threshold.

关 键 词：FeMnNi合金 相变 逆相变 层裂 稀疏冲击波 

分 类 号：O346.4[理学—固体力学]