钛在爆炸复合冲击载荷下的绝热剪切现象

ADIABATIC SHEARING PHENOMENON OF TITANIUM UNDER EXPLOSION-CLAD SHOCK LOADING

研究了在爆炸复合冲击载荷下工业纯钛和低碳钢（ＴＡ２／Ａ３）爆炸复合界面层附近ＴＡ２侧出现的绝热剪切带（ＡＳＢ）内的显微组织，表明其ＡＳＢ内具有等轴微晶组织特征并未发现微裂纹，ＡＳＢ内的显微硬度比附近基体略高，对仅在ＴＡ２侧产生ＡＳＢ，而在Ａ３侧从未观察到．这一现象从材料－力学－热学上进行了综合分析讨论．结果表明：应变丰和应变都影响绝热剪切过程；在爆炸复合冲击载荷这一近似绝热条件下，材料本身的物理性能（如比定容热容ｃｖ，密度ｐ等）、刀学性能（如导热系数ｋ）都影响ＡＳＢ产生的倾向性．

The microstructure of adiabatic shear band（ASB）for pure titanium developed under ex-plosion-clad shock loading was observed by means of OM and SEM. Very fine equiaxed mi-crocrystal structure without cavities was observed in ASB_s.Microhardness differences be-tween the bands and adjacent regions were slight．The reasons why ASB： only occurs on theTA2 side but not on the A3 side were respectively discussed in light of the materials'physi-cal，mechanical and thermal properties.