摘要
采用直径为 4mm的GCr15钢珠作为弹丸对两种不同组织状态的TC4合金进行撞击试验 ,撞击速度为 1.5km/s ;观察撞击后不同厚度靶材的宏观损伤及微观损伤行为。结果表明 :靶材的组织状态对靶材的宏观损伤行为有很大的影响 ;时效处理态的组织具有更高的绝热剪切敏感性 ,在中厚靶发生了绝热冲塞 ;退火态中厚靶的背面则发生了凸起。各种靶材的微观损伤形式基本相同 ,在弹坑附近出现了大量的绝热剪切带 ;微孔洞在绝热剪切带内形核、长大并连结成为裂纹。
The targets of TC4 alloy with two different microstructures are impacted by 4 m m d iameter GCr15 steel ball with a speed of 1.5 km/s. The damage behavior of diffe rent thickness targets as well as micro damage behavior are observed. Experimental results show that the alloy microstruc ture has obvious effect on the macro-damage. The microstructure of aged state h as more adiabatic shear susceptibility and adiabati c plugging forms in the mid-thickness target. A bulge is observed on the back o f mid-thickness target of annealed state. Different targets have always the sa me micro-da mage forms. Abundant adiabatic shear bands (ASBs) are observed near craters. The micro-voids nucleate, grow and coarsen in ASBs, which lead to premature failur e.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2004年第5期44-48,57,共6页
Aerospace Materials & Technology
基金
哈尔滨工业大学校基金资助 :HIT .2 0 0 2 .3 2
