6061铝合金冲击载荷作用下的变形断裂行为

利用常见的落锤冲击试验机和自行设计的夹具装置,研究6061铝合金材料在冲击载荷作用下的变形断裂行为。结果表明:6061铝合金受冲击载荷时的断裂行为与准静态拉伸相比无明显变化,损伤形式仍是由晶界处的微孔洞连接形成微裂纹,宏观上仍产生明显颈缩,试样的断裂面与拉伸轴方向大约成45°角。摆锤高度不同,试样表面的变形带不同,摆锤高度为141°时,出现了"白色变形带"。微观断口是由韧窝组成,冲击速度越大,韧窝越小。

Fracture behavior under impact load of 6061 aluminum alloy

The deformation fracture behavior under impact load of 6061 aluminum alloy has been tested using common drop hammer impact test machine and self-designed fixture tool.The results show that the fracture behavior of 6061 aluminum alloy under both of impact loading and sub-static tensile are no obvious change.The fracture way is still at the mini-pores of inter-crystalline,the fractured pores combined into crackles.The macro is still obvious necking.The angle between fracture surface and tensile axis of the specimen is approximately 45 °.The deformation band of specimen surface is different with different pendulum height.When the pendulum height gets to 141°,"white deformation bands" appears.The micro-fracture composed with dimples.The higher impact velocity,the smaller dimples appear.