摘要
为深入分析高应变速率下镁合金绝热剪切带形成区域内微孔洞和裂纹的特点,进而研究绝热剪切带内部微裂纹的形成机制,采用分离式Hopkinson压杆装置对挤压态AZ31镁合金帽状试样进行了高速冲击实验,并且对冲击后的试样组织形貌进行OM、SEM和TEM观察。探讨了绝热剪切带内部裂纹的形成过程。结果表明:绝热剪切带形成于最大切应力处,在绝热剪切带内部首先形成微小孔洞。随着载荷的增加,微小孔洞扩展。
In order to deeply analyze the void and crack in adiabatic shear bands(ASB)of Mg alloy at high strain rate,the formation mechanism of micro cracks in adiabatic shear bands was studied.The split hopkinson pressure bar(SHPB)was used to carry out high speed impact experiment for the hat specimen of AZ31 magnesium alloy.The microstructure of the samples after impact was observed by OM,SEM and TEM.The process of the formation of micro cracks in adiabatic shear bands were discussed.The results show that the adiabatic shear band is formed at the maximum shear stress area.The void is firstly formed in ASB.With the increase of the impact loading,the void extend.
作者
杨蒙蒙
闫迎亮
耿苏楠
张鹏飞
YANG Mengmeng;YAN Yingliang;GENG Su'nan;ZHANG Pengfei(Shenyang Zhongti Equipment Manufacturing Co.,Ltd.,Shenyang 110000,China;Beijing Aerospace Propulsion Institute,Beijing 100076,China)
出处
《热加工工艺》
北大核心
2023年第22期119-122,共4页
Hot Working Technology
