冲击载荷下铜基摩擦材料微观形变

刘建秀; 刘玮; 韩长生; 李英华; 张祖根

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冲击载荷下铜基摩擦材料微观形变
Micro-deformation of Cu Base Frictional Materials under Impact Load
2004年第4期页码：31-33
纸质出版日期： 2004 ，
DOI：

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[1]刘建秀,,,,,,,,,刘玮,,,,,,,,,韩长生,,,,,,,,,李英华,,,,,,,,,张祖根.冲击载荷下铜基摩擦材料微观形变[J].特种铸造及有色合金,2004(04):31-33+78.

Liu Jianxiu. Micro-deformation of Cu Base Frictional Materials under Impact Load[J]. Special Casting & Nonferrous Alloys, 2004,(4):31-33.
[1]刘建秀,,,,,,,,,刘玮,,,,,,,,,韩长生,,,,,,,,,李英华,,,,,,,,,张祖根.冲击载荷下铜基摩擦材料微观形变[J].特种铸造及有色合金,2004(04):31-33+78. DOI：

Liu Jianxiu. Micro-deformation of Cu Base Frictional Materials under Impact Load[J]. Special Casting & Nonferrous Alloys, 2004,(4):31-33. DOI：

摘要

研究冲击载荷下铜基摩擦材料的微观形变

试验是在分离式Hopkinson压杆上完成的

载荷工况分没围压和有围压两种

应变率范围为（10 2 ～ 10 3 ） /s。冲击后的试件做SEM和X衍射分析。试验结果表明 :该材料在没有围压时塑性变形以滑移为主

宏观形貌为冲击脆性破坏

断裂模式为沿晶断裂 ;在有围压时

基体上出现了孪晶现象和塑性流动的湍流花纹

塑性变形的形式为滑移和孪晶的组合

Abstract

The micro deformation of Cu base frictional materials obtained with powder metallurgy under impact load was conducted on Hopkinson pressure bar with confined pressure and non confined pressure in the range of strain rate （10 2～10 3）/s.The impacted specimen was analyzed by SEM and X ray diffraction.The results showed that the slip dislocation was dominated in plastic deformation of the materials with defects under non confined pressure

showing the macro morphology with impact brittle damage and fracture along with grain boundary while plastic deformation was attributed to the combination of slip dislocation with turbulent pattern and twin-crystal in the matrix under confined pressure.