采用湿喷丸技术处理铝合金表面,研究喷丸强度对2219铝合金扩散连接的影响。结果表明:随着喷丸强度的提高,表面粗糙度由0.1 mm N的1.917μm增加到0.3 mm N的3.401μm,且过大的喷丸强度易导致表面出现轻微的剥落损伤现象;喷丸强化提供的...采用湿喷丸技术处理铝合金表面,研究喷丸强度对2219铝合金扩散连接的影响。结果表明:随着喷丸强度的提高,表面粗糙度由0.1 mm N的1.917μm增加到0.3 mm N的3.401μm,且过大的喷丸强度易导致表面出现轻微的剥落损伤现象;喷丸强化提供的残余应力场可以促进界面的扩散连接过程,一方面加速溶质原子扩散并在界面聚集成相且与氧化物产生交互作用;另一方面促进再结晶晶粒形成,利用新晶界的动态迁移过程消除原始界面,两者共同作用提升了界面的愈合效果,0.1 mm N时界面剪切强度可由无喷丸的12.6 MPa提升至41.1 MPa。展开更多
The billets of Al-Zn-Mg-Cu-Zr and Al-Zn-Mg-Cu-Zr-0.5Er alloys were prepared by semi-continuous direct chill casting （DCC）.The effects of trace Er on microstructure of Al-Zn-Mg-Cu-Zr alloy under as-cast and homogeniz...The billets of Al-Zn-Mg-Cu-Zr and Al-Zn-Mg-Cu-Zr-0.5Er alloys were prepared by semi-continuous direct chill casting （DCC）.The effects of trace Er on microstructure of Al-Zn-Mg-Cu-Zr alloy under as-cast and homogenization conditions were studied.The results show that the grain morphology is large dendritic structure and the grain size increases obviously by the addition of 0.5% Er.Moreover,most of Er element in the alloy segregates at grain boundary during solidification,resulting in ternary Al8Cu4Er phase.After homogenization,most of the MgZn2 phase at grain boundary has dissolved back to Al matrix in the two alloys.In the Er-containing alloy,the dissolution temperature of Al8Cu4Er phase is about 575 °C.Therefore,the homogenization treatment cannot eliminate Al8Cu4Er phase validity.展开更多
文摘采用湿喷丸技术处理铝合金表面,研究喷丸强度对2219铝合金扩散连接的影响。结果表明:随着喷丸强度的提高,表面粗糙度由0.1 mm N的1.917μm增加到0.3 mm N的3.401μm,且过大的喷丸强度易导致表面出现轻微的剥落损伤现象;喷丸强化提供的残余应力场可以促进界面的扩散连接过程,一方面加速溶质原子扩散并在界面聚集成相且与氧化物产生交互作用;另一方面促进再结晶晶粒形成,利用新晶界的动态迁移过程消除原始界面,两者共同作用提升了界面的愈合效果,0.1 mm N时界面剪切强度可由无喷丸的12.6 MPa提升至41.1 MPa。
基金Project(50875031) supported by the National Natural Science Foundation of ChinaProject(2005CB623705) supported by National Basic Research Program of China
文摘The billets of Al-Zn-Mg-Cu-Zr and Al-Zn-Mg-Cu-Zr-0.5Er alloys were prepared by semi-continuous direct chill casting （DCC）.The effects of trace Er on microstructure of Al-Zn-Mg-Cu-Zr alloy under as-cast and homogenization conditions were studied.The results show that the grain morphology is large dendritic structure and the grain size increases obviously by the addition of 0.5% Er.Moreover,most of Er element in the alloy segregates at grain boundary during solidification,resulting in ternary Al8Cu4Er phase.After homogenization,most of the MgZn2 phase at grain boundary has dissolved back to Al matrix in the two alloys.In the Er-containing alloy,the dissolution temperature of Al8Cu4Er phase is about 575 °C.Therefore,the homogenization treatment cannot eliminate Al8Cu4Er phase validity.
