CAJ | 학술논문

采用金相显微镜、差热分析(DSC)和透射电镜(TEM)研究复合添加0.03%Sc 与0.12%Zr 及固溶处理对Al?9.0Zn?2.8Mg?2.5Cu合金组织性能的影响，以及添加少量(小于0.1%)的Sc是否能得到高性能铝合金。结果表明：添加0.03%Sc与0.12%Zr可以使Al?9.0Zn?2.8Mg?2.5Cu合金出现“花瓣状”的Al3(Sc,Zr)析出相；Al3(Sc,Zr)粒子对位错有强烈的钉扎作用，明显抑制 Al?9.0Zn?2.8Mg?2.5Cu 合金在均匀化和挤压过程中的再结晶；多级固溶明显优于单级固溶，可以在添加少量Sc(小于0.1%)时，避免Al?9.0Zn?2.8Mg?2.5Cu发生再结晶：(420°C，3 h)+(465°C，2 h)为最佳固溶条件，此时Al?9.0Zn?2.8Mg?2.5Cu?0.12Zr?0.03Sc合金的抗拉强度为777.29 MPa，伸长率为11.84%。
채용금상현미경、차열분석(DSC)화투사전경(TEM)연구복합첨가0.03%Sc 여0.12%Zr 급고용처리대Al?9.0Zn?2.8Mg?2.5Cu합금조직성능적영향，이급첨가소량(소우0.1%)적Sc시부능득도고성능려합금。결과표명：첨가0.03%Sc여0.12%Zr가이사Al?9.0Zn?2.8Mg?2.5Cu합금출현“화판상”적Al3(Sc,Zr)석출상；Al3(Sc,Zr)입자대위착유강렬적정찰작용，명현억제 Al?9.0Zn?2.8Mg?2.5Cu 합금재균균화화제압과정중적재결정；다급고용명현우우단급고용，가이재첨가소량Sc(소우0.1%)시，피면Al?9.0Zn?2.8Mg?2.5Cu발생재결정：(420°C，3 h)+(465°C，2 h)위최가고용조건，차시Al?9.0Zn?2.8Mg?2.5Cu?0.12Zr?0.03Sc합금적항랍강도위777.29 MPa，신장솔위11.84%。
Effects of additions minor contents of 0.03%Sc and 0.12%Zr and solution treatment on microstructure and mechanical properties of Al?9.0Zn?2.8Mg?2.5Cu alloy were studied by metallographic microscopy, differential thermal analysis (DSC) and transmission electron microscopy (TEM), in order to obtain high-performance Al alloys. The minor additions of Sc (less than 0.1%) were carried out. The results show that with the additions of 0.03% Sc and 0.12% Zr, the petaloid Al3(Sc,Zr) precipitated phases occur in Al?9.0Zn?2.8Mg?2.5Cu alloy, and Al3(Sc,Zr) particles obviously hinder the recrystallization of Al?9.0Zn?2.8Mg?2.5Cu alloy during homogenizing and extruding processes due to their strong pinning effect on dislocation. Multi-stage solution is better than single solution, for it can avoid recrystallization of Al?9.0Zn?2.8Mg?2.5Cu alloy with the minor contents of Sc (less than 0.1%). The proper solution treatment is (420 °C, 3 h)+(465 °C, 2 h) under which Al?9.0Zn?2.8Mg?2.5Cu?0.12Zr?0.03Sc alloy obtains a tensile strength of 777.29 MPa and a elongation of 11.84%.