合金均勻化過程中的組織演變
(北京有色金屬研究總院 有色金屬材料制備加工國(guó)家重點(diǎn)實(shí)驗(yàn)室，北京 100088)
摘 要: 采用光學(xué)顯微鏡、掃描電鏡、透射電鏡、X射線衍射、差熱分析等手段，研究了噴射成形Al-9.97Zn-2.65Mg-1.94Cu-0.12%Zr合金在均勻化過程中微觀組織的演變。結(jié)果表明：均勻化處理可使合金中的一次析出相明顯減少，經(jīng)470 ℃均勻化處理24 h的Al-9.97Zn-2.65Mg-1.94Cu-0.12%Zr合金的晶粒尺寸沒有明顯長(zhǎng)大，大多數(shù)AlZnMgCu四元相回溶到基體中；均勻化態(tài)組織除α(Al)外，主要存在3種不同的相，分別為AlZnMgCu四元相、Al9FeNi相以及Al3Zr(L12) 彌散粒子。
關(guān)鍵字: 噴射成形；均勻化處理；Al-Zn-Mg-Cu合金
（State Key Laboratory for Fabrication and Processing of Nonferrous Metals,
General Research Institute For Nonferrous Metals, Beijing 100088, China）
Abstract:Microstructural evolution of spray formed Al-9.97Zn-2.65Mg-1.94Cu-0.12%Zr alloy during homogenization was studied by using optical microscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffractometry and differential scanning calorimetry. The results show that the homogenization can decrease the primary precipitates of the alloy obviously, and the coarsening of the grains is not obvious during homogenization treatment at 470 ℃ for 24 h, and most of the AlZnMgCu phases are dissolved into the matrix. After homogenization, the microstructure of the alloy is composed of α(Al), AlZnMgCu phases, Al9FeNi phases and Al3Zr (L12) dispersoids.
Key words: spray-formed; homogenization; Al-Zn-Mg-Cu alloy
