Microstructure and Homogenization Treatment of 7075 Aluminum Alloy Ingot

Li Chengbo; Han Suqi; He Kezhun; Tang Luhua; Liu Shengdan; Zhang Xinming

doi:10.15980/j.tzzz.2016.12.004

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Microstructure and Homogenization Treatment of 7075 Aluminum Alloy Ingot
Vol. 36, Issue 12, Pages: 1248-1252(2016)
Published： 2016 ，
DOI： 10.15980/j.tzzz.2016.12.004

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[1]李承波,韩素琦,何克准,唐露华,刘胜胆,张新明.7075铝合金铸锭组织及均匀化研究[J].特种铸造及有色合金,2016,36(12):1248-1252.

Li Chengbo, Han Suqi, He Kezhun, et al. Microstructure and Homogenization Treatment of 7075 Aluminum Alloy Ingot. [J]. Special Casting & Nonferrous Alloys 36(12):1248-1252(2016)
[1]李承波,韩素琦,何克准,唐露华,刘胜胆,张新明.7075铝合金铸锭组织及均匀化研究[J].特种铸造及有色合金,2016,36(12):1248-1252. DOI： 10.15980/j.tzzz.2016.12.004.

Li Chengbo, Han Suqi, He Kezhun, et al. Microstructure and Homogenization Treatment of 7075 Aluminum Alloy Ingot. [J]. Special Casting & Nonferrous Alloys 36(12):1248-1252(2016) DOI： 10.15980/j.tzzz.2016.12.004.

摘要

采用光学显微镜察、扫描电镜（SEM）和透射电镜（TEM）观察等分析方法

研究了7075铝合金铸锭组织及均匀化工艺。结果表明

Al-Zn-Mg-Cu-Cr合金的铸态凝固组织由Al基体+Mg（Zn

Cu）2非平衡共晶相组成;均匀化温度在460℃时

合金中枝晶组织部分消失

低熔点相溶解不充分

在470℃均匀化出现过烧现象。合金经460℃×5h+480℃×24h和460℃×5h+490℃×24h均匀化之后

晶界处的共晶组织基本消除

但晶粒显著长大

两种双级均匀化的晶粒尺寸分别约为120μm和150μm。用400℃×5h+460℃×24h+470℃×24h三级均匀化后

基本消除了共晶组织

均匀化效果很好且晶粒尺寸约为75μm

是最佳的均匀化制度。

Abstract

The homogenization process and microstructure of 7075 alloy ingot were analyzed by optical microscopy（OM）

scanning electron microscopy（SEM）and transmission electron microscopy（TEM）.The results show that the microstructure of Al-Zn-Mg-Cu-Cr alloy ingot consists of Al matrix and Mg（Zn

Cu）2non-equilibrium eutectic phase.With homogenized at 460 ℃

the dendritic structure in the alloy disappears partly

and low melting point phases is dissolved insufficiencily

so alloy constituent exhibits unevenly diffusion

while with homogenized at 470 ℃

part of structure is overburned.After homogenized at 460℃×5h+480℃×24hand 460℃×5h+490℃×24h

the eutectic structure at grain boundary are bascally eliminated

however

grain size is grew up obviously

where the final grain size of the alloy at two homogenizing treatments reaches 120μm and 150μm

respectively.After treated at 400℃×5h+460 ℃×24h+470 ℃×24h

the eutectic structures is totally dissolved