Semi-solid Microstructure Evolution of As-extruded 7075 Aluminum Alloy during Semi-solid Reheating Process

Zhang Jingyu; Liu Hongjun

doi:10.15980/j.tzzz.2016.07.014

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Semi-solid Microstructure Evolution of As-extruded 7075 Aluminum Alloy during Semi-solid Reheating Process
Vol. 36, Issue 7, Pages: 717-721(2016)
Published： 2016 ，
DOI： 10.15980/j.tzzz.2016.07.014

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[1]张靖宇,刘洪军.挤压态7075铝合金半固态加热过程中的组织演变[J].特种铸造及有色合金,2016,36(07):717-721.

Zhang Jingyu, Liu Hongjun. Semi-solid Microstructure Evolution of As-extruded 7075 Aluminum Alloy during Semi-solid Reheating Process. [J]. Special Casting & Nonferrous Alloys 36(7):717-721(2016)
[1]张靖宇,刘洪军.挤压态7075铝合金半固态加热过程中的组织演变[J].特种铸造及有色合金,2016,36(07):717-721. DOI： 10.15980/j.tzzz.2016.07.014.

Zhang Jingyu, Liu Hongjun. Semi-solid Microstructure Evolution of As-extruded 7075 Aluminum Alloy during Semi-solid Reheating Process. [J]. Special Casting & Nonferrous Alloys 36(7):717-721(2016) DOI： 10.15980/j.tzzz.2016.07.014.

摘要

研究了加热温度和保温时间对部分重熔再结晶方法（RAP）制备7075铝合金半固态坯料过程中的组织演变的影响。结果表明

通过在半固态温度区间加热可以将挤压态7075铝合金的纤维组织转变为半固态颗粒状晶粒组织。随着加热温度的提高和保温时间延长

挤压态组织逐渐消失

颗粒状晶粒经再结晶生长并合并长大;颗粒状晶粒的尺寸随加热温度和保温时间的增加而变大。在试验条件下

高温短时间加热比低温长时间下获得的半固态组织更加细小均匀。通过试验得出RAP法制备7075铝合金半固态坯料的优化工艺参数为600℃下保温5min。

Abstract

Semi-solid 7075 aluminum alloy billets were prepared by recrystallization and partial remelting（RAP）technology.The influences of heating temperature and holding time on microstructure evolution were investigated.The results show that the fibrous microstructure in as-extruded 7075 aluminum alloy is transformed into semi-solid granular ones after heating treatment.As increasing in the heating temperature and holding time

the as-extruded microstructure gradually disappears

and the granular grains are generated and grown through recrystallization process.The size of semi-solid granular microstructure is increased with the increase of heating temperature and holding time.Under the experimental conditions

the semi-solid microstructure heated at a higher temperature with short time is the more homogeneous than that of ones heated at a lower temperature with long time.Based on experimental analysis

the satisfied semi-solid 7075 aluminum alloy billets by RAP method can be fabricated with heating at 600℃for 5min.