Reheating Process and Microstructural Evolution of Semi-solid 6061 Aluminum Alloy

Shang Shuzhen1; Lu Guimin2; Zhao Zuxin1

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Reheating Process and Microstructural Evolution of Semi-solid 6061 Aluminum Alloy
Vol. 30, Issue 2, Pages: 99-102(2010)
Published： 2010 ，
DOI：

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[1]尚淑珍,路贵民,赵祖欣.6061铝合金半固态坯料二次加热工艺及组织演变[J].特种铸造及有色合金,2010,30(02):99-102+91.

Shang Shuzhen1, Lu Guimin2, Zhao Zuxin1. Reheating Process and Microstructural Evolution of Semi-solid 6061 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 30(2):99-102(2010)
[1]尚淑珍,路贵民,赵祖欣.6061铝合金半固态坯料二次加热工艺及组织演变[J].特种铸造及有色合金,2010,30(02):99-102+91. DOI：

Shang Shuzhen1, Lu Guimin2, Zhao Zuxin1. Reheating Process and Microstructural Evolution of Semi-solid 6061 Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 30(2):99-102(2010) DOI：

摘要

针对近液相线半连续铸造技术制备的6061铝合金半固态坯料

在不同加热温度及保温时间下进行二次加热

采用光学显微镜及图像分析仪考察试样的微观形貌及尺寸特征

结合差热分析的方法研究加热过程中的液相形成、组织演变及晶粒长大过程。结果表明

二次加热温度及保温时间共同影响着微观组织演变过程

随着加热温度升高及保温时间延长

晶粒逐渐球化并长大。加热温度越高

组织演变速度越快;保温时间越长

晶粒球化并长大越明显。有效地控制二次加热温度及保温时间

能够获得均匀、圆整且相对细小的半固态组织。

Abstract

Microstructure and size of 6061 aluminum alloy semi-solid billets prepared by near-liquidus semi-continuous casting

which was reheated at different heating temperature and holding time

were observed by the Nikon E600POL optical microscope and image analyzer to investigate the formation of liquid phase

microstructure evolution and grain growth during reheating process combining with differential thermal analysis （DTA）. The results reveal that microstructural evolution is controlled by reheating temperature and holding time. With increasing in heating temperature and extending in holding time

grain is grown spherically and gradually

furthermore

microstructural evolution is faster and faster with increasing in heating temperature

and grain is grown more and more spherically with extending in holding time. The 6061 aluminum alloy semi-solid billets with homogeneous and round as well as fine structure can be prepared by effectively controlling reheating temperature and holding time.