Microstructural Evolution of An AZ63 Alloy during Partial Remelting

Huang Liankai; Chen Tijun; Zhang; Suqing

doi:10.15980/j.tzzz.2012.11.014

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Microstructural Evolution of An AZ63 Alloy during Partial Remelting
Vol. 32, Issue 11, Pages: 1019-1023(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.11.014

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[1]黄连凯,陈体军,张素卿,孙明杰.AZ63镁合金在部分重熔过程中的组织转变[J].特种铸造及有色合金,2012,32(11):1019-1023.

Huang Liankai, Chen Tijun, Zhang, et al. Microstructural Evolution of An AZ63 Alloy during Partial Remelting. [J]. Special Casting & Nonferrous Alloys 32(11):1019-1023(2012)
[1]黄连凯,陈体军,张素卿,孙明杰.AZ63镁合金在部分重熔过程中的组织转变[J].特种铸造及有色合金,2012,32(11):1019-1023. DOI： 10.15980/j.tzzz.2012.11.014.

Huang Liankai, Chen Tijun, Zhang, et al. Microstructural Evolution of An AZ63 Alloy during Partial Remelting. [J]. Special Casting & Nonferrous Alloys 32(11):1019-1023(2012) DOI： 10.15980/j.tzzz.2012.11.014.

摘要

研究了未细化和经1.2%的MgCO3细化处理的AZ63镁合金在部分重熔过程中的组织演变

并对其机理进行了分析。结果表明

细化处理和未细化处理的AZ63镁合金经部分重熔后均可获得理想的半固态组织。但细化处理后的球化速度加快

其主要原因是细化处理前后铸态组织中β相的分布不同;未细化的枝晶臂较为发达

晶界面积较大

β相的分布较为分散

在达到共晶温度时几乎消失

固溶到晶粒内部

使相邻的晶粒相连接

并且合并长大。

Abstract

The microstructural evolution of AZ63 alloy without refining and refined with 1.2% MgCO3 was observed during partial remelting

and its mechanism was analyzed. The results show that both of AZ63 alloys without refining and refined with 1.2% MgCO3 can obtain desirable semi-solid microstructure. The spheroidization rate of AZ63 alloy refined with MgCO3 is increased

which is attributed to the different distribution of β phase in the as-cast microstructure after and before refining treatment. The dendritic arms of specimens without refining become relatively developed

and the area of crystal boundary is comparatively larger

meanwhile

the β phase is more dispersive and almost disappeared in the microstructure with the specimens at eutectic temperature

leading to mergence and growth of adjacent crystal.