Microstructure Evolution of Semi-solid Al-20Si-1Sm Alloy during Isothermal Heat Treatment Process

Hu Yong; Yu Nan; Zhao Longzhi; Piao Mengchao

doi:10.15980/j.tzzz.2017.01.003

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Microstructure Evolution of Semi-solid Al-20Si-1Sm Alloy during Isothermal Heat Treatment Process
Vol. 37, Issue 1, Pages: 8-11(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.01.003

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[1]胡勇,余楠,赵龙志,朴梦超.Al-20Si-1Sm合金在半固态等温热处理过程中的组织演变[J].特种铸造及有色合金,2017,37(01):8-11.

Hu Yong, Yu Nan, Zhao Longzhi, et al. Microstructure Evolution of Semi-solid Al-20Si-1Sm Alloy during Isothermal Heat Treatment Process. [J]. Special Casting & Nonferrous Alloys 37(1):8-11(2017)
[1]胡勇,余楠,赵龙志,朴梦超.Al-20Si-1Sm合金在半固态等温热处理过程中的组织演变[J].特种铸造及有色合金,2017,37(01):8-11. DOI： 10.15980/j.tzzz.2017.01.003.

Hu Yong, Yu Nan, Zhao Longzhi, et al. Microstructure Evolution of Semi-solid Al-20Si-1Sm Alloy during Isothermal Heat Treatment Process. [J]. Special Casting & Nonferrous Alloys 37(1):8-11(2017) DOI： 10.15980/j.tzzz.2017.01.003.

摘要

研究了Al-20Si-1Sm合金在半固态等温热处理过程中的组织演变。结果表明

随着等温热处理温度和时间的增加

液相量增加

共晶α-Al相球化

尺寸先减小后增大。共晶Si呈羽毛状

初生Si裂解成小块状并明显钝化。在等温温度为610℃

保温时间为15min时

合金中共晶α-Al相的球化效果最佳

平均尺寸为37μm

初生Si平均尺寸为30μm。

Abstract

The microstructure evolution of semi-solid Al-20Si-1Sm alloy during isothermal heat treatment process was observed.The results show that

with the increase of isothermal treatment temperature and time

the volume fraction of liquid phase is increased

and morphology of the eutecticα-Al phase is spheroidized with the grain size decrease at first and then increase.Meanwhile

the eutectic silicon exhibits feathery structure

and the primary silicon is decomposed into small polygonal particles.The desirable spherical eutecticα-Al phase can be achieved with 37μm and average size of the primary silicon is 30μm after treated at 610 ℃for 15 min.