快速凝固高硅铝合金加热过程中的组织转变

doi:10.13251/j.issn.0254-6051.2020.05.009

金属热处理 ›› 2020, Vol. 45 ›› Issue (5): 45-50.DOI: 10.13251/j.issn.0254-6051.2020.05.009

快速凝固高硅铝合金加热过程中的组织转变

邬小萍¹, 聂俊辉²

1. 国合通用测试评价认证股份公司, 北京 100088;
2. 有研工程技术研究院有限公司, 北京 101400

收稿日期:2019-10-13 出版日期:2020-05-25 发布日期:2020-09-02
作者简介:邬小萍(1985—),女,硕士,主要研究方向为有色金属及其制备加工,E-mail: wuxp040301@sina.com

Microstructure transformation of rapidly solidified high-silicon aluminum alloy during heating process

Wu Xiaoping¹, Nie Junhui²

1. China United Test & Certification Co., Ltd., Beijing 100088, China;
2. Grimat Engineering Institute Co., Ltd., Beijing 101400, China

Received:2019-10-13 Online:2020-05-25 Published:2020-09-02

摘要/Abstract

摘要： 利用气雾化法制备高硅铝合金粉末,采用光学显微镜(OM)、扫描电镜(SEM)等现代测试手段,分析快速凝固高硅铝合金不同粒度粉末微观组织和结构特征,研究在不同加热温度和保温时间条件下针状富铁相的转变特性及β-Si相的粗化行为。结果表明:快速凝固高硅铝合金组织主要以基体上分布有大量细小的颗粒状和针状相为特征,合金粉末在加热过程中,随着温度的升高和保温时间的延长,颗粒β-Si相有粗化趋势,针状非平衡富铁相转变为棒状或颗粒状平衡相。通过台阶式连续加热模拟试验可获得针状相基本消失且颗粒β-Si相未发生明显粗化的组织。

关键词: 快速凝固, 高硅铝合金, 组织转变

Abstract: The rapidly solidified powders of a high-silicon aluminum alloy were manufactured by gas atomization process. The microstructure and structural characteristics of the alloy with different powder size as well as the transformation of needle iron-rich phase and the coarsening behavior of β-Si phase were investigated by means of OM, SEM and so on. The results show that the microstructure of the rapidly solidified alloy is mainly characterized by a large number of fine granular and needle-like phases distributed in the matrix. During the heating process, with the increase of temperature and holding time, granular β-Si phase becomes coarser, the needle-like metastable non-equilibrium iron-rich phase changes into stable clubbed or granular phase gradually. The results of simulated stepped heating experiments show that microstructures with the needle-like phase almost disappeared and with the granular β-Si phase not obviously coarsened can be obtained.

Key words: rapid solidification, high-silicon aluminum alloy, microstructure transformation

中图分类号:

TB31

邬小萍, 聂俊辉. 快速凝固高硅铝合金加热过程中的组织转变[J]. 金属热处理, 2020, 45(5): 45-50.

Wu Xiaoping, Nie Junhui. Microstructure transformation of rapidly solidified high-silicon aluminum alloy during heating process[J]. Heat Treatment of Metals, 2020, 45(5): 45-50.

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快速凝固高硅铝合金加热过程中的组织转变

Microstructure transformation of rapidly solidified high-silicon aluminum alloy during heating process

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