STUDY OF ROLLING-REMELTING SIMA PROCESS FOR PREPARING THE SEMI-SOLID BILLET OF ZCuSn10 ALLOY

doi:10.3724/SP.J.1037.2013.00654

Acta Metall Sin

2014, Vol. 50

Issue (5): 567-574 DOI: 10.3724/SP.J.1037.2013.00654

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STUDY OF ROLLING-REMELTING SIMA PROCESS FOR PREPARING THE SEMI-SOLID BILLET OF ZCuSn10 ALLOY

WANG Jia^1,², XIAO Han¹(

), WU Longbiao¹, LU Dehong¹, ZHOU Rongfeng^1,³, ZHOU Rong¹

1 Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093
2 College of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong 643000
3 Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093

Cite this article:

WANG Jia, XIAO Han, WU Longbiao, LU Dehong, ZHOU Rongfeng, ZHOU Rong. STUDY OF ROLLING-REMELTING SIMA PROCESS FOR PREPARING THE SEMI-SOLID BILLET OF ZCuSn10 ALLOY. Acta Metall Sin, 2014, 50(5): 567-574.

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Abstract

Semi-solid billet of ZCuSn10 alloy is prepared by strain induced melt activation (SIMA) method which included the rolling and remelting process. Firstly, ZCuSn10 alloy is cast, and samples are cut from ingot casting. Secondly, the samples are rolled with 2~4 passes after holding at 450 ℃ for 15 min, then the new samples are cut from deformed alloy. Lastly, the new samples are reheated up to 850 ℃ or 875 ℃ for 15 min, then water quenching. Semi-solid microstructure is observed and compared with microstructure of ZCuSn10 alloy directly reheated after casting. The distribution of Sn element in microstructure under different conditions is measured by using EDS function of SEM, and the microstructure changes during the SIMA process are observed by means of OM and TEM. Based on the experiments, the microstructure evolution is synthetically analyzed and explained during the course of semi-solid billet of ZCuSn10 alloy prepared by SIMA method. The results indicate that semi-solid microstructure of ZCuSn10 alloy by rolling- remelting SIMA process is equal-fine grain, and spheroidization of solid particle is well. The optimum semi-solid microstructure is obtained when alloy deformed 19.7% is remelted at 875 ℃ for 15 min, the average grain diameter is 75.8 μm, shape factor is 1.62, and volume fraction of liquid phase is 17.28%. Deformation process plays a crucial role in grain refinement and spheroidization during SIMA process for preparing the semi-solid billet of ZCuSn10 alloy, as deformation and remelting temperature increases, the size and shape of solid phase in semi solid microstructure are smaller and more round, volume fraction of liquid phase increases. The main mechanism of SIMA process preparing semi-solid billet of ZCuSn10 alloy is that predeformation breaks dendrites and stores energy of deformation into dendrites, and promotes dendrites melting through remelting process. Meanwhile, liquid phase occupies sharp corners of solid particles by Sn element diffusing from liquid phase into α solid phase, so that fine, uniform and roundness α solid particles are gained.

Key words: ZCuSn10 alloy SIMA method deformation remelting temperature semi-solid microstructure

Received: 16 October 2013

ZTFLH:

TG335

Fund: Applied Basic Research Key Project of Yunnan Province (No.2011FA007),Specialized Research Fund for Doctoral Program of Higher Education (No.20125314120013), Scientific Research Fund of Yunnan Provincial Education Department (No.2012Y543) and Development Research Fund from Sichuan University of Science and Engineering (No.2013PY05)

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	Jia WANG
	Han XIAO
	Longbiao WU
	Dehong LU
	Rongfeng ZHOU
	Rong ZHOU

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00654 OR https://www.ams.org.cn/EN/Y2014/V50/I5/567

Fig.1

ZCuSn10合金铸锭的DSC曲线

表1 实验工艺及参数

Fig.2

ZCuSn10合金的原始铸态组织及变形量为19.7%的热轧态组织

Fig.3

ZCuSn10合金铸态组织的SEM像及Sn元素的分布

Fig.4

ZCuSn10合金热轧到19.7%变形量时组织的TEM像

Fig.5

ZCuSn10合金铸态重熔试样A和B的组织

Fig.6

试样H的TEM像

Fig.7

不同轧制-重熔SIMA工艺的ZCuSn10合金试样的组织

Fig.8

变形量对ZCuSn10合金半固态组织特征的影响

Fig.9

SIMA法制备ZCuSn10合金半固态坯料演变机理示意图

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