后热处理对搅拌摩擦加工制备Al-Ti复合材料组织特征的影响

doi:10.11896/j.issn.1005-023X.2018.22.012

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Abstract Al-Ti composites were fabricated by friction stir processing (FSP), and then post-treated at 600 ℃/6 h. The microstructures and phases of the friction zone were analyzed by SEM, TEM and XRD. The lattice constant of the phase before and after the heat treatment was measured by X-ray diffraction analysis software TOPAS. The microstructure of Al-Ti composites prepared by friction stir processing were studied at the effects of post-heat treatment. The results show that the intermetallic compound has a good interface with aluminum base after 600 ℃/6 h post heat treatment; the interdiffusion between Ti, Al and Al₃Ti can be accele-rated by the post-heat treatment, which can promote the formation of Al₃Ti and new phase Al₅Ti₂ intermetallic compounds. In addition, there exists dislocations walls in the microstructure. The axial ratios of Al₃Ti c/a before and after heat treatment are higher than standard data, but the degree of change after heat treatment is about 0.4%, which is obviously lower than that of 1.2% before heat treatment. After the heat treatment, the proliferation, re-diffusion and interaction of the micro-defects caused by the friction stir processing of the Al-Ti composite material cause the in-situ reaction to proceed again, which promotes the increase of the intermetallic compound content in the friction stir zone.

Key words： friction stir processing Al-Ti composites post-heat treatment intermetallic compound microstructure

Published: 21 December 2018

CLC number:	TB311
	TG156.99
	TG146.21

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	Articles by authors
	HUANG Shuowen
	HUANG Chunping
	WU Zhongwen
	XIA Chun
	LIU Fencheng
	KE Liming

Cite this article:

HUANG Shuowen,HUANG Chunping,WU Zhongwen, et al. Effects of Post Heat Treatment on Al-Ti Composites Microstructure Prepared by Friction Stir Processing[J]. Materials Reports, 2018, 32(22): 3908-3912.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.22.012 OR http://www.mater-rep.com/EN/Y2018/V32/I22/3908

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