PRECIPITATION BEHAVIOR OF AZ91 MAGNESIUM ALLOYS WITH DIFFERENT La CONTENTS

doi:10.3724/SP.J.1037.2012.00014

Acta Metall Sin

2012, Vol. 48

Issue (5): 607-614 DOI: 10.3724/SP.J.1037.2012.00014

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PRECIPITATION BEHAVIOR OF AZ91 MAGNESIUM ALLOYS WITH DIFFERENT La CONTENTS

ZHANG Jinling^1,2,3, FENG Zhiyong¹, HU Lanqing^1,2,3,WANG Shebin^1,2,3, XU Bingshe^1,2,3

1. Taiyuan University of Technology, College of Material Science and Technology, Taiyuan 030024
2. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan 030024
3. Shanxi Research Center of Advanced Materials Science and Technology,Taiyuan 030024

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ZHANG Jinling1,2,3, FENG Zhiyong1, HU Lanqing1,2,3,WANG Shebin1,2,3, XU Bingshe1,2,3. PRECIPITATION BEHAVIOR OF AZ91 MAGNESIUM ALLOYS WITH DIFFERENT La CONTENTS. Acta Metall Sin, 2012, 48(5): 607-614.

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Abstract The changes of microhardness, microstructures and precipitation phase morphologies of as--cast and aged AZ91 alloys with different La were characterized by TEM, OM, SEM and Vickers. The influences of discontinuous β phase and Al₁₁La₃ on AZ91 magnesium alloy were discussed and the diffusion coefficient of Al atom in the aging process was calculated. The results showed that the alloy with 0.16%La aged at 170 ℃ for 24 h has the largest hardness (138 HV). By extending aging time and adding La element, the discontinuous precipitation phases was transformed into continuous lath--sharped phases and the diffusion coefficient of Al atom was decreased, the volume and distribution of β phase were changed. During the process of heat treatment, the topography of Al₁₁La₃ in grain boundary was not changed, but the anchoring effect of Al₁₁La₃ restricted the growth of β phase. By controlling the content of La and parameters of aging treatment, the volume and size of β phase were changed, in the mean time the strengthening and toughness properties of alloys can been improved effectively.

Key words: AZ91 magnesium alloy aging treatment La solution diffusion coefficient

Received: 09 January 2012

ZTFLH:

TG146.6

Fund:

National Natural Science Foundation of China

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	ZHANG Jin-Ling
	FENG Zhi-Yong
	HU Lan-Jing
	YU She-Bin
	XU Bing-She

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00014 OR https://www.ams.org.cn/EN/Y2012/V48/I5/607

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