EFFECT OF AGING TREATMENT AND La CONTENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AZ91 ALLOY

doi:10.3724/SP.J.1037.2010.00560

Acta Metall Sin

2011, Vol. 47

Issue (6): 743-750 DOI: 10.3724/SP.J.1037.2010.00560

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EFFECT OF AGING TREATMENT AND La CONTENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AZ91 ALLOY

WANG Shebin ^1,2, QI Xiaoye ¹, ZHANG Jinling ^1,2, LIU Lu ¹, XU Bingshe ^1,2

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

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WANG Shebin QI Xiaoye ZHANG Jinling LIU Lu XU Bingshe. EFFECT OF AGING TREATMENT AND La CONTENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AZ91 ALLOY. Acta Metall Sin, 2011, 47(6): 743-750.

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Abstract The effects of aging treatment and La content on the microstructures and mechanical properties of AZ91 magnesium alloys were investigated by XRD, SEM, EDS and microhardness meter. The results showed that a great number of β–phases were precipitated and distributed along the grain boundaries after aging treatment. As the content of La increased, the grain size of β–phase decreased gradually, while α–phase decreased first and then increased. The mechanical properties of as–cast and aged specimens increased first and then decreased as the cotet of La increased. The tensile strength, yield strength, elongatin and Vickers hardness of aged magesium alloys were increased by 12.65%, 16.85%, 13.71% and 37.24%, espectively. When the content of La was 0.1648%, the tensile strength, yield strength, elongation and Vickers hardness achieved 276 MPa, 208 MPa, 13.85% and 132 HV, respectively.

Key words: AZ91 magnesium alloy aging mechanical property microstructre

Received: 21 October 2010

ZTFLH:

TG166.4

Fund:

Supported by National Natural Science Foundation of China (No.50901048) and Returned Overseas Graduates Scientific Research Projects of Shanxi Province (No.2008–39)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00560 OR https://www.ams.org.cn/EN/Y2011/V47/I6/743

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