期刊
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
卷 28, 期 1, 页码 66-73出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2018.01.006
关键词
AZ91 magnesium alloys; Sc; Heat treatment; Microstructure; Mechanical properties
资金
- National Key Research and Development Program of China [2016YFB0301100]
- National Natural Science Foundation of China [51531002, 51474043, 51401178]
- Ministry of Education of China [SRFDR 20130191110018]
- Natural Science Foundation of Chongqing [cstc2017jcyjBX0040]
- Chongqing Municipal Government [CSTC2013JCYJC60001]
- Chongqing Municipal Government (CEC project)
- Chongqing Municipal Government (Two River Scholar Project)
- Chongqing Municipal Government (Chief Scientist Studio Project)
- Fundamental Research Funds for the Central universities [106112016CDJXZ138811]
- Chongqing Science and technology [cstc2014kjrc-qnrc50002]
The as-cast and heat-treated microstructures and mechanical properties of the AZ91 magnesium alloys with and without minor Sc addition were investigated and compared in this paper. The results indicated that adding 0.15-0.45 wt% Sc to the as-cast AZ91 alloy not only could modify and refine the Mg17Al12 phase but also suppress the formation of the Mg17Al12 phase. At the same time, the grains of the Sc-containing as-cast AZ91 alloys were also effectively refined. As a result, the mechanical properties at room temperature (RT) for the Sccontaining as-cast AZ91 alloys were effectively improved. In addition, adding 0.15-0.45 wt% Sc to the AZ91 alloy promoted the formation of the continuous precipitates (CP) during the aging treatment in spite of that the formation of the discontinuous precipitates (DP) was simultaneously suppressed. Accordingly, the Sc-containing as-aged AZ91 alloys obtained the relatively higher mechanical properties at RT than the as-aged AZ91 alloy.
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