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Influence of Heat Treatment on Microstructure and Mechanical Properties of Die-Cast AZ91D Alloy with RE Elements

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Abstract:

The effect of online solution and subsequent age heat treatment on microstructure and mechanical properties of die-cast AZ91D +1wt. %RE alloy were researched. The results indicated that online solution heat treatment led to inhibit some β-Mg17Al12 phase precipitation, and remained the Al element in matrix plays a role of solid solution strengthening. The online solution samples were aged at 160°C, 180°Cand 200°C. Microstructure results suggested that age treatment caused some lamellar β-Mg17Al12 phases precipitated near grain boundaries. The tensile properties of samples under air cool, online solution and subsequent age heat treatment were tested, which UTS were 194 MPa, 243 MPa and 244 MPa, and the elongation were 3.67%, 3.97% and 1.6%, respectively. The results indicated that the online solution could enhance the mechanical properties significantly, which the subsequent age heat treatment could not improve.

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Periodical:

Applied Mechanics and Materials (Volumes 633-634)

Pages:

98-102

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.633-634.98

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Online since:

September 2014

Authors:

Jia Wei Yuan, Xing Gang Li, Kui Zhang*, Ting Li, Yong Jun Li, Ming Long Ma, Guo Liang Shi, Meng Li

Keywords:

AZ91D Alloy, Heat Treatment, Mechanical Property, Microstructure

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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