2007, Vol. 43

Issue (10): 1077-1081 DOI:

Research Articles

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西北工业大学材料学院

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. . Acta Metall Sin, 2007, 43(10): 1077-1081 .

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Abstract The influence of alloying element Zn on the microstructures and properties of GW series sand-cast magnesium alloys was investigated in this paper by using optical microscopy, X-ray diffractometry, scanning electron microscopy. The results show that: the structure type of GW series magnesium alloys was similar to pure magnesium (h.c.p). Gd was resolved in the magnesium alloy. At the same time, Mg24Y5 was also founded in the GW series magnesium alloys. When alloying element Zn was added into the GW series magnesium alloys, the great changes about the microstructures were taken place. The snow-liked form grain formed, and didn’t disappear during the process of annealing, only just resolved in the magnesium alloy. Experimental alloys GWZ721 after Hot-treatment showed the outstanding mechanical properties at room temperature. The ultimate tensile strength reached 250MPa. Moreover, the yield strength reached 235MPa, far better than those of commercial magnesium AZ91C (85MPa) and ZK51A (140MPa). The elongation also reached 6.2% at most. The most important was that Experimental alloys GWZ721 after Hot-treatment also showed the outstanding mechanical properties at elevate room temperature. The ultimate tensile strength at 200℃、250℃and 300℃ was 225MPa、220MPa and 205MPa, respectively. The ultimate tensile strength and the yield strength decreased when the temperature increased, however, the elongation increased in step with the temperature. The microstructures of experimental alloys GW72 was improved when alloying element Zn was added into the GW series magnesium alloys. The cost of experimental alloys GW721 was cut down on the condition that the outstanding mechanical properties were realized. It can conclude that experimental alloys GW721was a kind of promising high-quality magnesium alloys.

Key words: Microstructures Mechanical properties GW series cast magnesium alloys annealing

Received: 12 February 2007

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