An investigation of the properties of Mg-Zn-Al alloys
An investigation of the properties of Mg-Zn-Al alloys
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DOI：
10.1016/s1359-6462(98)00122-5
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发表时间：
1998-06
影响因子：
6
通讯作者：
Zhan Zhang;A. Couture;A. Luo
中科院分区：
文献类型：
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作者：
Zhan Zhang;A. Couture;A. Luo
在过去的十年中，镁铸件在汽车和电子工业中的应用一直在以令人印象深刻的速度扩展。压铸是最有效的制造方法之一，已被广泛用于生产镁合金部件，特别是在汽车工业中。然而，可用于压铸的镁基合金的数量非常有限。目前，AZ 91仍然是最常用的压铸合金。虽然AZ 91提供了良好的机械性能、耐腐蚀性和压铸性的组合，但由于其较差的抗蠕变性和在高温下的强度降低，它不适合在高于120 C的温度下使用[1-4]。因此，迫切需要开发出抗蠕变性能好、铸造性能好、成本低的新型镁压铸合金。Mg-Zn-Al（ZA）是一种能够满足上述要求的有前途的合金体系[1，2]。但到目前为止，对该系统的研究还很少。本工作的目的是检查和评估的微观结构特征，拉伸性能和抗蠕变性，以便更好地全面了解该系统的合金，并确定最有前途的组合物。研究了微量Ca和Sr对ZA合金拉伸和蠕变性能的影响。
During the past ten years, the use of magnesium castings in the automotive and electronics industries has been expanding at an impressive rate. Die casting is one of the most effective fabrication methods and has been extensively used to produce magnesium components, especially in the automotive industry. However, the number of available Mg-based alloys for die casting is very limited. At the present time, AZ91 is still the most commonly used die casting alloy. Although AZ91 offers a good combination of mechanical properties, corrosion resistance and die castability, it is unsuitable for use at temperatures above 120 C due to its poor creep resistance and its decrease in strength at elevated temperatures [1–4]. Therefore, it is pressing to develop some new Mg die casting alloys with good creep resistance, acceptable castability and low cost. Mg-Zn-Al (ZA) is a promising alloy system which is able to meet the above requirements [1, 2]. But up to now, only a small amount of research has been carried out on this system. The aim of the present work is to examine and evaluate the microstructural features, tensile properties and creep resistance in order to get a better overall understanding of alloys of this system and to identify the most promising compositions. The influence of small additions of Ca and Sr on the tensile and creep properties of ZA alloys was also investigated.