Microstructure and mechanical properties of ZA104 (0.3–0.6Ca) die-casting magnesium alloys
Microstructure and mechanical properties of ZA104 (0.3–0.6Ca) die-casting magnesium alloys
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DOI：
10.1016/j.msea.2004.06.063
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发表时间：
2004-11
期刊：
影响因子：
6.4
通讯作者：
Z. Zhang;R. Tremblay;D. Dubé
中科院分区：
文献类型：
--
作者：
Z. Zhang;R. Tremblay;D. Dubé
本文研究了两种新型实验镁合金（ZA 104 + 0.3Ca和ZA 104 + 0.6Ca）的压铸和缓冷试样的显微组织。试样的微观分析表明，基体中存在α-Mg相和两种Zn/Al比不同的含钙金属间化合物。这些化合物的晶体结构与τ相[Mg_（32）（Al，Zn）_（49）]的晶体结构接近，在缓慢冷却的ZA_（104）+ 0.3Ca样品中也发现了这些化合物，并将其鉴定为（[式：见正文]和[式：见正文]）。这些金属间化合物的显微硬度已经从具有金属间化合物组合物的试样中获得，并从熔体中缓慢冷却。还介绍了ZA 104 + 0.3Ca和ZA 104 + 0.6Ca两种压铸合金的拉伸和蠕变抗力。拉伸性能与AZ 91 D参比合金相当，但其蠕变变形速率在150°C下显著降低3.5-3.8倍，在175°C下显著降低4.0-7.2倍。另外，ZA 104 + 0.3Ca合金的抗拉强度和延伸率均上级ZA 104 + 0.6Ca合金。然后确定含钙的金属间相[式：见正文]和[式：见正文]比τ相更硬，并且显著改善了这些新ZA实验合金的抗蠕变性。
In this paper, the microstructure of die-cast and slowly cooled specimens of two new experimental magnesium alloys (ZA104 + 0.3Ca and ZA104 + 0.6Ca) is examined. Microanalysis of specimens has revealed the presence of α-Mg phase (matrix) and two intermetallic compounds containing calcium with different Zn/Al ratios. These compounds, which have a crystal structure close to that of τ phase [Mg32(Al,Zn)49], were also found in slowly cooled ZA104 + 0.3Ca specimens and identified as ( [Formula: see text] and [Formula: see text] ). The microhardness of these intermetallic compounds has been obtained from specimens having the intermetallic composition and slowly cooled from the melt. The tensile and creep resistance of the two die-cast alloys (ZA104 + 0.3Ca and ZA104 + 0.6Ca) are also presented. Tensile properties are equivalent to those of the AZ91D reference alloy, but their creep deformation rate is significantly reduced by a factor 3.5–3.8 at 150°C and 4.0–7.2 at 175°C. Besides, it was found that the ultimate tensile strength and elongation of ZA104 + 0.3Ca alloy are superior to those of ZA104 + 0.6Ca alloy. It is then established that the intermetallic phases [Formula: see text] and [Formula: see text] containing calcium are harder than τ phase and improve substantially the creep resistance of these new ZA experimental alloys.