Modification of Mg2Si morphology in squeeze cast Mg-Al-Zn-Si alloys by Ca or P addition
Modification of Mg2Si morphology in squeeze cast Mg-Al-Zn-Si alloys by Ca or P addition
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DOI：
10.1016/s1359-6462(99)00172-4
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发表时间：
1999-07-09
影响因子：
6
通讯作者：
Kim, NJ
中科院分区：
文献类型：
--
作者：
Kim, JJ;Kim, DH;Kim, NJ
轻质合金在运输系统中具有不同程度的重要性。例如，在航空航天工业中，轻质合金的进步一直是提高性能的关键。此外，最近对汽车减重的需求不断增长，汽车工业对轻质合金产生了相当大的兴趣。从这些方面来看，镁合金作为迄今为止开发的最轻的商用合金，在高性能航空航天和汽车应用方面具有巨大的潜力[1-4]。然而，强度、韧性和耐腐蚀性的合理结合一直是镁合金面临的主要挑战。近年来的研究表明，在Mg-Al-Zn合金中加入Si、稀土等合金元素，可以显著提高合金的强度、韧性和耐腐蚀性[5-7]。稀土元素价格昂贵，且难以实现均匀化。另一方面，加入Si形成的Mg2Si是一种非常有用的金属间化合物，具有高熔点、低密度和高弹性模量[8]的特点。然而，由于Mg2Si颗粒的不良形貌（尺寸、形状和分布），在Mg合金中添加Si通常会导致较差的力学性能。本研究旨在通过添加Ca或P来改变Mg2Si颗粒的形貌，从而改善含Mg2Si镁合金的力学性能。
Lightweight alloys have had varying degrees of importance in transportation systems. In aerospace industries, for example, the advances made in lightweight alloys have always provided the key to the improvements in performance. Moreover, recent growing demand for weight reduction of the vehicle has generated a considerable interest for lightweight alloys from the automotive industries. From these respects, Mg alloys, the lightest commercial alloys developed so far, have great potential for high performance aerospace and automotive applications [1–4]. However, the proper combination of strength, toughness and corrosion resistance has been a major challenge for Mg alloys. Recent studies indicate that addition of alloying elements such as Si and rare earth elements to Mg-Al-Zn alloys can produce substantial improvements in strength, toughness and corrosion resistance [5–7]. Rare earth elements are very expensive and difficult to be alloyed homogeneously. On the other hand, Mg2Si formed by the addition of Si is the very useful intermetallic compound that exhibits high melting point, low density and high elastic modulus [8]. However, the addition of Si to Mg alloys often results in poor mechanical properties due to the undesirable morphology (size, shape and distribution) of Mg2Si particles. The present study is aimed at improving the mechanical properties of Mg2Si containing Mg alloys through the modification of morphology of Mg2Si particles by Ca or P addition.