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首页> 外文期刊>Philosophical Magazine Letters >Enhancement of hardening and thermal resistance of Mg-Sn-based alloys by addition of Cu and Al
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Enhancement of hardening and thermal resistance of Mg-Sn-based alloys by addition of Cu and Al

机译：通过添加Cu和Al增强Mg-Sn基合金的硬化和耐热性

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摘要

Mg-Sn-based alloys are considered as a promising precipitation-hardening system for applications at elevated temperatures, but the hardening effect is not satisfactory owing to sluggish nucleation and rapid coarsening of the major Mg_2Sn lath precipitates. In this study, Cu and Al are added to a Mg-6Sn-lMn base alloy. The age-hardening response and the microstructures of these modified alloys have been investigated and are compared to that of the base alloy. The additional elements are found to bring several beneficial effects to the alloys for applications at elevated temperatures. Firstly, a eutectic structure consisting of strong intermetallic phases, i.e. Mg_2Cu in the Mg-6Sn-lMn-2Cu alloy and Al_(0.93)Cu_(1.07)Mg in the Mg-6Sn-lMn-2Cu-2Al alloy, remains stable along the grain boundaries after solution and ageing heat treatments. Secondly, the precipitate density has been increased significantly and the precipitate size has been refined remarkably during ageing at 200 °C. Moreover, the growth of the precipitates is inhibited remarkably during the over-ageing period. Therefore, the age-hardening response and over-ageing resistance are notably improved.
机译：Mg-Sn基合金被认为是在高温下应用的有前途的沉淀硬化系统，但是由于缓慢的成核作用和主要的Mg_2Sn板条沉淀物的快速粗化，硬化效果不令人满意。在这项研究中，将Cu和Al添加到Mg-6Sn-1Mn基合金中。已经研究了这些改性合金的时效硬化响应和显微组织，并将其与基础合金进行了比较。发现附加元素对在高温下应用的合金具有多种有益作用。首先，由强金属间相组成的共晶组织，即Mg-6Sn-1Mn-2Cu合金中的Mg_2Cu和Mg-6Sn-1Mn-2Cu-2Al合金中的Al_（0.93）Cu_（1.07）Mg沿晶界保持稳定。固溶和时效热处理后的晶界。其次，在200°C时效过程中，沉淀物密度显着增加，沉淀物尺寸显着细化。而且，在过时效期间，沉淀物的生长被显着抑制。因此，显着改善了时效响应和抗老化性能。

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