Effects of Ca additions on the microstructural stability and mechanical properties of Mg-5%Sn alloy
Effects of Ca additions on the microstructural stability and mechanical properties of Mg-5%Sn alloy
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DOI：
10.1016/j.matdes.2010.09.019
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发表时间：
2011-03-01
影响因子：
8.4
通讯作者：
Mahmudi, R.
中科院分区：
文献类型：
--
作者：
Nayyeri, G.;Mahmudi, R.
镁锡基合金在铸态条件下形成了热稳定的镁锡相，具有很大的高温应用潜力。为了进一步提高合金的力学性能，在镁-5%锡合金中分别加入0.7%、1.4%和2%质量分数的钙。加入钙后，基合金的枝晶组织得到细化。结果表明，在所有试验材料中，镁-5%锡-2%钙合金具有最高的硬度、强度和蠕变抗力。这是由于在所研究的体系中，作为主要增强剂的CaMgSn2相粒子的体积分数较高。结果还表明，虽然长期的退火处理软化了基镁合金，但含钙材料的硬度和强度变化不大，表明CaMgSn金属间化合物粒子成功地提高了材料的组织稳定性。(C)2010爱思唯尔有限公司。保留所有权利。
Mg-Sn based alloys have great potential for high temperature applications because of the formation of the thermally stable Mg2Sn phase in the as-cast condition. In the present investigation, for further enhancement of the mechanical properties, 0.7, 1.4 and 2 wt.% of Ca was added to the base Mg-5%Sn alloy. The dendritic structure of the base alloy was refined after the addition of Ca. It was found that the Mg-5%Sn-2%Ca alloy had the highest hardness, strength, and creep resistance among all tested materials. This is attributed to the higher volume fraction of CaMgSn second phase particles which act as the main strengthening agent in the investigated system. Results also showed that while long-term annealing treatment softened the base Mg-5Sn alloy, there was not much change in the hardness and strength of the Ca-containing materials, implying that CaMgSn intermetallic particles have successfully increased the microstructural stability of the materials. (C) 2010 Elsevier Ltd. All rights reserved.