Effects of Sn addition on microstructure and mechanical properties of Mg-Zn-Al alloys
Effects of Sn addition on microstructure and mechanical properties of Mg-Zn-Al alloys
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Sn添加对Mg-Zn-Al合金显微组织和力学性能的影响
DOI：
10.1016/j.jallcom.2007.07.066
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发表时间：
2008-08-11
影响因子：
6.2
通讯作者：
Liao Kun
中科院分区：
文献类型：
--
作者：
Chen Jihua;Chen Zhenhua;Liao Kun
采用XRD、SEM和TEM等分析手段对添加Sn的Mg-6 Zn-2Al合金的铸态组织和相结构进行了表征。它们由α-Mg、MgZn和Mg 2Sn组成，Sn在0.5-3.0质量%的范围内，并且没有检测到三元相。Sn的加入抑制了共晶转变，细化了离异共晶。拉伸试验表明，少量Sn的加入有助于形成分散的短棒状Mg 2Sn颗粒，并提高常温和高温强度。但过量的Sn会导致Mg 2Sn颗粒粗化，从而导致强度和塑性下降。断口分析表明，准解理断裂是这些合金在室温和150 ℃下测试的主要机制。在室温和150 ℃时，随着Sn含量的增加，解理断裂和准解理断裂优先发生。(C)2007 Elsevier B. V.保留所有权利。
The microstructures and the phases of the as-cast Mg-6Zn-2Al alloys with Sn additions were characterized by XRD, SEM and TEM. They were composed of alpha-Mg, MgZn and Mg2Sn in the range of 0.5-3.0 mass% Sn, and no ternary phase was detected. The addition of Sn resulted in the suppression of the eutectic transformation and the refinement of divorced eutectics. The tensile tests showed that a minor addition of Sn contributed to the formation of the dispersed short rod-like Mg2Sn particles and the improvement in the ambient and elevated-temperature strength. However, excessive Sn addition led to the coarsening of Mg2Sn particles, and thus resulted in the decline of strength and plasticity. Fractographic analysis demonstrated that quasi-cleavage fracture was the dominant mechanism of these alloys tested at ambient temperature and 150 degrees C. Cleavage fracture and quasi-cleavage fracture were preferential at ambient temperature and 150 degrees C, respectively, with the increment of Sn. (C) 2007 Elsevier B.V. All rights reserved.