The generation of Mg–Al–Zn alloys by semisolid state mixing of particulate precursors
The generation of Mg–Al–Zn alloys by semisolid state mixing of particulate precursors
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DOI：
10.1016/j.actamat.2004.07.011
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发表时间：
2004-10
期刊：
影响因子：
9.4
通讯作者：
F. Czerwinski
中科院分区：
文献类型：
--
作者：
F. Czerwinski
通过将AZ91D和AM60B机械粉碎前驱体在触变成型体系中进行半固态混合，制备了许多具有触变显微组织的Mg-Al-Zn合金。分析了显微组织的形成以及组织成分对合金强度、塑性和断裂行为的控制作用。结果表明，合金元素分配的不均匀性随加工温度的降低而加剧，液相分数受熔点较低的合金的影响较大。拉伸强度与相应的延伸率有很强的相关性，主要受微观组织中固体颗粒含量的控制，合金化学变化的影响可以忽略不计。延伸率受固含量和合金化学成分的共同影响，但前者的作用更大。各个前驱体对合金拉伸性能的贡献取决于加工温度。虽然接近完全融化，但两者的贡献几乎相等；随着温度的降低，与混合物规律的偏差增大，性能受熔点范围较低的前驱体的影响越来越大。
A number of Mg–Al–Zn alloys with thixotropic microstructures were created by the semisolid mixing of AZ91D and AM60B mechanically comminuted precursors in the Thixomolding®system. The microstructure formation was analyzed along with the role of structural constituents in controlling strength, ductility and the fracture behaviour of the created alloy. It was found that the inhomogeneity in the partition of alloying elements intensified with a reduction in the processing temperature and the liquid fraction was highly influenced by the alloy with the lower melting range. Tensile strength showed a strong correlation with corresponding elongations and was predominantly controlled by the solid particles’ content in the microstructure, with negligible influence derived from changes in the alloy’s chemistry. Although elongation was affected by both the solid content and the alloy’s chemical composition, a larger role was still exerted by the former. The contribution of individual precursors to the tensile properties of the created alloy depended on the processing temperature. While near to complete melting, both of them contributed almost equally; with a temperature reduction, the deviation from the rule of mixtures enlarged, and properties were increasingly influenced by the precursor with the lower melting range.