Improving flame resistance and mechanical properties of magnesium-silver-calcium sheet alloys by optimization of calcium content
Improving flame resistance and mechanical properties of magnesium-silver-calcium sheet alloys by optimization of calcium content
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DOI：
10.1016/j.jallcom.2020.155551
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发表时间：
2020-10-05
影响因子：
6.2
通讯作者：
Chino, Yasumasa
中科院分区：
文献类型：
--
作者：
Bian, Mingzhe;Huang, Xinsheng;Chino, Yasumasa
低阻燃性和低力学性能是制约变形镁合金作为结构件应用的关键问题。为了解决这些问题，本作者试图开发一种具有优异的室温（RT）成形性的阻燃镁-银基板材合金。发现Mg-1.5 wt%Ag-x wt.%随着Ca含量增加到2wt%，Ca合金的含量显著增加。由于在表面上形成致密的Ca 0膜，含2重量% Ca的合金在1000 ℃时表现出不可燃性特性。强度和面内屈服各向异性随着Ca含量的增加而增强，这主要与Mg 2Ca第二相颗粒的细化和致密分布有关。相反，拉伸成形性随着Ca含量的增加而降低，这是由于Mg 2Ca颗粒的数量增加。成分优化的Mg-1.5Ag-1Ca（wt.%）合金显示出912.5 ℃的高燃点，在RT下具有7.8 mm的大指数埃里克森值。（C）2020 Elsevier B. V.保留所有权利。
Low flame resistance and inferior mechanical properties are critical issues in widening applications of wrought magnesium alloys as a structural component. To address these issues, the present authors attempted to develop a flame-resistant magnesium-silver-based sheet alloy with excellent room temperature (RT) formability. It was found that the ignition temperature of Mg-1.5 wt%Ag-x wt.%Ca alloy was significantly increased with increasing the Ca content up to 2 wt%. The 2 wt% Ca-containing alloy exhibited a non-flammability characteristic upon 1000 degrees C due to the formation of compact and dense Ca0 film on the surface. Strength and in-plane yield anisotropy were enhanced with increasing the Ca content, which were mainly associated with a finer microstructure and a denser distribution of Mg2Ca second phase particles. In contrast, stretch formability was decreased with increasing the Ca content due to an increased number of the Mg2Ca particles. A compositionally optimized Mg-1.5Ag-1Ca (wt.%) alloy showed a high ignition temperature of 912.5 degrees C with a large index Erichsen value of 7.8 mm at RT. (C) 2020 Elsevier B.V. All rights reserved.