Microstructure and mechanical properties of WE43 magnesium alloy fabricated by direct-chill casting
Microstructure and mechanical properties of WE43 magnesium alloy fabricated by direct-chill casting
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直冷铸造WE43镁合金的显微组织与力学性能
DOI：
10.1016/j.msea.2016.11.009
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发表时间：
2017-01-27
期刊：
影响因子：
6.4
通讯作者：
Luo, J. H.
中科院分区：
文献类型：
--
作者：
Jiang, H. S.;Zheng, M. Y.;Luo, J. H.
采用直冷铸造法成功制备了直径为500 mm的高质量WE 43镁合金铸锭。合金元素几乎均匀地分布在整个大铸锭上。随着平均晶粒尺寸从铸锭中心到边缘逐渐减小，力学性能逐渐提高。在525 ℃固溶处理8 h后，沿沿着分布的Mg 14 Nd 2 Y相充分溶解于基体中。直接激冷（DC）铸锭在250 ℃下进行T6处理后在85 Hv至117 Hv范围内表现出显著的时效硬化响应。T6峰时效试样的抗拉强度为274 MPa，屈服强度为215 MPa，延伸率为3.4%，均高于砂型铸造和金属型铸造的WE 43合金。在T6处理期间沉淀的大量纳米棱柱β '和β 1相有助于WE 43合金的改进的强度。
High quality WE43 magnesium alloy ingots with diameter of 500 mm are successfully fabricated by direct-chill (DC) casting. The alloying elements distributed almost homogeneously across the large ingot. With the average grain size decreasing from the center to the edge of the ingot, the mechanical properties are improved gradually. After solution treatment at 525 degrees C for 8 h, the Mg14Nd2Y phases distributing along the grain boundaries are well dissolved into matrix. The direct-chill (DC) casting ingot exhibits remarkable age-hardening response from 85 Hv to 117 Hv after T6 treatment at 250 degrees C. The T6 peak-aged sample exhibits ultimate tensile strength of 274 MPa, yield strength of 215 MPa and elongation to failure of 3.4%, which are higher than those of sand-cast and permanent mold cast WE43 alloys. The large amount of nano prismatic beta' and beta 1 phases precipitated during T6 treatment contribute to improved strength of the WE43 alloy.