Characterization of phases in Mg–4Y–4Sm–0.5Zr alloy processed by heat treatment
Characterization of phases in Mg–4Y–4Sm–0.5Zr alloy processed by heat treatment
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DOI：
10.1016/j.msea.2006.05.011
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发表时间：
2006-07
期刊：
影响因子：
6.4
通讯作者：
Da-quan Li;Qudong Wang;W. Ding
中科院分区：
文献类型：
--
作者：
Da-quan Li;Qudong Wang;W. Ding
对Mg-4 Y-4Sm-0.5Zr合金进行了798 K × 8h固溶和448、473、498 K人工时效处理。利用透射电镜和薄箔能谱仪研究了Mg-4 Y-4Sm-0.5Zr合金热处理过程中的相组成。Mg 5（Sm0.6Y0.4）共晶相为面心立方结构（a=2.326nm）。在固溶状态下，在晶界附近发现了具有面心立方结构（a=0.5581nm）的方晶相。在峰值时效状态下起重要作用的细小板状析出相被确定为β′。峰值时效态的抗拉强度为337 MPa，屈服强度为220 MPa，延伸率为3.7%。
Heat treatments consisting of solution at 798K for 8h and artificial ageing at 448, 473 and 498K were carried out on Mg–4Y–4Sm–0.5Zr alloy. Characterization of phases in Mg–4Y–4Sm–0.5Zr alloy during heat treatments has been investigated, using transmission electron microscopy and thin foil energy dispersive X-ray spectroscopy. The eutectic phase with composition of Mg5(Sm0.6Y0.4) has an fcc crystal structure (a=2.326nm). The quadrate phase with an fcc crystal structure (a=0.5581nm) was found near grain-boundaries in the solution-treated state. The fine plate-shaped precipitate phase which was found to play an important role in the peak-aged state was determined as β′. The ultimate tensile strength of 337MPa, yield strength of 220MPa and elongation of 3.7% are attained in the peak-aged state.