Mechanical Properties of Newly Developed Age Hardenable Mg-3.2 mol%Gd-0.5 mol%Zn Casting Alloy
Mechanical Properties of Newly Developed Age Hardenable Mg-3.2 mol%Gd-0.5 mol%Zn Casting Alloy
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DOI：
10.2320/matertrans.l-mra2008830
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发表时间：
2008-10
影响因子：
1.2
通讯作者：
T. Ozaki;Yasunori Kuroki;Kentaro Yamada;H. Hoshikawa;S. Kamado;Y. Kojima
中科院分区：
文献类型：
--
作者：
T. Ozaki;Yasunori Kuroki;Kentaro Yamada;H. Hoshikawa;S. Kamado;Y. Kojima
研制了一种新型Mg-Gd-Zn基高强度铸造合金。研究了Zn含量对合金显微组织和抗拉强度的影响。Mg-3.2%Gd-0.5%Zn-0.2%Zr（mol%，0.5GZ）和Mg-3.2%Gd-0.75%Zn-0.2%Zr（0.75GZ）合金均表现出与Mg-Gd-Y-Zr合金相似的bco结构的β 0相析出，从而产生显著的时效硬化。合金中的析出相比添加Zn和大量Gd的Mg-Gd-Y-Zn-Zr合金中的析出相更细小、更致密。固溶处理后，Mg3 Gd化合物颗粒仍留在晶界。长周期堆垛有序相（LPSO）没有形成。据认为，Mg3 Gd颗粒抑制了热处理期间的晶粒粗化，并提供了直径约30 mm的细晶粒结构。经T6处理的0.5GZ合金室温抗拉强度为410 MPa，在473 K时仍保持较高的强度。[doi：10.2320/材料trans. L-MRA 2008830]
A new Mg-Gd-Zn-base cast alloy was developed for high strength casting products. Effects of Zn content on microstructures and tensile strength were investigated. Both Mg-3.2%Gd-0.5%Zn-0.2%Zr (in mol%, 0.5GZ) and Mg-3.2%Gd-0.75%Zn-0.2%Zr (0.75GZ) alloys showed remarkable age hardening by precipitation of � 0 phase with bco structure as similar to Mg-Gd-Y-Zr alloy. The precipitates are finer and denser than those of Mg-Gd-Y-Zn-Zr alloy by Zn and a large amount of Gd addition. Mg3Gd compound particles remained at grain boundaries after solution treatment. Long period stacking ordered (LPSO) phase did not form. It is considered that Mg3Gd particles suppressed grain coarsening during the heat treatment, and provided fine grain structure of about 30 mm in diameter. Tensile strength of the T6-treated 0.5GZ alloy was 410 MPa at room temperature and the high strength was kept by 473 K. [doi:10.2320/matertrans.L-MRA2008830]