Mg-Gd-Nd-ZrおよびMg-Dy-Nd-Zr合金の時効特性および引張特性
Mg-Gd-Nd-ZrおよびMg-Dy-Nd-Zr合金の時効特性および引張特性
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DOI：
10.2464/jilm.44.555
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发表时间：
1994-10
期刊：
影响因子：
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通讯作者：
祐司 根岸;卓寛 西村;秀紀 岩澤;重晴 鎌土;陽 小島;隆二 二宮
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作者：
祐司 根岸;卓寛 西村;秀紀 岩澤;重晴 鎌土;陽 小島;隆二 二宮
本研究熔炼了含有锆作为晶粒细化剂的Mg-10mass%Gd或Dy-2或3mass%Nd合金，以进一步改善各种性能。研究了这些合金在 350°C 以下的时效特性和拉伸性能。通过添加 2 或 3mass%Nd 和 Zr，峰值时效硬度变得更高，并且在 Mg-Gd 合金中高达 275°C 时显示出明显的时效硬化，在 Mg-Dy 合金中高达 250°C 时显示出明显的时效硬化。根据透射电子显微镜的结果，发现显着的时效硬化是由具有D019晶体结构的亚稳β“相析出引起的。Mg-10mass％Gd-3mass％Nd-Zr合金在所有测试的合金中具有最高的强度，其在200和250℃下的极限拉伸强度分别为310MPa和300MPa。此外，Mg-10mass％Gd-3mass％Nd-Zr合金的强度最高，其在200℃和250℃时的极限拉伸强度分别为310MPa和300MPa。 Mg-10mass%Gd-3mass%Nd-Zr合金在250℃时的强度为155MPa/(Mg/m3)，比WE54A合金高30MPa/(Mg/m3)。Mg-Dy合金的强度低于含Gd合金，但表现出更高的延展性。
In this study, Mg-10mass%Gd or Dy-2 or 3mass%Nd alloys containing zirconium as a grain refinement agent were melted for the purpose of further improvements of various properties. Aging characteristics and tensile properties up to 350°C of these alloys were investigated. Hardness at peak-aging becomes higher by the additions of 2 or 3mass%Nd and Zr, and pronounced age hardening is shown up to 275°C in Mg-Gd alloys and up to 250°C in Mg-Dy alloys. The remarkable age hardening is found to be caused by the precipitation of the metastable β"-phase with a D019 Crystal structure based on the results obtained by a transmission electron microscope. The Mg-10mass%Gd-3mass%Nd-Zr alloy has the highest strength in all examined alloys, and its ultimate tensile strength at 200 and 250°C are 310MPa and 300MPa respectively. Furthermore, specific strength of the Mg-10mass%Gd-3mass%Nd-Zr alloy at 250°C is 155MPa/(Mg/m3) and is higher by 30MPa/(Mg/m3) than that of the WE54A alloy. The Mg-Dy alloys are inferior to the Gd-bearing alloys in strength, but exhibit more ductility.