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采用金属型铸造制备了Mg_(97)Ni_1Gd_1Nd_1(摩尔分数)合金,并采用光学显微镜、X射线衍射仪(XRD)、扫描电镜(SEM)和力学试验等研究了合金的铸态组织和力学性能。结果表明,Mg_(97)Ni_1Gd_1Nd_1合金铸态组织主要由树枝状α-Mg和分布于枝晶间的长周期结构相组成;合金室温和300℃时的屈服强度、抗拉强度和伸长率分别为139 MPa、163 MPa、1.7%和131 MPa、192 MPa、6.7%,而300℃抗拉强度优于室温,呈现力学性能温度反常现象;合金室温压缩屈服强度、抗压强度和压缩塑性分别为159 MPa、364 MPa和14.9%,其压缩屈服强度高于拉伸强度,表现出室温屈服拉压不对称性。
The alloy Mg_ (97) Ni_1Gd_1Nd_1 (mol fraction) was prepared by metal casting. The as - cast microstructure and mechanical properties of the alloy were investigated by optical microscope, XRD, SEM and mechanical tests. The results show that the as-cast microstructure of Mg_ (97) Ni_1Gd_1Nd_1 alloy is mainly composed of dendritic α-Mg and long-period structure phase distributed between dendrites. The yield strength, tensile strength and elongation at room temperature and 300 ℃ are 139 MPa, 163 MPa, 1.7% and 131 MPa, 192 MPa and 6.7%, respectively. However, the tensile strength at 300 ℃ was better than room temperature, showing anomalous mechanical properties. The room temperature compressive yield strength, compressive strength and compressive plasticity were 159 MPa, 364 MPa and 14.9%, respectively. The compressive yield strength is higher than that of tensile strength, which shows the asymmetric tensile strength and tensile strength at room temperature.