论文部分内容阅读
采用了团簇加连接原子模型描述了Mg-Al-Ce固溶体中的近程有序结构,构建了该类合金的理想成分式[(Al,Ce)_1-Mg_(12)]Mg_1,并据此设计了成分为[(Al_(0.925)Ce_(0.075))-Mg_(12)]Mg_1(Mg_(92.86)Al_(6.61)Ce_(0.54),at%;Mg-7.1Al-3.0Ce,mass%)的ACe73合金,通过永久模重力铸造(PM)工艺获得铸态合金。结果表明:合金显微组织为α-Mg基体中均匀分布着大量不连续的β-Mg17Al11相和针状Al_(11)Ce_3相,拉伸实验测得该合金抗拉强度为210 MPa,屈服强度为99.3 MPa,伸长率为9.0%,相比于其他PM工艺制备的Mg-Al-Ce铸态合金,强度最高。
The ordered and ordered structure of the Mg-Al-Ce solid solution was described by using the cluster-connected atom model and the ideal compositional formula [(Al, Ce) _1-Mg_ (12)] Mg_1 was established. The results show that the composition of [(Al_ (0.925) Ce_ (0.075)) - Mg_ (12) Mg_1 (Mg 92.86 Al 6.61 Ce 0.54, at%; ) Of ACe73 alloy obtained by a permanent mold gravity casting (PM) process cast alloy. The results show that a large amount of discontinuous β-Mg17Al11 phase and acicular Al 11 Ce 3 phase are uniformly distributed in the α-Mg matrix. Tensile test shows that the tensile strength of the alloy is 210 MPa, the yield strength Is 99.3 MPa and the elongation is 9.0%. Compared with Mg-Al-Ce cast alloy prepared by other PM process, the strength is the highest.