摘要
通过真空电弧熔炼法制备了含不同量稀土元素Er的Al-12Si合金。采用金相显微镜、扫描电镜、X射线衍射、硬度测试仪对其组织形貌、物相分布及力学性能进行了研究。结果表明：向Al-12Si合金中加入稀土元素Er后,合金的晶粒得到细化,片状共晶硅转变为短棒状,在晶界处析出第二相粒子Al3Er,起到弥散强化效果。该合金的硬度、抗拉强度明显提高。Er质量分数为0.2%时,合金具有最佳的综合力学性能。与未添加稀土元素相比,该合金的硬度提高24%,抗拉强度提高近30%,合金断口出现少量韧窝,断裂方式由脆性解理断裂转变为混合型断裂。
Al-12 Si alloys with different contents of rare earth elements（Er） were prepared by vacuum arc melting. The microstructure, phase distribution and mechanical properties of the alloy were studied by metallographic microscope, scanning electron microscope, X ray diffraction and hardness tester. The results show that the grain of the alloy is refined after adding rare earth element Er. The flaky eutectic silicon transforms into short bar, and the second particles Al3 Er precipitate at the grain boundary, and the dispersion strengthening effect is achieved. The hardness and tensile strength of the alloy obviously improves. When the mass fraction of Er is 0.2%, the alloy has the best comprehensive mechanical properties. Compared with the alloy without rare earth elements, the hardness of the alloy increases by 24%, the tensile strength increases by nearly 30%,and then, a small number of dimples appear in the fracture of the alloy, and the fracture mode changes from brittle cleavage fracture to mixed fracture.
作者
朱胜
邱六
王晓明
陈永星
王瑞
ZHU Sheng;QIU Liu;WANG Xiaoming;CHEN Yongxing;WANG Rui(National Key Laboratory for Remanufacturing,Army Academy of Arrmored Forces,Beijing 100072,China;Nanjing Military Representative Bureau of Army,Nanjing 210000,China)
出处
《热加工工艺》
CSCD
北大核心
2018年第18期78-81,共4页
Hot Working Technology
关键词
铝硅合金
稀土元素
组织
力学性能
Al-Si alloy
rare earth element
microstructure
mechanical properties
