(1. 太原理工大學(xué) 材料科學(xué)與工程學(xué)院，太原 030024；
2. 太原理工大學(xué) 教育部新材料界面與工程重點實驗室，太原 030024)
摘 要: 通過金相顯微鏡、SEM和XRD觀察研究擠壓態(tài) AZ31-xNd鎂合金的微觀組織和析出相，并測試合金的室溫和高溫力學(xué)性能。結(jié)果表明：Nd 在合金中以Al2Nd和Mg12Nd化合物形式存在，且隨著Nd量的增加，其數(shù)量增加；Nd使合金的晶粒細化、室溫和高溫性能提高。加入0.6% Nd 的合金晶粒尺寸由未加 Nd時的26 μm降至約10 μm，加入0.6% Nd合金的室溫抗拉強度、屈服強度和伸長率分別為 325 MPa、247 MPa和18.1%。含Nd合金的抗拉強度和屈服強度隨溫度升高而下降，而伸長率隨溫度的升高而增加。
關(guān)鍵字: 鎂合金；AZ31合金；擠壓；微觀組織；力學(xué)性能
（1. College of Materials Science and Engineering，Taiyuan University of Technology, Taiyuan 030024, China;
2. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education,
Taiyuan University of Technology, Taiyuan 030024, China）
Abstract:The microstructures and precipitated phases of as-extruded AZ31 magnesium alloy were studied by OM, SEM and XRD. The mechanical properties of the alloys at room temperature and high temperature were also tested. The results show that the addition of Nd results in the formation of Al2Nd and Mg12Ng phases in the matrix and the grain refinement in AZ31 alloy, and the amounts of Al2Nd and Mg12Nd phases increase with the increase of Nd addition. The mechanical properties at room temperature and high temperature are improved significantly due to the precipitation of second phases and grain refinement. The average grain size of alloy changes from 26 μm without Nd to 10 μm when added 0.6% Nd. The tensile strength, yield strength and elongation of as-extruded AZ31 alloy with 0.6% Nd are 325 MPa, 247 MPa and 18.1% at room temperature. The tensile strength and yield strength of alloy with Nd decrease, but the elongation increases with increasing temperature.
Key words: magnesium alloy; AZ31 alloys; extrusion; microstructure; mechanical properties
