(中北大學(xué) 材料科學(xué)與工程學(xué)院，太原 030051)
摘 要: 利用DSC、OM、SEM、EDS和力學(xué)性能測試研究Mg-11Gd-3.6Y-2Zn-0.6Zr(質(zhì)量分?jǐn)?shù)，%)合金的形變組織和變形態(tài)合金分別在T4、T5、T6處理下的組織和力學(xué)性能的變化。結(jié)果表明：T6處理對合金綜合力學(xué)性能的改善更有利。T6處理時，隨固溶溫度的增加，合金的綜合力學(xué)性能呈現(xiàn)先增大后減小的趨勢，其中，在(430 ℃, 8 h)+(225 ℃, 16 h)時，抗拉、屈服強度和伸長率均表現(xiàn)良好，分別為397 MPa、300 MPa和12%，強度比擠壓態(tài)分別提高了14.9%和28.8%，伸長率有所下降。T6處理的固溶溫度過高時，盡管組織更加均勻，但是由于層片狀和塊狀LPSO相的減少和晶粒長大，強度下降嚴(yán)重。
關(guān)鍵字: 變形鎂合金；固溶溫度；時效處理；顯微組織；力學(xué)性能
（School of Materials Science and Engineering, North University of China, Taiyuan 030051, China）
Abstract:The microstructure and mechanical properties of Mg-11Gd-3.6Y-2Zn-0.6Zr (mass fraction, %) magnesium alloy under the conditions of multi-directional forging, T4, T5, T6 treatment were investigated by DSC, OM, SEM, EDS and mechanical properties tests. The results show that T6 treatment is more beneficial to the improvement of comprehensive mechanical properties of the alloy. After T6 treatment, with the increase of solution temperature, the comprehensive mechanical properties of the alloy increase firstly and then decreases. And all of the ultimate tensile strength, yield strength and elongation performed well under T6(430 ℃, 8 h+225 ℃, 16 h) treatment reach 397 MPa, 300 MPa and 12%, respectively. The ultimate tensile strength and yield strength are increased by 14.9% and 28.8% compared with those of the as-forged alloy, respectively, and the elongation decrease. When the solution temperature of T6 treatment is too high, although the microstructure is more uniform, the strength decreases seriously due to the reduction of lamellar and the block-like LPSO phase, and the grain size increases.
Key words: wrought magnesium alloy; solution temperature; aging treatment; microstructure; mechanical properties
