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利用传统的熔铸法制备Mg-14.28Gd-2.44Zn-0.54Zr合金,研究铸态和固溶态合金的微结构。利用销-盘装置研究铸态和固溶态合金的室温润滑滑动摩擦磨损行为研究。在外载荷为40 N,滑动速度为30~300 mm/s以及滑行路程为5000 m情况下,测量磨损率和摩擦因数。研究结果表明:铸态合金主要由α-Mg固溶体、分布在基体内的层片状的14H型长周期结构(LPSO)和β-[(Mg,Zn)3Gd]相组成。经过温度为773 K固溶处理35 h后,大量的β相转变成具有14H型X相LPSO结构。由于固溶处理后大量β相转变为热稳定的韧性X-Mg12Gd Zn长周期结构相,固溶合金呈现较低的抗磨损能力。
The Mg-14.28Gd-2.44Zn-0.54Zr alloy was prepared by the traditional casting method and the microstructure of as-cast and solid-solution alloys was studied. Study on Lubrication, Sliding Friction and Wear Behavior of Cast and Solid Solution Alloys at Room Temperature by Pin - Disk Assembly. With an external load of 40 N, a sliding speed of 30 to 300 mm / s and a taxiway of 5000 m, wear rates and friction factors were measured. The results show that the as-cast alloy is mainly composed of α-Mg solid solution, lamellar 14H long period structure (LPSO) and β - [(Mg, Zn) 3Gd] phase distributed in the matrix. After the solution treatment at 773 K for 35 h, a large amount of β phase was transformed into a 14H-type X-phase LPSO structure. Due to the large amount of β phase transformed into the thermostable ductile X-Mg12Gd Zn long-period structure phase after solution treatment, the solid solution alloy exhibits a lower anti-wear ability.