CAJ | 학술논문

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-Mg12GdZn长周期结构相，固溶合金呈现较低的抗磨损能力。
이용전통적용주법제비 Mg?14.28Gd?2.44Zn?0.54Zr 합금，연구주태화고용태합금적미결구。이용소?반장치연구주태화고용태합금적실온윤활활동마찰마손행위연구。재외재하위40 N，활동속도위30~300 mm/s이급활행로정위5000 m정황하，측량마손솔화마찰인수。연구결과표명：주태합금주요유α-Mg고용체、분포재기체내적층편상적14H형장주기결구(LPSO)화β-[(Mg,Zn)3Gd]상조성。경과온도위773 K고용처리35 h후，대량적β상전변성구유14H형X상 LPSO결구。유우고용처리후대량β상전변위열은정적인성X-Mg12GdZn장주기결구상，고용합금정현교저적항마손능력。
A Mg?14.28Gd?2.44Zn?0.54Zr (mass fraction, %) alloy was prepared by conventional ingot metallurgy (I/M). The microstructure differences in as-cast and solution-treated alloys were investigated. Sliding tribological behaviors of the as-cast and solution-treated alloys were investigated under oil lubricant condition by pin-on-disc configuration. The wear loss and friction coefficients were measured at a load of 40 N and sliding speeds of 30?300 mm/s with a sliding distance of 5000 m at room temperature. The results show that the as-cast alloy is mainly composed ofα-Mg solid solution, the lamellar 14H-type long period stacking ordered (LPSO) structure within matrix, andβ-[(Mg,Zn)3Gd] phase. However, most of theβ-phase transforms to X-phase with 14H-type LPSO structure after solution heat treatment at 773 K for 35 h (T4). The solution-treated alloy presents low wear-resistance, because the hard β-phase is converted into thermally-stable, ductile and soft X-Mg12GdZn phase with LPSO structure in the alloy.