ZA 27 alloys reinforced by Mn containing intermetallic compounds were prepared and the effect of Mn content on their mechanical properties were examined. By adding Mn, rare earth elements(RE) and Ti into ZA 27, experi...ZA 27 alloys reinforced by Mn containing intermetallic compounds were prepared and the effect of Mn content on their mechanical properties were examined. By adding Mn, rare earth elements(RE) and Ti into ZA 27, experimental alloys were fabricated by sand casting. The volume fraction, grain size and morphology of the Mn containing intermetallic compound phases vary with the changing of Mn content. Mechanical properties of the reinforced ZA 27 alloys at elevated temperatures were measured. The results show that the hardness, compressive strength and compressibility of experimental alloys increase with increasing Mn content until they reach a maximum at 0.5% Mn. Excessive and coarse hard phases would act as crack origins instead of dispersion strengthening particles. Best tensile properties of these alloys at elevated temperature can be achieved at a Mn content of 0.18 %.展开更多
文摘ZA 27 alloys reinforced by Mn containing intermetallic compounds were prepared and the effect of Mn content on their mechanical properties were examined. By adding Mn, rare earth elements(RE) and Ti into ZA 27, experimental alloys were fabricated by sand casting. The volume fraction, grain size and morphology of the Mn containing intermetallic compound phases vary with the changing of Mn content. Mechanical properties of the reinforced ZA 27 alloys at elevated temperatures were measured. The results show that the hardness, compressive strength and compressibility of experimental alloys increase with increasing Mn content until they reach a maximum at 0.5% Mn. Excessive and coarse hard phases would act as crack origins instead of dispersion strengthening particles. Best tensile properties of these alloys at elevated temperature can be achieved at a Mn content of 0.18 %.
