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采用光学显微镜、X射线衍射仪、扫描电子显微镜等研究了Al-8Ti-2C中间合金对ZM-5合金显微组织及力学性能的影响,以及保温时间对合金力学性能的影响。结果表明:Al-8Ti-2C中间合金的主要相组成为Al4C3、TiC和α-Al,对ZM-5合金具有明显的细化效果。添加0.3%的Al-8Ti-2C中间合金时,细化效果最佳,α-Mg晶粒明显细化,平均晶粒尺寸由原来的124μm降低到约89μm;合金的综合力学性能最佳,其中抗拉强度和屈服强度分别比未变质的ZM-5合金提高了8.8%和24.2%,但伸长率提高幅度不大。此外,随着保温时间延长,ZM-5合金的力学性能先提高后降低。
The effects of Al-8Ti-2C master alloy on the microstructure and mechanical properties of ZM-5 alloy and the effect of holding time on the mechanical properties of ZM-5 alloy were studied by optical microscope, X-ray diffraction and scanning electron microscopy. The results show that the main phases of Al-8Ti-2C master alloy are Al4C3, TiC and α-Al, which have obvious thinning effect on ZM-5 alloy. When adding 0.3% Al-8Ti-2C master alloy, the refining effect is the best, the α-Mg grains are obviously refined, the average grain size is reduced from 124μm to about 89μm; the mechanical properties of the alloy are the best, The tensile strength and yield strength increased by 8.8% and 24.2% respectively compared with unmodified ZM-5 alloy, but the elongation increased little. In addition, the mechanical properties of ZM-5 alloy firstly increase and then decrease with the increase of holding time.