摘要
采用OM、XRD和SEM等测试手段研究了Al-0.5B-0.7C中间合金对ZM-5合金组织及性能的影响,以及保温时间对合金力学性能的影响。结果表明:Al-0.5B-0.7C中间合金的相组成为Al4C3、Al3BC和α-Al。与变质剂Al-8Ti-2C相比,Al-0.5B-0.7C中间合金对ZM-5合金具有更好的组织细化效果和更高的力学性能。添加0.1%Al-0.5B-0.7C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65μm;合金的综合力学性能最佳,其中抗拉强度、屈服强度和伸长率分别比未变质的ZM-5合金提高了17.3%、27.9%和57.1%。此外,随着保温时间的延长,ZM-5合金的力学性能先提高后降低。
The optical microscope, X-ray diffractometer and scanning electron microscope are employed to study the effect of Al-0.5B-0.7C on microstructures and properties of ZM-5 alloy, and effect of holding time on mechanical properties of the alloys. The results show that Al-0.5B-0.7C master alloy consisted ofAl4C3, Al3BC and α-Al phases. ZM-5 alloy with additions of Al-0.5B-0.7C master alloy has finer microstructures and higher mechanical properties compared to the alloy with addition of refiner Al-8Ti-2C. The optimum refinement can be obtained with 0.1% Al-0.5B-0.7C addition. The average grain size of α-Mg grain reduces from 124 μm to 65 μm; the mechanical properties of ZM-5 alloy reach optimum, its increment of tensile strength is 17.3%, that of yield strength is 27.9%, and that of elongation is 57.1%. In addition, the mechanical properties of ZM-5 alloy first raise and then decrease with the extension of holding time.
出处
《铸造》
CAS
CSCD
北大核心
2012年第10期1130-1134,共5页
Foundry
