摘要
通过铸锭冶金及形变热处理工艺,制备了含0.3%Sc的Mg-11Al-1.2Zn(质量分数)合金。采用X射线衍射、金相及扫描电镜观察与拉伸性能测试,研究微量钪在基体合金中的作用与存在形式。结果表明,基体合金中添加0.3%Sc后,合金的晶粒明显得到细化,Mg17Al12相的形态与分布得到有效改善。合金的相组成主要由α-Mg基体相、Mg17Al12相及MgAlSc相组成。同时,0.3%Sc的添加也提高了挤压态合金在室温与高温下抗拉强度,室温时的抗拉强度达到340MPa,而伸长率超过了10%。
Mg-Al-Zn alloys with trace scandium were prepared by ingot metallurgy and thermo-mechanical treatment. The effects of scandium addition on the microstructure and mechanical of the alloys have been investigated by using of X-ray diffraction, optical microscope, scanning electron microscopy and tensile testing. It has been shown that the alloy structure is mainly composed of phase α -Mg, Mg17Al12 and MgAISc when 0.3%Sc was added. The 0.3%Sc addition improves the morphology and distribution of Mg17Al12 phases. Such improved microstructure is accompanied by the improvement of mechanical properties of the extruded alloy at room temperature and high temperature. At this condition, the tensile strength and elongation of the alloy with 0.3%Sc are 340 MPa and above 10% at the room temperature.
出处
《铸造》
CAS
CSCD
北大核心
2008年第9期946-949,共4页
Foundry
基金
中国博士后科学基金(20070410986)
关键词
镁-铝-锌合金
钪
显微组织
力学性能
Mg-Al-Zn alloys
scandium
microstructure
mechanical properties
