摘要
研究了添加Zr元素的重力铸造AlSi7Mg0.4合金的微观组织和力学性能。结果表明,在含Zr的铸态合金中生成了(Al,Si)3(Zr,Ti)和π-Fe相,Zr的添加使合金的晶粒尺寸减小;经过T6热处理后富Fe相中的Mg和少量粗大的(Al,Si)3(Zr,Ti)相重溶到基体中,减小了金属间化合物的尺寸,生成了与基体有共格关系的含Zr析出相。含Zr合金的抗拉强度和伸长率达到332 MPa和8.7%,比不含Zr的合金分别提高了10%和90%。
Ingots of AlSi7 Mg0.4 alloys with 0.06%,0.14%and 0.20%Zr addition respectively were fabricated with gravity casting method.The microstructure analysis of the as-cast alloys shows that(Al,Si)3(Zr,Ti)andπ-Fe phases formed in these alloys.Compared with the AlSi7 Mg0.4 alloys without Zr,the grain size of the alloys containing Zr is smaller.Strengthening phase(Al,Si)3(Zr,Ti)precipitated in the alloys containing Zr during the solution treatment.After T6 heat treatment,a small amount of Mg in the Fe-rich intermetallics and a little part of coarse(Al,Si)3(Zr,Ti)phases re-dissolved into the matrix,which decreased the intermetallics sizes.The tensile strength and elongation of the alloys containing Zr are 332 MPa and 8.7%,which are 10%and 90%higher than the alloy without Zr,respectively.
作者
张云翔
赵海东
朱霖
李昌海
武汉琦
ZHANG Yunxiang;ZHAO Haidong;ZHU Lin;LI Changhai;WU Hanqi(National Engineering Research Center of Near-net-shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,China;CITIC Dicastal Co.Ltd.,Qinhuangdao 066011,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2021年第3期209-220,共12页
Chinese Journal of Materials Research
基金
广东省重点领域研发计划(2020B010186002)。
