摘要
采用金相显微镜(OM)、场发射扫描电子显微镜(FESEM)、原子力显微镜(AFM)以及背散射电子衍射(EBSD),研究了含0.2%Zr和0.6%Sc的Al-Si-Mg-Cu-Zr-Sc合金中初生Al3 (Sc,Zr)相的形成及其细化合金铸态组织的机制。结果表明:Al-Si-Mg-Cu-Zr-Sc合金熔体在凝固过程中析出了初生Al3(Sc,Zr)相,由于其与基体的结构和生长取向相近,作为非均匀形核的核心使合金组织显著细化,并使合金铸态组织从粗大的树枝晶转变为细小的等轴晶。初生Al3(Sc,Zr)相以α-Al为核心生长,形成了"α-Al+Al3(Sc,Zr)+α-Al+Al3(Sc,Zr)+…"的偶数层共晶结构。
The mechanism whereby primary Al3(Sc,Zr) phase formed in Al-Si-Mg-Cu-Zr-Sc with 0.2% Zr and0.6% Sc as well as the mechanism whereby it rendered structure of the as-cast Al-Si-Mg-Cu-Zr-Sc alloy finer were investigated by means of OM,FESEM,AFM and EBSD.It was seen that the primary Al3(Sc,Zr) phase was precipitated from the Al-Si-Mg-Cu-Zr-Sc alloy melt during solidification,and because its structure and orientation were similar to those of the matrix,acted as the nucleus for heterogeneous nucleation thus significantly to refine structure of the alloy,and caused as-cast microstructure of the alloy to transform from coarse columnar crystals into equiaxed crystals.The primary Al3(Sc,Zr) phase grown with α-Al as nucleus with the result that an even numbered-layer eutectic structure of(α-Al+Al3(Sc,Zr)+α-Al+Al3(Sc,Zr)+…) formed.
作者
张雅
陈建彬
吴敏
ZHANG Ya;CHEN Jianbin;WU Min(Anhui Tianhang Mechanical and Electrical Co.,Ltd.,Wuhu 241000,Anhui China)
出处
《热处理》
CAS
2020年第4期17-21,共5页
Heat Treatment
