摘要
通过扫描电镜(SEM),能谱分析(EDS),X射线衍射(XRD)及电子背散射衍射分析(EBSD)等检测手段,探讨了添加合金元素Fe对Al-xTi(x=1,2,3)合金凝固组织及Al_(3)Ti相析出的影响。结果表明,在缓慢冷却和金属型铸造条件下,Fe元素均会促进Ti以Al_(3)Ti相的形式析出。在缓慢冷却条件下,随着Ti含量的增加,Al-xTi(x=1,2,3)合金中Al_(3)Ti相体积分数逐渐增大,呈长针状结构。而添加1%的Fe后,随着Ti含量的增加,Al_(3)Ti相由最初的块状和长针状逐渐转变为短棒状,最终转变为块状结构。在金属型铸造条件下,随着Ti含量的增加,Al-xTi(x=1,2,3)合金中Al_(3)Ti相由颗粒状转变为针状,且Al_(3)Ti相体积分数由3.37%增长至7.32%;添加1%的Fe后,随着Ti含量的增加,Al_(3)Ti相逐渐由块状转变为针状,且Al_(3)Ti相体积分数由4.47%增长至12.79%。添加Fe会促进Ti原子在Al基体中达到过饱和状态,进而促进Al_(3)Ti相的析出,Al_(3)Ti相会充分发挥异质形核作用,促进α-Al的形核,从而细化晶粒。
The effects of Fe addition on the solidification microstructure and Al_(3)Ti phase precipitation of Al-xTi(x=1,2,3,alloys were studied by means of scanning electron microscopy,energy dispersive spectroscopy,X-ray diffraction,and electron backscatter diffraction.The results indicated that Fe could greatly promote the precipitation of Ti in the form of a second phase under slow cooling and metal mold casting conditions.Under the condition of slow cooling,with the increase of Ti content,the volume fraction of the Al_(3)Ti phase increased gradually,and the Al_(3)Ti phase existed in the form of long needles in Al-xTi(x=1,2,3),alloys.After the addition of 1%Fe,with the increase of Ti content,the Al_(3)Ti phase gradually transformed from the initial block,long needle-like to short rod-like,and finally to block.Under the condition of metal mold casting,with the increase of Ti content,the Al_(3)Ti phase in the Al-xTi(x=1,2,3,alloy gradually transformed from granular to acicular,and the phase volume fraction increased from 3.37% to 7.32%.After adding 1%Fe,with the increase of Ti content,the Al_(3)Ti phase gradually transformed from block to acicular,and the phase volume fraction increased from 4.47% to 12.79%.The addition of Fe would promote the Ti atoms to reach a supersaturated state in the Al matrix,thus promoting the precipitation of the Al_(3)Ti phase.The Al_(3)Ti phase would give full play to the role of the heterogeneous nucleation core to promote the nucleation of α-Al and refine the grains.
作者
卞峒博
徐科男
林雪健
郑博文
申向阳
黄宏军
袁晓光
BIAN Tong-bo;XU Ke-nan;LIN Xue-jian;ZHENG BO-wen;SHEN Xiang-yang;HUANG Hong-jun;YUAN Xiao-guang(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,Liaoning,China;Avic Shenyang Xinghua Aero-Electric Appliance Co.,Ltd.,Shenyang 110144,Liaoning,China)
出处
《铸造》
2025年第1期42-53,共12页
Foundry
基金
营辽宁省教育厅基金(JYTMS20231200)
辽宁省自然科学基金联合基金(博士科研启动项目)(2023-BSBA-258)
国家自然科学基金资助项目(51875365)。
