摘要
利用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射(XRD)仪、维氏硬度仪和电子拉伸试验机等分析测试方法,系统地研究了Fe元素含量变化对Ti-x Fe-B(x=1%~5%,质量分数)合金铸态组织演变及力学性能的影响。结果表明:在Fe含量1%~3%时,合金组织由片层状α相和少量β相组成,当Fe含量增加至4%~5%时,合金组织的组成中β相增加显著,同时随着Fe含量从1%增至5%,析出化合物中Fe元素含量上升,α相晶粒尺寸下降了56.5%;随着Fe含量增加,合金力学性能改变显著,维氏硬度增加了45.7%,抗拉强度由502 MPa增加至834 MPa,且合金塑性下降明显,断面收缩率从30.4%下降至9.5%,断裂伸长率由19.4%下降到7.9%。结果显示,当Fe含量在3%~4%时,合金可以达到强度和塑性的最佳匹配,具有更大的开发潜力。
The effect of Fe content on microstructure evolution and mechanical properties of as-cast Ti-x Fe-B(x=1~5,wt%) alloy was investigated by optical microscopy(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD),Vickers hardness tester and electronic tensile testing machine.The results show that when the Fe content is below 3 wt%,the structure of as-cast Ti-x Fe-B alloy is mainly α lamellar.With the increase of Fe content,the β phase increases significantly,Meanwhile,with increasing Fe content from 1 wt% to 5 wt%,the precipitation of Fe in compound increases,grain size of α-phase decreases by 56.5%.It is found that mechanical properties of as-cast alloy are significantly improved by the addition of Fe into Ti B alloy.With the increase of Fe content,Vickers hardness of as-cast alloy is increased by 45.7%,and the tensile strength increased from 502 MPa to 834 MPa.However,the ductility of Ti-x Fe-B alloy decreases significantly,reduction rate decreases from 30.4% to 9.5%,and elongation at break long rate falls from 19.4% to 7.9%.The results show that when the Fe content is in the range of 3 wt%~ 4 wt%,the alloy can achieve the best match between strength and plasticity with greater potential for development.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2017年第S1期180-184,共5页
Rare Metal Materials and Engineering
关键词
Fe含量
钛合金
低成本
铸态组织演变
力学性能
Fe content
low cost
cast alloy microstructure evolution
mechanical properties
