摘要
采用电弧熔炼法制备17个不同成分的Ti-Al-Nb三元合金样品,在1 100℃退火1 080 h后取出,在冰水中淬火。利用扫描电镜(SEM)、电子探针(EPMA)和X射线衍射(XRD)等手段对退火后的合金样品进行分析,研究Ti-Al-Nb三元系1 100℃等温截面,确定该截面下(Al摩尔分数为0~75%成分区间)的9个单相区、15个两相区和7个三相区,并与Witusiewicz与Cupid的优化计算结果进行比较。结果表明,本研究所得1 100℃等温截面的Al摩尔分数为30%~60%的成分区间与Witusiewicz和Cupid的计算结果存在明显差异。采用实验方法确定了Ti-Al-Nb三元系1 100℃等温截面与计算结果不同的α2+β+γ和β+γ+σ两个三相区以及β+γ两相区。
Seventeen Ti-Al-Nb alloy samples were prepared by arc melting,annealing at 1 100℃for 1 080 h,quenching in ice water.Isothermal section of Ti-Al-Nb ternary system at 1 100℃were studied using X-ray diffraction(XRD),scanning electron microscopy(SEM)and electron probe microanalysis(EPMA).Nine single-phase regions,fifteen two-phase regions and seven three-phase regions under the section(0?75%Al composition interval)were identified.The results show that,compared with the isothermal section of 1 100℃obtained from the optimized calculation results of Witusiewicz and Cupid,there is a significant difference between experimental results(30?60%Al composition intervals)and the calculated results.The experimental results show that two three-phaseα2+β+γandβ+γ+σregions and a two-phaseβ+γregion of the isothermal section of 1 100℃are different from the calculated results.
作者
李林
刘立斌
章立钢
LI Lin;LIU Libin;ZHANG Ligang(School of Materials Science and Engineering,Central South University,Changsha 410083,China)
出处
《粉末冶金材料科学与工程》
EI
北大核心
2018年第4期341-346,共6页
Materials Science and Engineering of Powder Metallurgy
基金
科技部重大专项(2016YFB0701301)
