摘要
本文采用真空非自耗电弧熔炼炉制备NiAl-39V(%,原子分数)-0.05Dy(%,质量分数)-x Hf(%,原子分数)(x=0, 0.05, 0.1, 0.3, 1)系合金。利用X射线衍射仪(XRD)、光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)和Gleeble-1500D热模拟机分析合金相组成、组织及高温压缩性能。结果表明,不同Hf含量的合金均由NiAl/V共晶胞组成。随Hf含量的增加,共晶胞逐渐变小,共晶胞层片组织逐渐细化,晶界处失稳程度和晶胞间区域面积增加。Hf添加到0.3%后,共晶胞界析出富Hf相,增加到1%时,胞界处同时析出富Hf相和Ni2AlHf相,且富Hf相呈不连续状分布。Hf的添加,整体提高合金系高温强度,当Hf含量增加至1%时,合金高温压缩性能达到最高(360.18 MPa),其热激活能为36801.87 J·mol^(-1),较0 Hf合金激活能降低,高温压缩时最大应力所对应的最大应变向左偏移,动态再结晶易发生,共晶胞细化和Ni2AlHf的析出强化,导致高温压缩性能提升。
The experiment uses vacuum non-consumable arc smelting to prepare NiAl-39V(%,atom fraction)-0.05Dy(%,mass fraction)-xHf(%,atom fraction)(x=0,0.05,0.1,0.3,1)alloy.An X-ray diffractometer(XRD),an optical microscope(OM),a scanning electron microscope(SEM)with an energy spectrometer(EDS)and a Gleeble-1500D thermal simulator were used to analyze alloy phase composition,structure morphology and high temperature compression performance.The results show that the alloys with different Hf content are composed of NiAl/V eutectic cells.With the increase of Hf content,the eutectic cell gradually becomes smaller,the structure of the eutectic cell layer is gradually refined,the degree of instability at the grain boundary and the area between the cells increase.When Hf is added to 0.3%,Hf-rich phases are precipitated at the eutectic cell boundaries.When it is increased to 1%,Hf-rich phases and Ni2 AlHf are precipitated from the eutectic cells,and the Hf-rich phases are distributed in a discontinuous grid.The addition of Hf improves the high temperature strength of the alloy as a whole.When the Hf content increases to 1%(atom fraction),the alloy has the best high temperature compression performance(360.18 MPa),and the thermal activation energy is 36801.87 J·mol^(-1),which is lower than the activation energy of 0Hf,The maximum strain corresponding to the maximum stress during high-temperature compression shifts to the left,dynamic recrystallization is easy to occur,and the refinement of eutectic cell and the precipitation strengthening of Ni2 AlHf lead to the improvement of high temperature compression performance.
作者
郝彦超
张建飞
丁国
岑耀东
王东梅
白洋
刘小鱼
Alloy Hao Yanchao;Zhang Jianfei;Ding Guo;Cen Yaodong;Wang Dongmei;Bai Yang;Liu Xiaoyu(College of Materials Science and Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China;Center for New Rare-Earth Material Technology Research and Development Baotou,Baotou 014030,China)
出处
《中国稀土学报》
北大核心
2025年第5期1142-1149,共8页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(51564041)
内蒙古自然科学基金项目(2018MS05028,2022MS05019)
内蒙古科技大学基本科研业务费专项资金(2024RCTD016)资助。
