定向凝固NiAl-32V亚共晶合金热稳定性研究  

Investigation on the Thermal Stability of Directionally Solidified NiAl-32V Hypoeutectic Alloy

作　　者：侯乐乐 张建飞[1] 郝彦超 李振亮[1] 陈林[1] 金自力[1] 任慧平[1,2,3] Hou Lele;Zhang Jianfei;Hao Yanchao;i Zhenliang;Chen Lin;in Zilil;Ren Huiping(College of Materials and Metallurgy(College of Rare Earth),Inner Mongolia University of Science and Technology,Baotou 014010,China;Key Laboratory of Inner Mongolia Advanced Metal Materials,Baotou 014010,China;Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学材料与冶金学院(稀土学院),内蒙古包头014010 [2]内蒙古新金属材料重点实验室,内蒙古包头014010 [3]内蒙古科技大学白云鄂博共伴生矿资源高效综合利用省部共建协同创新中心,内蒙古包头014010

出　　处：《稀有金属材料与工程》2022年第10期3859-3866,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51564041);内蒙古自然科学基金(2018MS05028)。

摘　　要：本工作采用定向凝固技术制备NiAl-32V伪二元亚共晶合金,研究了该合金在高温热处理后不同抽拉速率稳态区组织形貌,分析了其热稳定性及组织形貌变化规律。结果表明:该合金初生相组织在900℃(5~100 h)热稳定性良好;NiAl相共晶层片均有粗化与球化现象。不同温度(900、1000、1100℃)5 h高温热处理后,该合金初生相面积占比变化不大,所有试样(抽拉速率V=6~150μm/s)NiAl共晶层片均有粗化与球化现象;随着热处理温度的增加,粗化和球化现象愈明显。In this work, the NiAl-32V pseudo-binary hypoeutectic alloy was prepared by directional solidification technology. The microstructure morphology of the alloy in the steady-state region at different withdrawal rates after high temperature heat treatment was studied, and the variation of its thermal stability and microstructure morphology w ere analyzed. The results indicate that the primary phase of the alloy has good thermal stability at 900 °C(5~100 h). And the coarsening and spheroidization of NiAl eutectic layers are observed.After high temperature heat treatment at different temperatures(900, 1000, 1100 °C) for 5 h, the area fraction of primary phase of the alloy does not change much. The coarsening and spheroidization of NiAl eutectic lamellar are observed in all samples(withdrawal rates,V=6~150 μm/s). With the increase of heat treatment temperature, the phenomena of coarsening and spheroidization become more obvious.

关 键 词：NIAL金属间化合物 定向凝固 热稳定性 高温热处理 

分 类 号：TG146.15[一般工业技术—材料科学与工程]