铌锆合金高温力学性能及变形机制研究  

Study on High Temperature Mechanical Properties and Deformation Mode of Nb-1Zr Alloy

作　　者：吴孟海 吴朝圣 谭敦强[1] 冯美兵 郭雪琪 张洪亮 WU Meng-hai;WU Chao-sheng;TAN Dun-qiang;FEN Mei-bing;GUO Xue-qi;ZHANG Hong-liang(International Institute of Materials Innovation,Nanchang University,Nanchang 330031,China;ATTL Advanced Materials Co.,Ltd.,Tianjin 301800,China;Jiujiang Tanbre Co.,Ltd.,Jiujiang 332013,China;Xianyang Meikeer Machinery Co.,Ltd.,Xianyang 712000,China)

机构地区：[1]南昌大学国际材料创新研究院,江西南昌330031 [2]安泰天龙钨钼科技有限公司,天津301800 [3]九江有色金属冶炼有限公司,江西九江332013 [4]咸阳美科尔机械有限公司,陕西咸阳712000

出　　处：《稀有金属与硬质合金》2021年第3期46-51,共6页Rare Metals and Cemented Carbides

摘　　要：测试了铌锆合金在1 000~1 800℃下的抗拉强度、屈服强度、延伸率和断面收缩率,并对单向拉伸后的断口形貌进行了观察。结果表明:随着温度升高,铌锆合金在高温下的抗拉强度和屈服强度的下降速度由快转慢,且二者逐渐接近;延伸率在1 000~1 200℃温度区间的变化不大,但在1 200℃以上随温度增加而快速增大;断面收缩率在试验温度范围内变化不大;铌锆合金在1 000~1 200℃温度区间内的主要变形机制为位错滑移,在1 400~1 800℃温度区间内的主要变形机制为晶界滑动;铌锆合金组织中有两种第二相粒子,其中氧化锆颗粒主要起弥散强化作用,而碳化锆颗粒主要起沉淀强化作用。Tensile strength, yield strength, elongation and reduction of area of the Nb-1 Zr alloy at 1 000~1 800 ℃ were tested, and the fracture morphology after unidirectional tensile test was observed.The results show that with the increase of temperature, the tensile strength and yield strength of Nb-1 Zr alloy at high temperature decrease from fast to slowly, and the two gradually approach.The elongation is almost unchanged at 1 000~1 200 ℃,but it increases rapidly with the increase of temperature above 1 200 ℃.The reduction of area does not change much within the test temperature range.The major deformation modes of Nb-1 Zr alloy are dislocation slipping at 1 000~1 200 ℃ and grain-boundary sliding at 1 400~1 800 ℃.There are two kinds of second-phase particles in Nb-1 Zr alloy: Zirconia particles mainly play the role of dispersion strengthening, while zirconium carbide particles mainly play the role of precipitation strengthening.

关 键 词：铌锆合金 高温 力学性能 断口形貌 位错滑移 晶界滑动 第二相粒子 

分 类 号：TG146.41[一般工业技术—材料科学与工程]