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材料工程  2015, Vol. 43 Issue (10): 20-27    DOI: 10.11868/j.issn.1001-4381.2015.10.004
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
放电等离子烧结制备Nb-Si-Ti-Al-Hf-Cr合金的显微组织及力学性能
赵东阳, 刘伟, 沙江波
北京航空航天大学 材料科学与工程学院, 北京 100191
Microstructure and Properties of Nb-Si-Ti-Al-Hf-Cr Alloys Fabricated by Spark Plasma Sintering
ZHAO Dong-yang, LIU Wei, SHA Jiang-bo
School of Material Science and Engineering, Beihang University, Beijing 100191, China
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摘要 以预合金化的粉末尺寸D50为3.3μm的NbSS固溶体相细粉末,粉末尺寸D50分别为22.1μm和23.5μm的Nb5Si3和Cr2Nb化合物粉末为原料,采用放电等离子烧结技术制备NbSS/Nb5Si3两相合金和NbSS/Nb5Si3/Cr2Nb三相合金,研究显微组织形貌、室温和高温力学性能及高温氧化性能。结果表明:两相合金的显微组织由NbSS基体和呈均匀岛状分布的Nb5Si3组成,三相合金中NbSS有相互连接成基体的趋势,而Nb5Si3和Cr2Nb相也以块状散布在NbSS中。NbSS/Nb5Si3两相合金和NbSS/Nb5Si3/Cr2Nb三相合金的室温断裂韧性值KQ分别达到15.1MPa·m1/2和11.3MPa·m1/2,室温下合金中NbSS相以韧窝型断裂为主,对Nb-Si基合金的室温断裂韧性有利,而Nb5Si3和Cr2Nb相为脆性断裂。1250℃时NbSS/Nb5Si3/Cr2Nb合金的压缩强度高于NbSS/Nb5Si3合金,但当温度上升到1350℃时两者强度出现反转。Cr2Nb相对合金高温抗氧化性能有利,1250℃下静态氧化100h时NbSS/Nb5Si3合金的氧化增重为233mg/cm2,大于NbSS/Nb5Si3/Cr2Nb合金的175mg/cm2
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赵东阳
刘伟
沙江波
关键词 Nb-Si基合金放电等离子烧结显微组织力学性能氧化行为    
Abstract:Pre-alloyed NbSS solid-solution fine powder with a D50 size of 3.3μm, pre-alloyed Nb5Si3 and Cr2Nb compound powders with D50 size respectively of 22.1μm and 23.5μm were used as raw materials, and two-phase NbSS/Nb5Si3 alloy and three-phase NbSS/Nb5Si3/Cr2Nb alloy were fabricated by Spark Plasma Sintering (SPS). The microstructure, mechanical properties and oxidation behavior at room and/or high temperatures were investigated. The results show that the microstructure of the NbSS/Nb5Si3 alloy consists of the NbSS matrix and the uniformly distributed Nb5Si3 islands. As for the NbSS/Nb5Si3/Cr2Nb alloy, the NbSS phase tends to connect to be the matrix, while the Nb5Si3 and Cr2Nb blocks scatter in the NbSS phase. Fracture toughness KQ at room temperature of the two-phase and three-phase alloys are 15.0MPa·m1/2and 11.3 MPa·m1/2, respectively. The NbSS phase is found to fail in a dimple mode under bending, which is greatly beneficial to KQ of the bulk Nb-Si based alloys; while the Nb5Si3 and Cr2Nb phases fracture in a brittle mode. At 1250℃, the compressive strength of the NbSS/Nb5Si3/Cr2Nb alloy is higher than that of the NbSS/Nb5Si3 alloy, whereas it is contrary at 1350℃. The Cr2Nb phase plays a positive role in oxidation resistance at high temperature. Air exposed at 1250℃ for 100h, the oxidation mass gain of NbSS/Nb5Si3 alloy is 233mg/cm2, greater than 175mg/cm2 of the NbSS/Nb5Si3/Cr2Nb alloy.
Key wordsNb-Si based alloy    spark plasma sintering    microstructure    mechanical property    oxidation behavior
收稿日期: 2014-11-15      出版日期: 2015-10-17
1:  TG13  
通讯作者: 沙江波(1965-),男,教授,从事高温结构材料研究工作,联系地址:北京市海淀区学院路37号,北京航空航天大学材料科学与工程学院(100191),jbsha@buaa.edu.cn     E-mail: jbsha@buaa.edu.cn
引用本文:   
赵东阳, 刘伟, 沙江波. 放电等离子烧结制备Nb-Si-Ti-Al-Hf-Cr合金的显微组织及力学性能[J]. 材料工程, 2015, 43(10): 20-27.
ZHAO Dong-yang, LIU Wei, SHA Jiang-bo. Microstructure and Properties of Nb-Si-Ti-Al-Hf-Cr Alloys Fabricated by Spark Plasma Sintering. Journal of Materials Engineering, 2015, 43(10): 20-27.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.10.004      或      http://jme.biam.ac.cn/CN/Y2015/V43/I10/20
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