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合金元素Al对Laves相NbCr2显微组织及断裂韧性的影响
Effects of Al on the Microstructure and Fracture Toughness of NbCr2 Alloys
【摘要】 采用机械合金化+热压烧结的工艺路线制备Laves相NbCr2合金,研究合金元素Al对其显微组织、力学性能,特别是韧化效果的影响。结果表明:合金元素Al主要占据了Laves相NbCr2金属间化合物中Cr原子的晶格位置。添加合金元素Al的Laves相NbCr2合金较未合金化的NbCr2硬度有所提高;当Al含量达到12at%时,断裂韧性要高于未合金化的NbCr2合金,达到了6.8MPam,远远高于熔铸合金的断裂韧性(1.2MPam)。
【Abstract】 NbCr2 alloys of Laves phase were prepared by mechanical alloying and hot pressing, and the influences of Al on the microstructure and mechanical properties, especially fracture toughness, of NbCr2 alloys were studied. The results show that the alloying element Al mainly exists in the Cr site in the NbCr2 Laves phase. The hardness of NbCr2 alloys increases slightly with the increase of Al adding amount, but no obvious effect on the fracture toughness for the NbCr2 alloys. At a higher Al adding level (i. e. 12 at%), the fracture toughness of the NbCr2 alloy is 6.8 MPa m , a higher value than that of the cast alloys (1.2 MPa m ).
【Key words】 laves phase NbCr2; alloying; fracture toughness; hardness;
- 【文献出处】 稀有金属材料与工程 ,Rare Metal Materials and Engineering , 编辑部邮箱 ,2009年01期
- 【分类号】TG113
- 【被引频次】25
- 【下载频次】299