Mechanical Properties and Microstructure of Nb/Nb5Si3/Cr2Nb Alloys Prepared by Spark Plasma Sintering
Through the spark plasma sintering technology (SPS),the Nb/Nb5Si3/Cr2Nb mixed powders with different volume ratios of 7:1:2 and 7:2:1 were sintered into ingots.The effects of three powder mixing methods on phase constitution,microstructure and room-temperature mechanical properties of the ternary Nb/Nb5Si3/Cr2Nb alloys were investigated.The result shows that the method of dry mixing without ball milling is advantageous for toughness,the increase of SPS temperature decreases the toughness whereas improves the hardness.The stiffening Nb5Si3 and Cr2Nb phases tend to form a continuous network,resulting in decrease of toughness.It is interesting that when the fractions of the Nb5Si3 phase larger than that of the Cr2Nb phases,these strengthening phases prefer to appear in the form of network,which is detrimental for toughness.
Nb/Nb5Si3/Cr2Nb alloys:Spark plasma sintering
Wei Zong Wei Liu Jiangbo Sha
School of Materials Science and Engineering, Beihang University, Beijing, China
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
747-753
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）