Mechanical Properties and Microstructure of Nb/Nb5Si3/Cr2Nb Alloys Prepared by Spark Plasma Sintering

Mechanical Properties and Microstructure of Nb/Nb5Si3/Cr2Nb Alloys Prepared by Spark Plasma Sintering
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放电等离子烧结Nb/Nb5Si3/Cr2Nb合金的力学性能和显微组织

DOI:
10.4028/www.scientific.net/msf.747-748.747
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发表时间:
2013-02
期刊:
Materials Science Forum
影响因子:
--
通讯作者:
Jiangbo Sha
Jiangbo Sha
中科院分区:
其他
文献类型:
--
作者:
Wei Zong;Wei Liu;Jiangbo Sha

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采用火花等离子烧结技术(SPS),将体积比为7:1:2和7:2:1的Nb/Nb5Si3/Cr2Nb混合粉末烧结成锭状。研究了三种粉末混合方式对Nb/Nb5Si3/Cr2Nb三元合金相组成、显微组织和室温力学性能的影响。结果表明,不进行球磨的干混法有利于提高材料的韧性,SPS温度的升高使材料的韧性降低,硬度提高。强化相Nb5Si3和Cr2Nb倾向于形成连续网络,导致韧性下降。有趣的是,当Nb5Si3相的分数大于Cr2Nb相的分数时,这些强化相更倾向于以网络的形式出现,这对韧性不利。
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.
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