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放电等离子烧结制备Ti-4.3Fe-7.1Cr-3Al合金
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国家自然科学基金(50571017)


Ti-4.3Fe-7.1Cr-3Al Alloy Prepared by Spark Plasma Sintering
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    摘要:

    利用放电等离子烧结技术制备了一种低成本车用钛合金(Ti-4.3Fe-7.1Cr-3Al),研究烧结温度对其晶粒尺寸、孔隙率、显微组织、成分均匀性、相结构及力学性能的影响。结果表明,在1100和1300 ℃两种烧结温度下,其显微组织基本由针状α相和β基体相组成,其间分布着条状或颗粒状TiC。随着烧结温度的升高,晶粒尺寸逐渐增大,孔隙率逐渐减小,TiC析出密度逐渐增多,针状α相逐渐减少,并且由1100 ℃的不均匀分布逐渐转变为1300 ℃的均匀分布。电子探针分析表明,1100 ℃时成分均匀性差,出现了Cr和Al元素的偏析,而1300 ℃时基本无偏析。XRD分析和纳米力学探针测量显示,添加的合金元素使β相的晶格参数减小以及细小第二相析出,弹性模量增大。

    Abstract:

    A low-cost vehicle titanium alloy (Ti-4.3Fe-7.1Cr-3Al) was prepared by spark plasma sintering process. Effects of the sintering temperature on the grain size, porosity, microstructure, composition uniformity, phase structure and mechanical properties were investigated. The results show that the microstructure of both samples sintered at 1100 or 1300 oC contain acicular α phase and β basic phase, with short strips and granular TiC distributing among them. Grain size and TiC precipitation density increase but the porosity and α phase decrease with the sintering temperature increasing, and the α phase distribution turns more and more even. Electron probe microanalysis shows that, the components have poor homogeneousness, segregation of Cr and Al occurs at 1100 oC, but disappears at 1300 oC. XRD analysis and nano-mechanical microprobe measurement show that additive elements cause the decrease of β phase lattice parameters and the precipitation of fine second phase, so the elastic modulus increases.

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焦泽辉,宋西平.放电等离子烧结制备Ti-4.3Fe-7.1Cr-3Al合金[J].稀有金属材料与工程,2012,41(2):330~334.[Jiao Zehui, Song Xiping. Ti-4.3Fe-7.1Cr-3Al Alloy Prepared by Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2012,41(2):330~334.]
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  • 收稿日期:2011-02-16
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