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微量TiC對(duì)Mo-Ti-Zr-TiC合金性能與顯微組織的影響
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國(guó)家杰出青年科學(xué)基金資助 (50925416)


Effect of Trace TiC on Property and Microstructure of Mo-Ti-Zr-TiC Alloy
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    摘要:

    采用粉末冶金方法制備Mo-Ti-Zr-TiC合金，研究微量TiC的添加對(duì)Mo-Ti-Zr-TiC合金的拉伸性能和顯微組織的影響。結(jié)果表明，在Mo-Ti-Zr合金中添加微量TiC (0.1%~0.5%，質(zhì)量分?jǐn)?shù)) 后，合金的相對(duì)密度和室溫抗拉強(qiáng)度得到了提高，當(dāng)TiC添加量為0.4%時(shí)，合金強(qiáng)度最高，較Mo-Ti-Zr合金提高了28.1%。微量TiC的添加，阻礙了合金燒結(jié)過(guò)程中的晶粒長(zhǎng)大，合金晶粒尺寸隨TiC添加量的增加而降低。添加的細(xì)小TiC 粒子在高溫?zé)Y(jié)過(guò)程中或與坯體中的微量氧發(fā)生反應(yīng)形成了由Mo、Ti、C及O 4種元素組成的 (Mo, Ti)xOyCz細(xì)小復(fù)合第二相粒子，或發(fā)生團(tuán)聚結(jié)成大顆粒，對(duì)合金起到凈化晶界氧和彌散強(qiáng)化的作用，因而合金的性能相比Mo-Ti-Zr合金有了較明顯的提高。

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    Mo-Ti-Zr-TiC alloy was prepared via powder metallurgy method. The effects of trace TiC additive on the mechanical properties and microstructure of TiC reinforced Mo-Ti-Zr-TiC alloy were studied. The results indicate that the relative density and the tensile strength at room temperature of Mo-Ti-Zr-TiC alloy is effectively enhanced by adding trace TiC (0.1wt%~0.5wt%). The tensile strength achieves the highest value when the content of TiC is 0.4wt%, which is 28.1% higher than that of Mo-Ti-Zr alloy. The adding of trace TiC can inhibit the grain growth during alloy sintering process, which leads to the decrease of grain sizes with the rise of TiC content. A part of the fine TiC particles react with trace oxygen in molybdenum matrix to form (Mo,Ti)xOyCz compound second phase particles during high temperature sintering, while the other part are agglomerated into large particles, which play a role in grain boundaries purification and dispersion-strengthening.

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錢(qián) 昭,范景蓮,成會(huì)朝,田家敏.微量TiC對(duì)Mo-Ti-Zr-TiC合金性能與顯微組織的影響[J].稀有金屬材料與工程,2012,41(6):1107~1110.[Qian Zhao, Fan Jinglian, Cheng Huichao, Tian Jiamin. Effect of Trace TiC on Property and Microstructure of Mo-Ti-Zr-TiC Alloy[J]. Rare Metal Materials and Engineering,2012,41(6):1107~1110.]
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  • 收稿日期:2011-06-18
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