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SPS制備TiAl基合金微觀組織演變研究
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1.西安理工大學(xué) 材料科學(xué)與工程學(xué)院;2.西北有色金屬研究院

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國家自然科學(xué)基金資助(項(xiàng)目號：51504191,51671152)；陜西省自然科學(xué)研究計劃資助(項(xiàng)目號：2014JM6229),陜西省教育廳自然科學(xué)專項(xiàng)資助(項(xiàng)目號：14JK1512)；西安市科技局科研項(xiàng)目資助(項(xiàng)目號：CXY1438(5))；中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金項(xiàng)目(310832161002)；粉末冶金國家重點(diǎn)實(shí)驗(yàn)室項(xiàng)目資助


Indentification of microstructural evolution mechanisms of TiAl based alloy prepared by spark plasma sintering
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Fund Project:

NationalNaturalScienceFoundation of China (No. 51504191, 51671152); NaturalScienceFoundation of Shaanxi Province of China (No. 2014JM6229); NaturalScienceFoundation of Shaanxi Province Department of Education of China ( No.14JK1512); Foundation of Xi"an Technology Bureau Research Projects ( CXY1438（5）); Fundamental Research Funds for the Central Universities of Ministry of Education of China ( No. 31083216100); State key laboratory of powder metallurgy open issue；

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    摘要:

    以等離子旋轉(zhuǎn)電極霧化球形Ti47Al2Cr2Nb0.2W預(yù)合金粉末為原料，采用SPS技術(shù)在不同燒結(jié)溫度下（1100℃、1200℃、1250℃、1300℃）制備TiAl基合金，結(jié)合XRD、SEM及TEM等檢測手段，對預(yù)合金粉末致密化過程中顯微組織演變進(jìn)行了系統(tǒng)研究以及不同燒結(jié)溫度對力學(xué)性能的影響。結(jié)果表明：當(dāng)燒結(jié)溫度超過1200℃時，組織內(nèi)存在少量高溫殘留B2相，且隨著燒結(jié)溫度的升高，β相（B2相）含量有所增加；燒結(jié)溫度在1100℃時合金具有最高的壓縮斷裂強(qiáng)度、拉伸斷裂強(qiáng)度和斷裂應(yīng)變，分別為2367MPa、600MPa和2.25%；α2相、β相和γ相存在如下晶體學(xué)關(guān)系： ∥ ∥ ， ∥ ∥ ；1300℃燒結(jié)樣品中有形變誘導(dǎo)α2→γ相變以及形變孿晶產(chǎn)生。

    Abstract:

    This work aims at identifying, by coupled X-Ray diffraction, scanning and transmission electron microscopy (XRD, SEM and TEM) observations, the microstructural evolution mechanisms occuring when an atomized Ti-47Al-2Cr-2Nb-0.2W powder is densified by spark plasma sintering (SPS). For this purpose, interruptions of the SPS cycle have been performed to follow the evolution of the microstricture step by step. During heating-up, the microstructure undergoes successive transformations. At begaining temperature of 1100℃ the α phase transforms into γ and residual B2. The γ phase formed is supersaturated in W. At temperature above 1200℃, TEM observations show that the repartition of the plastic dedormation is correlated to the dendritic microstructure, and the deformation induced α2 →γ phase transformation and the twins.

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引用本文

楊鑫,康新婷. SPS制備TiAl基合金微觀組織演變研究[J].稀有金屬材料與工程,2019,48(9):2994~3000.[Yang Xin, kang xinting. Indentification of microstructural evolution mechanisms of TiAl based alloy prepared by spark plasma sintering[J]. Rare Metal Materials and Engineering,2019,48(9):2994~3000.]
DOI：10.12442/j. issn.1002-185X.20170240

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  • 收稿日期:2017-03-28
  • 最后修改日期:2019-04-01
  • 錄用日期:2019-07-02
  • 在線發(fā)布日期: 2019-10-09
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