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合金元素對(duì)Laves相增強(qiáng)Nb基合金的相組成
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國(guó)家自然科學(xué)基金 (50474009); 江西省自然科學(xué)基金 (0350045); 江西省教育廳青年科學(xué)基金 (GJJ10179); 南昌航空大學(xué)博士科研啟動(dòng)基金 (EA200906169)


Effects of Alloying Element Additions on the Phase Transformation and Mechanical Properties of Laves Phase Reinforced Nb Matrix Composites
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    摘要:

    采用機(jī)械合金化與熱壓燒結(jié)工藝制備了添加合金元素V和Fe的Laves相增強(qiáng)的Nb基復(fù)合材料。研究了添加質(zhì)量分?jǐn)?shù)4% V和Fe的Nb/NbCr2-4.0V和Nb/NbCr2-4.0Fe配比成分的元素粉，經(jīng)MA 20 h后在1250 ℃熱壓30 min所獲得的Nb/NbCr2合金的組織和性能。結(jié)果表明：在熱壓過程中原位合成出細(xì)小彌散分布的三元Laves相Nb(Cr, V)2和Nb(Cr, Fe)2，并且V和Fe原子只占據(jù)Laves相中的Cr原子位置。制備出的Laves相增強(qiáng)Nb基合金接近全致密，組織細(xì)小均勻，晶粒尺寸小于500 nm。Nb/NbCr2-4.0V和Nb/NbCr2-4.0Fe合金的斷裂韌性分別達(dá)到5.3和6.3 MPa·m1/2，其中 Nb/NbCr2-4.0Fe合金不僅抗壓強(qiáng)度達(dá)到2256 MPa，其屈服強(qiáng)度和塑性應(yīng)變也分別達(dá)到2094MPa和6.03%

    Abstract:

    The Laves phase reinforced Nb matrix composite materials with V and Fe additions were prepared by mechanical alloying and reactive hot pressing. Microstructures and properties were investigated of Nb/NbCr2 alloys prepared from 20 h mechanically alloyed powders of Nb/NbCr2-4.0V and Nb/NbCr2-4.0Fe stoichiometric compositions by hot pressing at 1250 °C for 30 min. The results indicate that the fine dispersed ternary Laves phase Nb(Cr,V)2 and Nb(Cr, Fe)2 are synthesized in the Nb matrix by the in-situ reaction synthesis technique during hot pressing. In the ternary Laves phase V and Fe atoms preferentially occupy the Cr sites. The prepared Laves phase reinforced Nb matrix alloys with fine and uniform microstructures are nearly full-dense, and their grain sizes are less than 500 nm. The Nb/NbCr2-4.0V and Nb/NbCr2-4.0Fe alloys have fracture toughnesses of 5.3 and 6.3 MPa·m1/2 respectively. Furthermore, the Nb/NbCr2-4.0Fe alloy has a yield strength of 2094 MPa, compressive strength of 2256 MPa and plastic strain of 6.03%

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肖 璇,魯世強(qiáng),董顯娟,黃銘剛,劉俊偉.合金元素對(duì)Laves相增強(qiáng)Nb基合金的相組成[J].稀有金屬材料與工程,2013,42(3):560~564.[Xiao Xuan, Lu Shiqiang, Dong Xianjuan, Huang Minggang, Liu Junwei. Effects of Alloying Element Additions on the Phase Transformation and Mechanical Properties of Laves Phase Reinforced Nb Matrix Composites[J]. Rare Metal Materials and Engineering,2013,42(3):560~564.]
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  • 收稿日期:2012-03-01
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