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Nb-Ni-Ti系低Ni側(cè)1000℃相平衡研究
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東北大學(xué) 材料各向異性與織構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室,東北大學(xué) 材料各向異性與織構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室,東北大學(xué) 材料各向異性與織構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室,東北大學(xué) 材料各向異性與織構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室,東北大學(xué) 材料各向異性與織構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室

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TG113.14

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國(guó)家自然科學(xué)基金資助(項(xiàng)目號(hào)50971037),遼寧省高校重點(diǎn)實(shí)驗(yàn)室支持計(jì)劃資助(項(xiàng)目號(hào)LS2010062)


Phase equilibria of the low-Ni side in Nb-Ni-Ti System at 1000℃
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Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University,Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University,Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University,Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University,Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University

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    摘要:

    利用SEM,EPMA,XRD和DSC,對(duì)Nb-Ni-Ti系低Ni側(cè)1000℃的液相相關(guān)相平衡進(jìn)行了研究。結(jié)果表明,1000℃時(shí),在Nb-Ni-Ti系低Ni側(cè)存在著一個(gè)可與(Nb,betaTi)連續(xù)固溶體和TiNi化合物相平衡的液相區(qū)；該液相區(qū)源自Ti-Ni二元系,延伸至含Nb量3.7% (原子分?jǐn)?shù),下同)。而二元化合物TiNi在1000℃時(shí)則可以溶解約8.0%Nb。1000℃時(shí),Nb-Ni-Ti系低Ni側(cè)等溫截面相圖中存在兩個(gè)三相區(qū)Liquid+(Nb,betaTi) TiNi和(Nb,betaTi) TiNi XB,XB是成分約為34.0Nb-44.9Ni-21.1Ti%的六方結(jié)構(gòu)化合物；這兩個(gè)三相區(qū)之間則是寬闊的(Nb,betaTi) TiNi兩相區(qū)。在該兩相區(qū)內(nèi),連續(xù)固溶體(Nb,betaTi)中的Ni含量變化不大、約為3%,Ti含量的變化范圍約為6.6~39.9%。而3.7%Nb的溶入未能使二元化合物Ti2Ni相的穩(wěn)定存在溫度提高到1000℃。

    Abstract:

    The phase equilibria related with the liquid phase at 1000℃ in low-Ni side of the Nb-Ni-Ti system have been investigated by SEM, EPMA, XRD and DSC. It has been shown that there exists the liquid phase which could be in equilibrium with the continuous solid solution (Nb,betaTi) and compound TiNi in the low-Ni side of the Nb-Ni-Ti system at 1000℃. The liquid phase field originates from binary Ti-Ni system and extends to the 3.7%Nb (atomic fraction). The solid solubility of Nb in the compound TiNi is about 8.0%. At 1000℃, there are two three-phase fields consisting of Liquid+(Nb,betaTi) TiNi and (Nb,betaTi) TiNi XB in the Nb-Ni-Ti system, XB is the compound with the composition of 34.0Nb-44.9Ni-21.1Ti% and hexagonal structure. The broad two-phase field (Nb,betaTi) TiNi exists between the two three-phase fields. In this two-phase field, the Ni content in the continuous solid solution (Nb,betaTi) is about 3%, but the Ti content varies from 6.6 to 39.9%. The thermo-stability of the compound Ti2Ni has been improved by the solution of Nb atoms, but the Ti2Ni with 3.7%Nb could not exist at 1000℃.

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李志超,李洪曉,任玉平,蔣敏,秦高梧. Nb-Ni-Ti系低Ni側(cè)1000℃相平衡研究[J].稀有金屬材料與工程,2017,46(7):1875~1880.[LI Zhichao, LI Hongxiao, REN Yuping, JIANG Min, QIN Gaowu. Phase equilibria of the low-Ni side in Nb-Ni-Ti System at 1000℃[J]. Rare Metal Materials and Engineering,2017,46(7):1875~1880.]
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  • 收稿日期:2015-03-27
  • 最后修改日期:2015-04-23
  • 錄用日期:2015-06-11
  • 在線發(fā)布日期: 2017-11-14
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