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晶界遷移研究進展及其在TiAl合金中的原位分析
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凝固技術(shù)國家重點實驗室

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國家自然科學(xué)基金面上項目(51774238和51971176),2018年裝備預(yù)先研究教育部聯(lián)合基金(6141A020332).


Research Progress of Grain Boundary Migration and its in-situ Study on TiAl alloys
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    摘要:

    金屬材料中晶粒形態(tài)的演變是晶界遷移的結(jié)果,而晶粒形態(tài)又是決定材料性能的一個重要因素,因此,通過調(diào)控晶界遷移以獲得目標(biāo)組織成為工程研究關(guān)注的問題。本文綜述了金屬晶界遷移問題的研究,并給出了作者關(guān)于TiAl合金相關(guān)的進展：首先介紹了晶界遷移的現(xiàn)象及物理模型,然后分析了晶界遷移的驅(qū)動力,并著重說明擴散和應(yīng)力驅(qū)動下的晶界遷移現(xiàn)象。進一步,討論了晶界遷移中的各種影響因素,包括取向差、晶界結(jié)點、曲率、溫度和溫度梯度等。最后,對晶界遷移調(diào)控在工程上的一些應(yīng)用進行了介紹,特別討論了其在TiAl合金中的應(yīng)用,并結(jié)合作者的原位觀察工作,對兩種TiAl合金在高溫單相區(qū)的晶界遷移現(xiàn)象進行了分析。

    Abstract:

    The evolution of grain morphology is accompanied with grain boundary (GB) migration, and the grain morphology significantly determines the properties. Therefore, the key problem in engineering research is to obtain expected microstructures by controlling GB migration. The understanding on GB migration in metals was reviewed and the current study on TiAl alloys was given in this paper. First, the phenomenon and physical model of GB migration were introduced. Then the driving force, especially the diffusion and stress, was analyzed. Further, the influence factors of GB migration were discussed, including misorientation, grain boundary triple junctions, curvature and temperature. Finally, some applications of the regulation of GB migration were introduced. Combined with in-situ observation, for the first time, the GB migrations of TiAl alloys in single-phase regions at high temperatures were analyzed.

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楊劼人,張立騰,高子彤,胡銳.晶界遷移研究進展及其在TiAl合金中的原位分析[J].稀有金屬材料與工程,2021,50(2):699~708.[yangjieren, zhangliteng, gaozitong, hurui. Research Progress of Grain Boundary Migration and its in-situ Study on TiAl alloys[J]. Rare Metal Materials and Engineering,2021,50(2):699~708.]
DOI：10.12442/j. issn.1002-185X.20200140

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  • 收稿日期:2020-03-01
  • 最后修改日期:2020-03-13
  • 錄用日期:2020-03-19
  • 在線發(fā)布日期: 2021-03-09
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