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復(fù)相Al3Ti—8Mn基合金的顯微組織
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TG146.2

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國(guó)家自然科學(xué)基金!59771005，中國(guó)博士后基金，上海市博士后基金


Microstructures of Multiphase Al_3Ti-8Mn-Based Alloys
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    摘要:

    在Ａｌ－Ｔｉ－Ｎｂ－８Ｍｎ四元系鄰近Ｌ１２型Ａｌ３Ｔｉ－８Ｍｎ成份區(qū)合金中，隨Ｎｂ含量變化，其顯微組織發(fā)生明顯變化。通過(guò)對(duì)不同合金的微觀組織的考察，進(jìn)一步確認(rèn)了在Ａｌ６７Ｍｎ８Ｔｉ２５基金中加Ｎｂ并相應(yīng)調(diào)整Ａｌ和Ｔｉ含量可形成ＤＯ２２型Ａｌ３（Ｔｉ，Ｎｂ），Ｌ１０型ＴｉＡｌ和Ｇａ２Ｈｆ型Ａｌ２Ｔｉ３種類型的第二相。本文列舉了Ａｌ６７Ｍｎ８ｔＩ２３Ｎｂ２，Ａｌ６５Ｍｎ８Ｔｉ２６－５Ｎｂ０．５，Ａｌ５

    Abstract:

    The microstructures of the alloys near the Al3Ti-8Mn composition region of the Al-Ti-Nb-8Mn quaternary system changewith variation of the Nb content. The microstructures have been investigated using optical microscopy, scanning electron microscopy(SEM) and transmission electron microscopy(TEM). It is determined that in Al67Mn8Ti22-based alloys modified with Nb the secondphases can be DO22 Al3 (Ti,Nb), L10 TiAl or Ga2Hf type of Al2Ti. The microstructures of four typical experimental alloys, A67,Mn8Ti23Nb2, Al59Mn8Ti30Nb3, Al65Mn8Ti26.5Nb0.5 and Al65Mn8Ti23Nb4,are presented in this paper. The second phase Al3 (Ti, Nb)particles con be dispersed blocky or dendritic,the L10 TiAl particles are ripple-like or needle-like, and Ll10 TiAl arrays alternately withL12 matrix. The netty Al2Ti phase is plate-like under TEM and distributes across the L13 matrix.

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石榮 張津徐.復(fù)相Al3Ti—8Mn基合金的顯微組織[J].稀有金屬材料與工程,1999,(5):277~280.[Shi Rong, Zhang Jinxu, Weng Xiaojun, Su Jian, Hu Gengxiang. Microstructures of Multiphase Al_3Ti-8Mn-Based Alloys[J]. Rare Metal Materials and Engineering,1999,(5):277~280.]
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