Grain boundary phase transitions and phase diagrams

B.B Straumal , P Ziȩba , W Gust
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引用次数: 63

Abstract

Grain boundary (GB) phase transitions can change drastically the properties of polycrystals. The GB wetting phase transition can occur in the two-phase area of the bulk phase diagram where the liquid (L) and solid (S) phases are in equlibrium. The GB wetting tie line appears in the L+S area. Above the temperature of the GB wetting phase transition a GB cannot exist in equlibrium with the liquid bulk phase. The liquid phase has to substitute the GB and to separate both grains. The experimental data on GB wetting phase transitions in the systems Al–Sn, Al–Ga, Al–Sn–Ga, Cu–In, Cu–Bi, Fe–Si–Zn, Mo–Ni, W–Ni, Zn–Sn and Zn–In are analysed. The GB wetting tie line can continue in the one-phase area of the bulk phase diagram as a GB solidus line. This line represents the GB premelting or prewetting phase transitions. The GB properties change drastically when the GB solidus line is crossed by a change in the temperature or concentration. The experimental data on GB segregation, energy, mobility and diffusivity in the systems Cu–Bi, Al–Ga, Al–Pb and Fe–Si–Zn obtained both in polycrystals and bicrystals are analysed.

晶界相变和相图
晶界相变能极大地改变多晶的性能。GB润湿相变可发生在体相图中液相(L)和固相(S)处于平衡的两相区域。在L+S区域出现GB润湿线。在GB润湿相变温度以上,GB不能与液体本体相平衡存在。液相必须取代GB并分离两种颗粒。分析了Al-Sn、Al-Ga、Al-Sn - ga、Cu-In、Cu-Bi、Fe-Si-Zn、Mo-Ni、W-Ni、Zn-Sn和Zn-In体系GB润湿相变的实验数据。GB润湿线可以作为GB固相线在体相图的单相区域继续存在。这条线表示GB预熔或预湿相变。当温度或浓度的变化越过GB固相线时,GB的性质会发生急剧变化。分析了Cu-Bi、Al-Ga、Al-Pb和Fe-Si-Zn体系在多晶和双晶中GB偏析、能量、迁移率和扩散率的实验数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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