75Al15Ti10合金的沉淀過程。首先通過原子演化圖發(fā)現(xiàn),沉淀過程分為兩步,起初為L10相向L12相的轉(zhuǎn)變,隨后為化學計量比L12相的形成。隨后研究了單級時效溫度對微結(jié)構(gòu),原子占位以及原子擴散的影響,結(jié)果表明：隨著溫度升高無規(guī)則形狀的γ′相變?yōu)橐?guī)則立方體狀并且擇優(yōu)取向顯著；同時Al原子從γ′相界面向內(nèi)部擴散,Ti原子正好相反。但是溫度越高,原子占位以及有序化程度越低。為了提高γ′相的原子占位,我們進一步比較了雙級時效對γ′相的影響。發(fā)現(xiàn)雙級時效不僅能獲得規(guī)則排列穩(wěn)定的γ′相,同時還可以提高Al與Ti原子在其正位處的原子占位并抑制反位缺陷的產(chǎn)生。我們的實驗結(jié)果在一定程度上為制備具有優(yōu)異力學性能的Ni-Al-Ti合金提供了理論依據(jù)。"/>

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時效工藝對Ni75Al15Ti10合金沉淀過程的微觀相場模擬
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材料科學與工程學院,材料科學與工程學院,材料科學與工程學院,材料科學與工程學院,材料科學與工程學院

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Microscopic phase-field Simulation for the influence of aging process on the precipitation process of Ni75Al15Ti10 alloy
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School of Materials Science and Engineering,North University of China,School of Materials Science and Engineering,North University of China,School of Materials Science and Engineering,North University of China,School of Materials Science and Engineering,North University of China,School of Materials Science and Engineering,North University of China

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    本文通過微觀相場動力學模型模擬了Ni75Al15Ti10合金的沉淀過程。首先通過原子演化圖發(fā)現(xiàn),沉淀過程分為兩步,起初為L10相向L12相的轉(zhuǎn)變,隨后為化學計量比L12相的形成。隨后研究了單級時效溫度對微結(jié)構(gòu),原子占位以及原子擴散的影響,結(jié)果表明：隨著溫度升高無規(guī)則形狀的γ′相變?yōu)橐?guī)則立方體狀并且擇優(yōu)取向顯著；同時Al原子從γ′相界面向內(nèi)部擴散,Ti原子正好相反。但是溫度越高,原子占位以及有序化程度越低。為了提高γ′相的原子占位,我們進一步比較了雙級時效對γ′相的影響。發(fā)現(xiàn)雙級時效不僅能獲得規(guī)則排列穩(wěn)定的γ′相,同時還可以提高Al與Ti原子在其正位處的原子占位并抑制反位缺陷的產(chǎn)生。我們的實驗結(jié)果在一定程度上為制備具有優(yōu)異力學性能的Ni-Al-Ti合金提供了理論依據(jù)。

    Abstract:

    The precipitation process of Ni75Al15Ti10 alloy was simulated by microscopic phase-field kinetics model. The microscopic morphology evolution is firstly studied, which indicates that the precipitation process has been divided into two stages: the first is the transformation from L10 phase to L12 phase, the second is the formation of stoichiometric L12 phase. The effect of single aging temperature on the microstructure and atomic occupation probability and atomic diffusion are subsequently investigated. The result shows that the shape of γ′ precipitates is transformed from irregular shape to regular cuboid and the degree of orientation growth enhances with the increasing of aging temperature. But the higher aging temperature, the lower occupation probability and lower order degree. Meanwhile, the path of diffusion of Al is from the interface to the internal of γ" phase, and the diffusion of Ti atom is the opposite. Furthermore, we further study the dual aging with the purpose of improving occupation probability of γ′ precipitates and discuss its influence on the γ′ phase. Dual aging can not only obtain stable γ" phase with regular shape, but also can increase the occupation probability of Al and Ti and inhibit the formation of anti-site defects. Our results provide useful information in preparing Ni-Al-Ti alloy with excellent mechanical properties to some extent.

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孫遠洋,趙宇宏,侯華,鄭曉娟,郭慧俊.時效工藝對Ni75Al15Ti10合金沉淀過程的微觀相場模擬[J].稀有金屬材料與工程,2018,47(10):3000~3007.[Sun Yuanyang, Zhao Yuhong, Hou Hua, Zheng Xiaojuan, Guo Huijun. Microscopic phase-field Simulation for the influence of aging process on the precipitation process of Ni75Al15Ti10 alloy[J]. Rare Metal Materials and Engineering,2018,47(10):3000~3007.]
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  • 收稿日期:2017-03-10
  • 最后修改日期:2018-07-31
  • 錄用日期:2017-08-16
  • 在線發(fā)布日期: 2018-11-08
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