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D022型Ni3(V,Al)相沉淀過程中應(yīng)力取向效應(yīng)的微觀相場模擬
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國家自然科學基金(51075335,10902086,50875217);西北工業(yè)大學基礎(chǔ)研究基金


Microscopic Phase Field Simulation for 3-D Stress Orienting Effect of D022-Ni3(V,Al) in Precipitation Process
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    摘要:

    應(yīng)用耦合共格彈性畸變的微觀彈性相場法研究D022型Ni3(V,Al) 相沉淀過程中的應(yīng)力取向效應(yīng)。結(jié)果表明,在彈性內(nèi)應(yīng)力作用下,D022沉淀相表現(xiàn)出明顯的位向性:相顆粒傾向于沿應(yīng)力軟方向[100]生長而在[001]方向受抑制,即生長方向與長軸[001]方向垂直,D022相最終沉淀形貌呈“層”狀;沉淀過程中三類D022相變體相互協(xié)調(diào)以減小共格畸變能,最終D022-variant Ⅲ消失,存留的兩類中D022-variant Ⅰ體積比占優(yōu)。

    Abstract:

    D022 phase is the main strengthening phase in Ni-Al-V alloy applied at high temperature and structure transformation from fcc to D022 during the ordering process has been investigated extensively. The 3-D stress orienting effect of D022-Ni3(V,Al) was studied using microelastical phase field model in this work. The results indicate that D022 particles tend to grow along stress soft direction of [100] and be depressed along [001] which means the growing direction is perpendicular to c-axes of D022 phase, and the layer D022 microstructure is formed due to the way they grows. The fcc matrix transforms into three D022 variants during the early stage and then the strain field of D022 and L12 particles generates elastic interaction which leads to variants deletion. Different D022 variants assort and compete with each other during precipitation process, and D022-variant Ⅲ disappears while D022-variantⅠdominates in the end.

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莊厚川,陳 錚,王永欣,伍 林. D022型Ni3(V, Al)相沉淀過程中應(yīng)力取向效應(yīng)的微觀相場模擬[J].稀有金屬材料與工程,2012,41(11):1960~1964.[Zhuang Houchuan, Chen Zheng, Wang Yongxin, Wu Lin. Microscopic Phase Field Simulation for 3-D Stress Orienting Effect of D022-Ni3(V, Al) in Precipitation Process[J]. Rare Metal Materials and Engineering,2012,41(11):1960~1964.]
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  • 收稿日期:2011-11-24
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