微觀相場(chǎng)模擬彈性畸變能對(duì)Ni75Al15Ti10合金沉淀過(guò)程的影響

微觀相場(chǎng)模擬彈性畸變能對(duì)Ni75Al15Ti10合金沉淀過(guò)程的影響Effect of elastic strain energy on Ni75Al15Ti10 alloy precipitation process by microscopic phase-field simulation

基于三元微觀相場(chǎng)動(dòng)力學(xué)模型，研究彈性畸變能對(duì)于Ni75Al15Ti10合金早期沉淀過(guò)程的影響。結(jié)果表明：合金沉淀過(guò)程經(jīng)歷了從L10相向L12相的轉(zhuǎn)變，且通過(guò)定量分析確定最終沉淀產(chǎn)物為復(fù)雜的Ni3(AlTi)相；加入彈性畸變能可以縮短合金從無(wú)序到有序轉(zhuǎn)變的時(shí)間，同時(shí)促使其沿著特定的彈性“軟”方向生長(zhǎng)，最終形成高度擇優(yōu)取向的共格顯微組織。此外，沉淀相內(nèi)部主要存在NiAl以及AlNi這兩種反位缺陷結(jié)構(gòu)，畸變能的引入可以降低反位缺陷濃度，同時(shí)提高正位原子占位幾率。

Based on the ternary microscopic phase-field dynamic model, the effect of elastic strain energy on Ni75Al15Ti10 alloy precipitation process was studied. The results indicate that the precipitation process experiences from the L10 to L12 phase transformation process and the final precipitated phase is Ni3(AlTi) by quantitative analysis. Meanwhile, the elastic strain energy can accelerate the process of transformation from disorder to order, promotes the growth alone the specific elastic “soft” direction, and finally forms coherent microstructure of highly ordered orientation. Furthermore, the main existence of NiAl and AlNi in the precipitation phase is the structure of the two kinds of anti-site defects, and the elastic strain energy can inhibit the generation of anti-site defects, and promote the positive position of atoms to occupy the corresponding lattice point.

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