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首页> 外文期刊>Philosophical Magazine Letters >The roles of auxeticity and volume fraction on gamma ' precipitate microstructures in nickel-base alloys
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The roles of auxeticity and volume fraction on gamma ' precipitate microstructures in nickel-base alloys

机译：辅助和体积分数对镍基合金γ'沉淀微结构的作用

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New correlations are found between the elastic constants and late-stage precipitate microstructures in Ni-Al, Ni-Ga, Ni-Ge and Ni-Si alloys. The auxetic behaviour of Poisson's ratio, v, measured parallel to [001] or [1 (1) over bar0] in response to [110] loading, favours the amalgamation of Ni3Al and Ni3Ga precipitates into non-equilibrium shapes along cube directions when delta v = (v(v') - v(v'))/v(v')> 0, the superscripts referring to the gamma' (Ni3X) and. (Ni-X) phases, respectively. When delta v < 0 amalgamation of Ni3Ge and Ni3Si precipitates does not occur and the particles retain cuboidal shapes. When delta v > 0 amalgamation of Ni3Al and Ni3Ge occurs readily, primarily producing laths of both phases. The gamma' volume fraction, f, is also shown to play a role in the late-stage microstructures of Ni-Al alloys, with an increasing tendency to form Ni3Al laths, rather than plates, as f increases. The shapes of elastically soft. precipitates in inverse Ni-Al and Ni-Ge alloys are different; Ni-Al precipitates are lath shaped, but Ni-Ge precipitates are plate shaped. The Ni-Ge plate shape, in a non-auxetic Ni3Ge matrix (Ni3Ge being the sole non-auxetic Ni3X phase of the four studied), is the only example of persistent plates in any of the Ni-base alloys investigated to date. The combination of an elastically soft precipitate (Ni-Ge) in a non-auxetic matrix suggests a connection between auxeticity and shape.
机译：在Ni-Al、Ni-Ga、Ni-Ge和Ni-Si合金中发现了弹性常数与后期沉淀组织之间的新关联。在[110]荷载作用下，平行于[001]或[1（1）除以bar0]测得的泊松比v的自生行为有利于Ni3Al和Ni3Ga沉淀沿立方体方向合并成非平衡形状，当δv=（v（v’）-v（v’）/v（v’）>0时，上标表示伽马’（Ni3X）和。（Ni-X）相。当δv<0时，Ni3Ge和Ni3Si不会发生融合，颗粒保持立方形状。当δv>0时，Ni3Al和Ni3Ge很容易发生融合，主要产生两相板条。γ的体积分数f也在Ni-Al合金的后期微观结构中起作用，随着f的增加，形成Ni3Al板条而非板材的趋势越来越大。形状弹性柔软。逆Ni-Al和Ni-Ge合金中的析出物不同；Ni-Al析出物呈条状，Ni-Ge析出物呈板状。Ni-Ge板形状为非auxetic Ni3Ge基体（Ni3Ge是所研究的四种合金中唯一的非auxetic Ni3X相），是迄今为止研究的任何镍基合金中唯一的持久性板。弹性软沉淀物（Ni-Ge）在非auxetic基质中的组合表明auxeticity和形状之间存在联系。

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