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首页> 外文期刊>Materials Science and Engineering >Strength-ductility trade-off via SiC nanoparticle dispersion in A356 aluminium matrix
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Strength-ductility trade-off via SiC nanoparticle dispersion in A356 aluminium matrix

机译：通过在A356铝基体中分散SiC纳米颗粒实现强度-延展性的权衡

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摘要

A process was developed to disperse beta-SiC nancparticies (NPs), with a high propensity to agglomerate, within a matrix of A356 aluminum alloy. A suitable dispersion of 1 wt% SiC NPs in the A356 matrix was obtained through a hybrid process including a solid-state modification on the surface of the NPs, a two-step stirring process in the semi-solid and then the liquid-state, and a final hot-rolling process for fragmentation of the brittle eutectic silicon phase and porosity elimination. Titanium and nickel where used as the nanoparticle SiC surface modifiers. Both modifiers were found to improve the mechanical properties of the resulting material, however, the highest improvement was found from the nickel surface modification. For the nickel modification, compared to the non-reinforced rolled alloy, more than a 77%, 85%, and 70% increase in ultimate tensile strength (UTS), yield strength (YS), and strain % at the break, respectively were found with respect to the unreinforced rolled A356. For the rolled nanocomposite containing 1 wt % SiCnp and nickel modification, an average YS, UTS, and strain % at the break of 277 MPa, 380 MPa, and 16.4% were obtained, respectively, which are unique and considerable property improvements for A356 alloy.
机译：开发了一种将具有高附聚倾向的β-SiC纳米颗粒（NP）分散在A356铝合金基体内的工艺。通过混合工艺（包括在NP的表面上进行固态改性，在半固态中进行两步搅拌然后在液态下进行混合工艺）获得了1356％的SiC NP在A356基体中的合适分散体，最后的热轧工艺用于破碎脆性的共晶硅相并消除孔隙。钛和镍用作纳米颗粒SiC表面改性剂。发现两种改性剂均能改善所得材料的机械性能，但是，从镍表面改性中发现最高的改进。对于镍改性，与未增强的压延合金相比，断裂时的极限抗拉强度（UTS），屈服强度（YS）和应变％分别增加了77％，85％和70％以上发现与未增强的轧制A356有关。对于包含1 wt％SiCnp和镍改性物的压延纳米复合材料，断裂时的平均YS，UTS和应变％分别为277 MPa，380 MPa和16.4％，这对于A356合金而言是独特且显着的性能改进。

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