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首页> 外文期刊>Materials Science and Engineering >Eutectic Al-Si piston alloy surface transformed to modified hypereutectic alloy via FSP
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Eutectic Al-Si piston alloy surface transformed to modified hypereutectic alloy via FSP

机译：通过FSP将共晶Al-Si活塞合金表面转变为改性过共晶合金

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摘要

In the present study, friction stir processing was used to transform the surface of eutectic LM13 Al-Si alloy into a modified hypereutectic alloy by addition of 10% volume fraction Si particles. Particle distribution, microstructure, hardness and tensile properties of the stirred zone were studied as functions of tool geometry, FSP pass number, and rotational and traverse speeds. Friction stir processing increases the tensile strength, elongation and hardness of the as-cast metal via elimination of porosities and dendritic branches, and also breakup of needle-like eutectic silicon. Threaded pin results in a better particle distribution while the square pin leads to lower Si particle size. Increase in pass number causes better particle distribution, lower Si particle size, higher strength and elongation, and lower hardness. Increasing the rotational speed improves particle distribution, reduces Si particle size, and increases strength, elongation and hardness. Increment in traverse speed results in worse particle distribution, larger Si particles size and lower elongation but higher hardness which having an insignificant effect on the tensile strength.
机译：在本研究中，通过添加10％体积分数的Si颗粒，采用摩擦搅拌工艺将共晶LM13 Al-Si合金的表面转变为改性的过共晶合金。研究了搅拌区的颗粒分布，微观结构，硬度和拉伸性能，这些参数是刀具几何形状，FSP通过次数以及旋转速度和移动速度的函数。摩擦搅拌工艺通过消除孔隙和树枝状分支以及针状共晶硅的破裂，提高了铸态金属的拉伸强度，伸长率和硬度。螺纹销导致更好的颗粒分布，而方形销导致更低的Si粒度。通过次数的增加导致更好的颗粒分布，更低的Si粒度，更高的强度和伸长率以及更低的硬度。增加旋转速度改善了颗粒分布，减小了Si颗粒尺寸，并增加了强度，伸长率和硬度。往复速度的增加导致更差的颗粒分布，更大的Si颗粒尺寸和更低的伸长率，但是更高的硬度，这对拉伸强度的影响不显着。

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