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首页> 美国卫生研究院文献>Materials >Core-Shell-Structured Particle Reinforced A356 Matrix Composite Prepared by Powder-Thixoforming: Effect of Reheating Temperature
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Core-Shell-Structured Particle Reinforced A356 Matrix Composite Prepared by Powder-Thixoforming: Effect of Reheating Temperature

机译：粉末触变法制备核壳结构的颗粒增强A356基复合材料：加热温度的影响

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摘要

A novel core-shell-structured Ti-(Al-Si-Ti) particle (Ti-(Al-Si-Ti)p) reinforced A356 matrix composite was fabricated by a new method, powder thixoforming, which combines the merits of both powder metallurgy and semisolid thixoforming. The effects of reheating temperature on the microstructure and tensile properties of the resulting composite were investigated. The results indicated that the thickening of the Al-Si-Ti compound shells, with rising the reheating temperature, significantly enhanced the strengthening role, but the fracture and peeling of the shells, at higher than 600 °C, impaired the strengthening effect. The composite formed at 600 °C had a favorable tensile elongation of 8.3% besides high tensile strengths. During tensile testing, the Ti@(Al-Si-Ti)p frequently fractured across the Ti cores and occasionally cracked around the Ti cores, but preferentially fractured between the outer cracked shells and the inner cores for the composites thixoformed at higher than 600 °C. The delayed formation of cracks in the Ti-(Al-Si-Ti)p and the small size of the cracks contributed to ductility improvement. The MSL model, modified according to the Ti@(Al-Si-Ti)p characteristics, was essentially suitable for predicting the yield strength of such composites. The largest contribution to the strength was resulted from solid solution strengthening of Ti element, but the strengthening role from geometrically necessary dislocations was significantly improved as the reheating temperature rose from 590 °C to 600 °C.
机译：通过粉末触变成型的新方法，制造了一种新型的核-壳结构Ti-（Al-Si-Ti）颗粒（Ti-（Al-Si-Ti）p）增强的A356基复合材料，结合了两种粉末的优点冶金和半固态触变成型。研究了再加热温度对所得复合材料的微观结构和拉伸性能的影响。结果表明，随着再加热温度的升高，Al-Si-Ti复合材料壳的增厚明显增强了增强作用，但在高于600°C时壳的断裂和剥离会削弱增强效果。在600℃下形成的复合材料除了高拉伸强度外，还具有8.3％的有利拉伸伸长率。在拉伸试验过程中，Ti @（Al-Si-Ti）p经常在整个Ti芯上断裂，偶尔在Ti芯周围开裂，但对于在600°以上触变形成的复合材料而言，其优先在外部裂纹壳和内部芯之间断裂。 C。 Ti-（Al-Si-Ti）p中裂纹的延迟形成和较小的裂纹有助于延展性。根据Ti @（Al-Si-Ti）p特性进行修改的MSL模型基本上适合于预测此类复合材料的屈服强度。 Ti元素的固溶强化是对强度的最大贡献，但是随着再加热温度从590°C升至600°C，几何上必要的位错的强化作用得到了显着改善。

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