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首页> 外文期刊>Materials Science and Engineering >Enhanced combination of strength and ductility in ultrafine-grained aluminum composites reinforced with high content intragranular nanoparticles
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Enhanced combination of strength and ductility in ultrafine-grained aluminum composites reinforced with high content intragranular nanoparticles

机译：高含量颗粒内纳米颗粒增强的超细晶粒铝复合材料的强度和延展性的增强组合

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摘要

Simultaneous enhancement of the strength and ductility in metal-matrix nanocomposites with high content nano-reinforcements is crucial for the development of novel composite materials. Here SiC/Al nanocomposites with ultrafine Al grains and intragranular 10 vol% SiC nanoparticle were prepared by mechanical alloying and hot pressure sintering followed by hot extrusion. The results show that nanocrystalline Al grains and uniformly distributed SiC nanoparticles (SiCnp) in the composite powders are obtained after ball-milling. The prior particle boundary (PPB) in the composite powders cannot be fully removed by sintering at 580 degrees C under 20 MPa, but can be eliminated by subsequent hot extrusion at 450 degrees C with a ratio 25:1. The extruded nanocomposites possess ultrafine Al grains with diameter 320 nm and intragranular SiCnp created by the dynamic recrystallizations (DRX). Such optimal microstructure favors a significant improvement of 284% in yield strength (YS) and 259% in ultimate tensile strength (UTS) compared with monolithic Al, and more interestingly, maintains an elongation up to 12% due to the homogeneous nanoparticles in fine Al grains. Theoretical analysis shows that the dominant strengthening factor is Orowan strengthening related to the high content intragranular SiCnp, with second factor grain boundary strengthening due to ultrafine Al grains.
机译：同时增强具有高含量纳米增强的金属基纳米复合材料的强度和延展性对于开发新型复合材料至关重要。通过机械合金化和热压烧结，然后热挤压，制备了具有超细Al晶粒和10vol％晶粒内SiC纳米颗粒的SiC / Al纳米复合材料。结果表明，球磨后获得了复合粉末中的纳米Al晶粒和均匀分布的SiC纳米颗粒（SiCnp）。复合粉末中先有的颗粒边界（PPB）不能通过在20兆帕下于580摄氏度下烧结而完全去除，但可以通过随后在450摄氏度下以25：1的比例进行热挤压来消除。挤出的纳米复合材料具有直径为320 nm的超细Al晶粒和通过动态重结晶（DRX）生成的晶粒内SiCnp。与整体式Al相比，这种最佳的微观结构可显着提高屈服强度（YS）284％和极限抗拉强度（UTS）259％，并且更有趣的是，由于细小Al中的均质纳米粒子，可保持高达12％的伸长率谷物。理论分析表明，主要的强化因子是与高含量晶粒内SiCnp有关的Orowan强化，而第二因子是由于超细Al晶粒引起的晶界强化。

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