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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Cr on Microstructure, Mechanical Properties, and Wear Behavior of In Situ 20 wt.%Al2O3/Fe-25Al Composites
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Effect of Cr on Microstructure, Mechanical Properties, and Wear Behavior of In Situ 20 wt.%Al2O3/Fe-25Al Composites

机译：Cr对20 wt％原位Al2O3 / Fe-25Al复合材料的组织，力学性能和磨损行为的影响

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摘要

In order to improve the room temperature ductility and high temperature strength of Fe-25Al alloys, in situ 20 wt.%Al2O3/Fe-25Al composites with 0, 1, 2, 3, 4, and 5 at.% Cr element contents (0-6.70 wt.%) were prepared by mechanical alloying inducing self-propagating reaction with subsequent plasma-activated sintering. Microstructures, room temperature hardness, flexural strength, fracture toughness, and compression property and wear behavior at mid-high temperatures of the sintered samples were tested and analyzed. The results showed that all the composites with Cr element addition had good microstructure with fine grain size and high relative density. The flexural strength and fracture toughness increased first and then decreased with increasing content of Cr. Especially, the composites with 3 at.% Cr had the highest flexural strength, highest fracture toughness, and best compressive properties during 298-1073 K, and the main fracture mechanism changed from brittle fracture at room temperature to plastic deformation and pullout of the second phase at 673 K. With Cr content increasing, the friction coefficients decreased and the wear rates increased because of decreasing hardness. The composites with 3 at.% Cr had excellent wear properties with lower friction coefficient and wear rate.
机译：为了提高Fe-25Al合金的室温延展性和高温强度，应原位添加20 wt。％的Al2O3 / Fe-25Al复合材料，其中Cr元素含量为0、1、2、3、4和5 at。％（通过机械合金化诱导自蔓延反应并随后进行等离子体活化的烧结制备0-6.70wt。％。测试并分析了烧结样品的显微组织，室温硬度，抗弯强度，断裂韧性以及中高温下的压缩性能和磨损行为。结果表明，所有添加Cr元素的复合材料均具有良好的显微组织，晶粒细小，相对密度高。弯曲强度和断裂韧性随Cr含量的增加先增加后降低。特别是，Cr含量为3 at。％的复合材料在298-1073 K期间具有最高的弯曲强度，最高的断裂韧性和最佳的压缩性能，其主要断裂机理从室温下的脆性断裂转变为第二次塑性变形和拉拔。在673 K时，钢的相变。随着Cr含量的增加，由于硬度降低，摩擦系数降低，磨损率提高。含3 at。％Cr的复合材料具有优异的耐磨性，而摩擦系数和磨损率较低。

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