Mechanical properties of three-dimensional interconnected alumina/steel metal matrix composites

Abstract

Three-dimensional interconnected alumina/ steel metal matrix composites (MMCs) were produced by pressureless Ti-activated melt infiltration method using three types of Al 2 O 3 powder with different sizes and shapes. By partial sintering during infiltration an interpenetrating ceramic network was realised. The effect of the ceramic particle size and shape on the resulting ceramic network, volume % fraction and the MMC properties is presented. The MMCs were characterised for mechanical properties at room temperature and elevated temperature. An increase in flexural strength and Young's modulus with decreasing particle size has been observed. In addition, the effect of the volume of ceramic content and the surface finish of the MMCs on the wear behaviour is shown.

Metal‐Matrix Materials for High‐Temperature Applications with Liquid Aluminum

“…Minor fractions of metastable zirconia particles showing a martensitic phase transformation under loading can further improve the mechanical properties of similar composite materials. Yet, high‐temperature applications of such material combinations have rarely been reported since the TRIP effect is restricted to moderate temperatures …”

Processing and mechanical properties of three-dimensional network alumina ceramic/alloy steel composites

“…As shown in Table 2, the calculated maximum bending strength value of the MMC specimen reaches to 889 MPa, which is much higher than that of the MMCs produced by steel melt infiltrating Ti-activated alumina particles [7,12]. Remaining of porous areas without melts infiltration and transgranular cracking failure of the unconnected ceramic particles result in the lower strength of the MMCs based on ceramic particles [12]. In the case of the present network MMCs, each phase contributes to the final properties.…”

“…It can be found that, for the two materials, with the increase of the normal load values, the worn depths of the wear scars gradually increase; whereas friction coefficients appreciably decrease contrarily. However, a relative lower depth value of the wear scar appears in the [7] ≤ 282 Interconnected particles [12] ≤ 605 3-D network skeletons 819 -889 MMCs when the load value is equal, which is corresponding to slight damage compared with the pure steel matrix. Moreover, the pure steel matrixes exhibit larger fluctuations of friction coefficients versus fretting cycles number than the MMCs, demonstrating the latter has better fretting wear stability [13].…”

Cellular SiC/Iron Alloy Composite

“…The preparation of this kind ceramic material can be carried out by e.g. by sintering the fractionated grains [10][11][12][13][14], gelling a foamed ceramic suspension [6,8,[15][16][17] or using open-cell polymer foam.…”