A further simulation study on the dual role of porosity in solid-particle erosion of materials

TitleA further simulation study on the dual role of porosity in solid-particle erosion of materials
Publication TypeJournal Article
Year of Publication2011
AuthorsLi DY, Chen Q, Cook B
Journal TitleWear
Volume271
Pages1325-1330
Date Published07
Type of ArticleArticle; Proceedings Paper
ISBN Number0043-1648
Accession NumberWOS:000294590200018
Keywordsalloy, behavior, composites, computer simulation, computer-simulation, matrix composites, microstructure, msdm, porosity, solid-particle erosion, wear-resistance
Abstract

Previously we investigated the effect of porosity on solid-particle erosion of metal-matrix composites (MMCs) using a dynamic wear simulation model and demonstrated a positive effect of porosity on the resistance of MMCs to erosion when the amount of pores was small. We have extended this work to other materials, including pure metal, ceramic, and ceramic-matrix composites (CMCs), in order to obtain a general view of the role that porosity plays in solid-particle erosion processes for a wider range of materials. In this work, we simulate the performance of Cu, TiC-Cu, AlMgB(14), TiB(2), and AlMgB(14)-TiB(2), which contain different amounts of porosity. It is demonstrated that a small amount of porosity has a positive effect on the erosion resistance of the metal but the beneficial effects diminish as the reinforcing phase is added. It appears that pores play a dual role: providing preferential sites for crack nucleation but forcing cracks to zigzag with elevated energy dissipation. Thus, a beneficial effect of porosity exists as long as the dual role is in an appropriate balance. However, porosity is always detrimental to ceramic materials, which are hard and brittle, susceptible to defects with low capability to absorb deformation energy, since the crack propagation in brittle materials only needs a small amount of input energy to generate fracture surfaces with little associated plastic deformation. (C) 2011 Elsevier B.V. All rights reserved.

DOI10.1016/j.wear.2010.11.028
Alternate JournalWear