Effects of friction stir processing and artificial peak aging on erosion resistance of Al-11Si-4Cu-2Ni-0.7Mg cast alloy

Chung Wei Yang, Yun Han Chang, Truan Sheng Lui, Li Hui Chen

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Al-11Si-4Cu-2Ni-0.7Mg cast alloy, which contains large amount of coarse second phase particles including eutectic Si, δ (Al3CuNi) and τ1 (Al9FeNi), can be used in facilities encountering particle erosion. The aim of this study was thus to explore its erosion characteristic. According to the test results, the wear process is governed by ductile mode although it is also associated with brittle cracking of the second phase particles. Friction stir process can improve the erosion resistance by refining the coarse particles to suppress their chance of brittle cracking, also by dispersion strengthening of the otherwise coarse dendritic α-Al matrix. Further strengthening of α-Al by peak-aging (T4/T6) treatment leads to shifting of the impact angle of maximum erosion rate from 20° to 25°. The erosion resistance is generally raised by peak aging, except for some erosion conditions which are affected by shifting of the angle of maximum erosion rate.

Original languageEnglish
Pages (from-to)163-170
Number of pages8
JournalMaterials and Design
Volume40
DOIs
Publication statusPublished - 2012 Sep

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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