| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 830587 | Materials & Design (1980-2015) | 2012 | 8 Pages |
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.
► We examined effects of FSP and peak aging on the particle erosion of Al–11Si–4Cu–2Ni–0.7Mg cast alloy. ► The Si, δ (Al3CuNi) and τ1 (Al9FeNi) particles can be refined and uniformly distributed by the FSP modification. ► The erosion resistance of FSP-modified alloy is improved by reducing the occurrence of second-phase particles breaking. ► The peak aging of α-Al raises the erosion resistance and shifts the impact angle of maximum erosion rate to a higher angle.
