کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1579732 | 1001230 | 2010 | 5 صفحه PDF | دانلود رایگان |

Aluminum–scandium alloys were prepared having different scandium additions of 0.2, 1.0 and 2.0 wt.% and these alloys were processed by equal-channel angular pressing (ECAP) at 473 K. The results show the grain refinement of the aluminum matrix and the morphology of the Al3Sc precipitates depends strongly on the scandium concentration. The tensile properties were evaluated after ECAP by pulling to failure at initial strain rates from 1.0 × 10−3 to 1.0 × 10−1 s−1. The Al–1% Sc alloy exhibited the highest tensile strength of ∼250 MPa at a strain rate of 1.0 × 10−1 s−1. This alloy also exhibited a superior grain refinement of ∼0.4 μm after ECAP where this is attributed to a smaller initial grain size and an optimum volume fraction of dispersed Al3Sc precipitates having both micrometer and nanometer sizes.
Journal: Materials Science and Engineering: A - Volume 527, Issue 6, 15 March 2010, Pages 1448–1452