TY - JOUR
T1 - Aging behavior of ultrafine-grained Al-Mg-Si-X (X=Cu, Ag, Pt, Pd) alloys produced by high-pressure torsion
AU - Akama, Daichi
AU - Lee, Seungwon
AU - Horita, Zenji
AU - Matsuda, Kenji
AU - Hirosawa, Shoichi
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2012
Y1 - 2012
N2 - Age-hardenable Al-Mg-Si alloys containing an additional element of either Ag, Cu, Pt or Pd were processed by high-pressure torsion (HPT) and they were subsequently aged at a temperature of 373 K for up to a total period of 5400 ks. It was found that, in all alloys, the grain sizes after HPT were refined to 300-400 nm and there were significant increases in the hardness through the HPT processing. The hardness was further increased by the subsequent aging treatment, confirming the simultaneous strengthening by grain refinement and fine precipitation. However, the aging behavior was different depending on the alloying compositions. In the Cu-added excess Mg alloy, the hardness increase was large and the higher hardness retained for longer aging time when compared with those of non-added alloys. It was suggested that the precipitation of a few particles within a single grain with the size of a few hundred nanometer contributes to appreciable age hardening.
AB - Age-hardenable Al-Mg-Si alloys containing an additional element of either Ag, Cu, Pt or Pd were processed by high-pressure torsion (HPT) and they were subsequently aged at a temperature of 373 K for up to a total period of 5400 ks. It was found that, in all alloys, the grain sizes after HPT were refined to 300-400 nm and there were significant increases in the hardness through the HPT processing. The hardness was further increased by the subsequent aging treatment, confirming the simultaneous strengthening by grain refinement and fine precipitation. However, the aging behavior was different depending on the alloying compositions. In the Cu-added excess Mg alloy, the hardness increase was large and the higher hardness retained for longer aging time when compared with those of non-added alloys. It was suggested that the precipitation of a few particles within a single grain with the size of a few hundred nanometer contributes to appreciable age hardening.
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U2 - 10.2464/jilm.62.448
DO - 10.2464/jilm.62.448
M3 - Article
AN - SCOPUS:84872719643
SN - 0451-5994
VL - 62
SP - 448
EP - 453
JO - Keikinzoku/Journal of Japan Institute of Light Metals
JF - Keikinzoku/Journal of Japan Institute of Light Metals
IS - 11
ER -