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
PY - 2014
Y1 - 2014
N2 - Age-hardenable Al Mg Si alloys containing additional elements of Ag, Cu, Pt or Pd were processed by high-pressure torsion (HPT) and they were subsequently aged at a temperature of 373K for up to a total period of 5,400 ks. It was found that, in all alloys, the grain sizes after HPT were refined to 300430nm 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 elements. In the Cu-added excess Mg alloy, the hardness increase was large and the igher 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 additional elements of Ag, Cu, Pt or Pd were processed by high-pressure torsion (HPT) and they were subsequently aged at a temperature of 373K for up to a total period of 5,400 ks. It was found that, in all alloys, the grain sizes after HPT were refined to 300430nm 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 elements. In the Cu-added excess Mg alloy, the hardness increase was large and the igher 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.
KW - Aluminummagnesiumsilicon alloy
KW - Grain refinement
KW - High-pressure torsion
KW - Precipitation hardening
KW - Transmission electron microscopy
UR - http://www.scopus.com/inward/record.url?scp=84896908136&partnerID=8YFLogxK
U2 - 10.2320/matertrans.L-M2014802
DO - 10.2320/matertrans.L-M2014802
M3 - 学術論文
AN - SCOPUS:84896908136
SN - 1345-9678
VL - 55
SP - 640
EP - 645
JO - Materials Transactions
JF - Materials Transactions
IS - 4
ER -