TY - JOUR
T1 - Aging behavior and microstructure of aged excess Mg type Al-Mg-Si alloys after HPT processing
AU - Watanabe, Katsumi
AU - Maruno, Shun
AU - Matsuda, Kenji
AU - Lee, Seungwon
AU - Horita, Zenji
AU - Terada, Daisuke
AU - Saikawa, Seiji
AU - Hirosawa, Shoichi
N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2013
Y1 - 2013
N2 - The aging behavior of excess Mg type Al-Mg-Si alloy processed by high pressure torsion (HPT) and effect of Cu addition to this alloy have been investigated by hardness test and microstructure observation. The samples were solution heated, quenched, processed by HPT and aged. The hardness of HPT-processed samples increased about 100 HV rather than samples without HPT, and they showed hardening with peak hardness during aging. The level of hardness on alloys was increased by increasing with amount of Cu-addition. The mean grain size in HPT-processed samples was about 200-250 nm for each alloy. All HPT-processed alloys showed peak hardness during aging, and two Cu added alloys show positive value of age-hardening ability for the aging condition in this study. Precipitates in HPT-processed and aged samples existed on and near the grain boundaries, and a few small precipitates are found at some dislocations. According to the analysis of selected area diffraction (SAED) patterns, aluminum, Mg2Si and Q-phase are found in the HPT-processed and aged Cu-added alloys. The hardening of HPT-processed samples is probably caused by precipitation at the homogeneous grain boundary networks of 200-250 nm in the sample which acts as heterogeneous nucleation sites for alloys.
AB - The aging behavior of excess Mg type Al-Mg-Si alloy processed by high pressure torsion (HPT) and effect of Cu addition to this alloy have been investigated by hardness test and microstructure observation. The samples were solution heated, quenched, processed by HPT and aged. The hardness of HPT-processed samples increased about 100 HV rather than samples without HPT, and they showed hardening with peak hardness during aging. The level of hardness on alloys was increased by increasing with amount of Cu-addition. The mean grain size in HPT-processed samples was about 200-250 nm for each alloy. All HPT-processed alloys showed peak hardness during aging, and two Cu added alloys show positive value of age-hardening ability for the aging condition in this study. Precipitates in HPT-processed and aged samples existed on and near the grain boundaries, and a few small precipitates are found at some dislocations. According to the analysis of selected area diffraction (SAED) patterns, aluminum, Mg2Si and Q-phase are found in the HPT-processed and aged Cu-added alloys. The hardening of HPT-processed samples is probably caused by precipitation at the homogeneous grain boundary networks of 200-250 nm in the sample which acts as heterogeneous nucleation sites for alloys.
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U2 - 10.2464/jilm.63.406
DO - 10.2464/jilm.63.406
M3 - Article
AN - SCOPUS:84891723711
SN - 0451-5994
VL - 63
SP - 406
EP - 412
JO - Keikinzoku/Journal of Japan Institute of Light Metals
JF - Keikinzoku/Journal of Japan Institute of Light Metals
IS - 11
ER -