TY - JOUR
T1 - Comparison of precipitates between excess Si-type and balanced-type Al-Mg-Si alloys during continuous heating
AU - Matsuda, Kenji
AU - Ikeno, Susumu
AU - Matsui, Hiroaki
AU - Sato, Tatsuo
AU - Terayama, Kiyoshi
AU - Uetani, Yasuhiro
N1 - Funding Information:
The present study was conducted as a part of the “Nanotechnology Metal Project” supported by the New Energy and Industrial Technology Development Organization (NEDO) and The Japan Research and Development Center for Metals (JRCM).
PY - 2005/8
Y1 - 2005/8
N2 - Differential scanning calorimetry (DSC) curves were obtained from Al-1.0 mass pct Mg2Si (balanced) and Al-1.0 mass pct Mg2 Si -0.4 mass pct Si (excess Si) alloys, and precipitates corresponding to each peak at the DSC curve were interpreted by means of high-resolution transmission electron microscopy (HRTEM) observation in order to understand the precipitation sequence of metastable phases. Five peaks were obtained on the DSC curves, from which four were exothermic (A, C, D, and E) and one endothermic (B). Upon HRTEM observation, the peaks for the excess Si alloy were explained as follows: peak A-B: Guinier-Preston (GP) zones anal random-type precipitates; peak B: dissolution of the GP zones and the random-type precipitates, precipitation of the β″ phase; peak C: β″ phase and precipitation of type B; peak D: dissolution of the β″ phase; precipitation of type A and β″ phase; and peak E: dissolution of the type B, type A, and β″ precipitation of the (β + Si) phase. This result is quite different from that in the balanced alloy as follows: peak A-B: GP zones and random-type precipitates; peak B: dissolution of the GP zones and the random-type precipitates, precipitation of the parallelogram-type precipitate; peak C: parallelogram-type precipitate and precipitation of β″ phase; peak D: β″ phase, dissolution of parallelogram-type precipitate; and peak E: the β-(Mg2Si).
AB - Differential scanning calorimetry (DSC) curves were obtained from Al-1.0 mass pct Mg2Si (balanced) and Al-1.0 mass pct Mg2 Si -0.4 mass pct Si (excess Si) alloys, and precipitates corresponding to each peak at the DSC curve were interpreted by means of high-resolution transmission electron microscopy (HRTEM) observation in order to understand the precipitation sequence of metastable phases. Five peaks were obtained on the DSC curves, from which four were exothermic (A, C, D, and E) and one endothermic (B). Upon HRTEM observation, the peaks for the excess Si alloy were explained as follows: peak A-B: Guinier-Preston (GP) zones anal random-type precipitates; peak B: dissolution of the GP zones and the random-type precipitates, precipitation of the β″ phase; peak C: β″ phase and precipitation of type B; peak D: dissolution of the β″ phase; precipitation of type A and β″ phase; and peak E: dissolution of the type B, type A, and β″ precipitation of the (β + Si) phase. This result is quite different from that in the balanced alloy as follows: peak A-B: GP zones and random-type precipitates; peak B: dissolution of the GP zones and the random-type precipitates, precipitation of the parallelogram-type precipitate; peak C: parallelogram-type precipitate and precipitation of β″ phase; peak D: β″ phase, dissolution of parallelogram-type precipitate; and peak E: the β-(Mg2Si).
UR - http://www.scopus.com/inward/record.url?scp=24744471800&partnerID=8YFLogxK
U2 - 10.1007/s11661-005-0321-y
DO - 10.1007/s11661-005-0321-y
M3 - 学術論文
AN - SCOPUS:24744471800
SN - 1073-5623
VL - 36
SP - 2007
EP - 2012
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 8
ER -