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Kurihara, Kensuke*; Lobzenko, I.; Tsuru, Tomohito; Serizawa, Ai*
Keikinzoku, 72(2), p.47 - 53, 2022/02
Nanoclusters formed in Al-Mg-Si alloys affect the aging behavior of the alloys depending on the formation temperature. In the present study, first-principles calculations were carried out to evaluate the two- and three-body interactions between Mg, Si atoms and vacancies in the Al matrix and to estimate the effect of local bond structures on the formation of nanoclusters. Monte Carlo simulations were subsequently performed to investigate the stable structure of nanocluster formed in Al-Mg-Si alloy. We found that Mg-Si bond and Si-Vac bond were stable in Al matrix. The result showed that the solute atoms are easy to aggregate with another type of atoms and that Si atom had a strong attractive interaction with a vacancy. Mg-Si-vacancy three-body bond were more stable than Mg-Si two-body bond and Si-vacancy two-body bond in Al matrix. Therefore, vacancies were strongly trapped within the cluster region due to the stable local bonds composed of Mg and Si atoms which indicates that the nanoclusters in Al matrix were thermally stabilized by the stable bonds between solute atoms and vacancy. In addition, these results suggested that inner bonds of nanocluster played a significant role in not only the thermal stability but also the formation and growth behavior of nanoclusters during aging at low temperatures.
Tsuru, Tomohito
Keikinzoku, 70(2), p.73 - 81, 2020/02
Elements strategy becomes important to investigate alternative materials of rare metals. I have dedicated to establish a new approach based on computational methods. In the present paper, I propose two approaches based on first-principles and theory of dislocations. These methods are introduced to magnesium alloys.
Yamaguchi, Masatake; Tsuru, Tomohito; Ebihara, Kenichi; Itakura, Mitsuhiro
Keikinzoku, 68(11), p.588 - 595, 2018/11
no abstracts in English
Ebihara, Kenichi; Yamaguchi, Masatake; Tsuru, Tomohito; Itakura, Mitsuhiro
Keikinzoku, 68(11), p.596 - 602, 2018/11
Hydrogen embrittlement (HE) is considered as one cause of stress corrosion cracking. HE is a serious problem in the development of high strength aluminum alloy as with steels. For understanding HE, it is inevitable to know hydrogen trapping states in the alloys and it can be identified using thermal desorption spectrometry of H. In this study, we numerically simulated thermal desorption spectra of hydrogen in aluminum for a cylindrical and a plate specimens and interpreted the desorption peaks included in them on the basis of the trap site concentration and the trap energy. As a result, we found that the peak at the lowest-temperature side can result from grain boundaries and confirmed that the reported interpretation for other peaks is reasonable. We also obtained the result showing the possibility that the trap site concentration of defects changes during heating the specimens. This result may give a suggestion for the interpretation of temperature desorption spectra of steels.
Xu, P. G.; Akita, Koichi; Suzuki, Hiroshi; Moriai, Atsushi
Keikinzoku Gakkai Heisei-24-Nendo Dai-2-kai Kako To Netsu Shori Ni Yoru Yusen Hoi Seigyo Kenkyu Bukai Kokai Koenkai Shiryo, p.19 - 20, 2012/10
Xu, P. G.; Tomota, Yo*; Vogel, S. C.*
Keikinzoku Gakkai Heisei-24-Nendo Dai-2-kai Kako To Netsu Shori Ni Yoru Yusen Hoi Seigyo Kenkyu Bukai Kokai Koenkai Shiryo, p.21 - 22, 2012/10
no abstracts in English
Ooka, Norikazu; Ishii, Toshimitsu
Keikinzoku Yosetsu, 37(1), p.17 - 24, 1999/00
no abstracts in English
Ooka, Norikazu;
Keikinzoku Yosetsu, 36(4), p.169 - 174, 1998/00
no abstracts in English
Ooka, Norikazu;
Keikinzoku Yosetsu, 36(5), p.216 - 221, 1998/00
no abstracts in English
Ooka, Norikazu; ; *; *
Keikinzoku Yosetsu, 28(8), p.339 - 347, 1990/08
no abstracts in English
*; *; *; Ooka, Norikazu
Keikinzoku Yosetsu, 28(11), p.489 - 497, 1990/00
no abstracts in English
*; *; *; Ooka, Norikazu
Keikinzoku Yosetsu, 28(12), p.525 - 533, 1990/00
no abstracts in English
; ; ;
Keikinzoku Yosetsu, 25(9), p.29 - 39, 1987/09
no abstracts in English
; *; *
Keikinzoku Yosetsu, 24(1), p.2 - 14, 1986/00
no abstracts in English
; *; *
Keikinzoku Yosetsu, 24(3), p.108 - 116, 1986/00
no abstracts in English
; *; *
Keikinzoku Yosetsu, 24(2), p.51 - 58, 1986/00
no abstracts in English
;
Keikinzoku, 23(5), p.227 - 237, 1973/05
no abstracts in English
Keikinzoku Yosetsu, (131), p.457 - 464, 1973/00
no abstracts in English
; ;
Keikinzoku Yosetsu Gijutsu Kaishi, (116), p.337 - 345, 1972/00
no abstracts in English
;
Keikinzoku Yosetsu, (99), p.123 - 129, 1970/00
no abstracts in English