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Journal Articles

Effects of local bonding between solute atoms and vacancy on formation of nanoclusters in Al-Mg-Si alloys

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.

Journal Articles

Alloy design for improvement of ductility and toughness in magnesium alloy; First-principles-calculation approaches

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.

Journal Articles

Surface energy reduction by dissociative hydrogen adsorption on inner surface of pore in aluminum

Yamaguchi, Masatake; Tsuru, Tomohito; Ebihara, Kenichi; Itakura, Mitsuhiro

Keikinzoku, 68(11), p.588 - 595, 2018/11

no abstracts in English

Journal Articles

Interpretation of thermal desorption spectra of hydrogen from aluminum using numerical simulation

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.

Journal Articles

Establishment and application of texture evaluation technical environment by angle dispersive neutron diffraction

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

Journal Articles

Crystallographic observation of diffusional phase transformation behavior of a low alloy steel using neutron diffraction

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

Journal Articles

Penetrant testing

Ooka, Norikazu; Ishii, Toshimitsu

Keikinzoku Yosetsu, 37(1), p.17 - 24, 1999/00

no abstracts in English

Journal Articles

X-ray radiography

Ooka, Norikazu;

Keikinzoku Yosetsu, 36(4), p.169 - 174, 1998/00

no abstracts in English

Journal Articles

Ultrasonic testing

Ooka, Norikazu;

Keikinzoku Yosetsu, 36(5), p.216 - 221, 1998/00

no abstracts in English

Journal Articles

Experiments on compatibility of U$$_{3}$$Si$$_{2}$$ and aluminium at high temperature in out-pile

Ooka, Norikazu; ; *; *

Keikinzoku Yosetsu, 28(8), p.339 - 347, 1990/08

no abstracts in English

Journal Articles

Journal Articles

Journal Articles

Trends of non destructive inspection

; ; ;

Keikinzoku Yosetsu, 25(9), p.29 - 39, 1987/09

no abstracts in English

Journal Articles

Study on application of contrastmeter in radiographic examination

; *; *

Keikinzoku Yosetsu, 24(3), p.108 - 116, 1986/00

no abstracts in English

Journal Articles

Study on application of contrastmeter in radiographic examination (II)

; *; *

Keikinzoku Yosetsu, 24(2), p.51 - 58, 1986/00

no abstracts in English

Journal Articles

Activation analysis of light metals

;

Keikinzoku, 23(5), p.227 - 237, 1973/05

no abstracts in English

Journal Articles

Technical discussion for radiographic examination of fusion welded circumferential but joints

Keikinzoku Yosetsu, (131), p.457 - 464, 1973/00

no abstracts in English

Journal Articles

The safety evaluation test of cold pressed Al capsule for radioisotope production

; ;

Keikinzoku Yosetsu Gijutsu Kaishi, (116), p.337 - 345, 1972/00

no abstracts in English

Journal Articles

Present Status of Leak Detecting Methods

;

Keikinzoku Yosetsu, (99), p.123 - 129, 1970/00

no abstracts in English

25 (Records 1-20 displayed on this page)