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.

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.

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

X-ray radiography

Ooka, Norikazu;

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

http://ci.nii.ac.jp/naid/40000843181

no abstracts in English

Experiments on compatibility of USi and aluminium at high temperature in out-pile

Ooka, Norikazu; ; *; *

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

http://ci.nii.ac.jp/naid/40000842867

no abstracts in English

A Study on the ultrasonic testing of aluminum-alloy specimens with simulated defects, Part 2; Reliability of defect evaluation

*; *; *; Ooka, Norikazu

Keikinzoku Yosetsu, 28(12), p.525 - 533, 1990/00

http://ci.nii.ac.jp/naid/40000842891

no abstracts in English

Study on application of contrustmeter in radiographic examination, I; Quantitative relationship between image quality indicator and contrastmeter for aluminum welds

; *; *

Keikinzoku Yosetsu, 24(1), p.2 - 14, 1986/00

http://ci.nii.ac.jp/naid/40000842610

no abstracts in English

Study on application of contrastmeter in radiographic examination (II)

; *; *

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

http://ci.nii.ac.jp/naid/40000842613

no abstracts in English

Technical discussion for radiographic examination of fusion welded circumferential but joints

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

no abstracts in English

Present Status of Leak Detecting Methods

;

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

no abstracts in English