Effect of Applied Stress on Bainitic Transformation in Cu-Zn-Al Alloy

Tabuchi, Masayuki; Marukawa, Kenzaburo; Takezawa, Kentaro

doi:10.2320/jinstmet1952.60.11_1058

Cited by 2 publications

(4 citation statements)

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“…The latter nature has been deduced from the composition analysis of transformation products by means of the analytical electron microscopy. [14][15][16][17][18][19][20] This nature has also been suggested in a previous paper, 8) in which the activation energy associated with the bainitic transformation has been measured. Traditionally, the problem setting on the transformation mechanism of bainites has been such an alternative one to ask which is the true mechanism between the shear process or the diffusional process.…”

Section: Introductionnsupporting

confidence: 72%

“…By this procedure, the transformation was expected to proceed to 5-10% of the saturation level. 8) Disc specimens cut out from these sheets were thinned electrolytically in a solution of phosphoric acid saturated with chromic acid. They were observed by an electron microscope (JEM200CX) at the accelerating voltage of 200 kV.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

“…On the other hand, there is plenty of evidence for the fact that the rate of the bainitic transformation is controlled by the diffusion of solute atoms. 8,[14][15][16][17][18][19][20] Now, we discuss how these two contributions, shear and diffusion, are incorporated in a single transformation mechanism. It will be shown that these two factors are not conflicting with each other but that they are compatible at the atomic level.…”

Section: An Atomic Model Of the Transformation Mechanismmentioning

confidence: 99%

“…[1][2][3][4][5][6] In previous papers, [7][8][9] it has been shown that the bainitic transformation in a copper alloy is significantly accelerated by the application of an external stress. This result strongly suggests that transformation products are associated with a transformation strain, probably of the shear type.…”

Section: Introductionnmentioning

confidence: 99%

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Analysis of the Transformation Strain of Bainites in Cu-Zn-Al Alloys by Utilizing Interference Fringes in TEM Images

Marukawa

Tabuchi

2003

Mater. Trans.

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In order to clarify the mechanism of the bainitic transformation, a new technique utilizing interference fringes in transmission electron micrographs was applied for observations of bainitic precipitates in copper alloys. Based on the theoretical consideration of image formation, the appearance of these fringes along the interface of a precipitate was taken to be evidence of the existence of a shear-type transformation strain. From the analysis on the spacing of interference fringes, the direction and magnitude of the shear strain were obtained. It was found that the shear strain associated with bainites has almost the same crystallographic direction and magnitude as the one associated with martensites in the same alloy. On the basis of these findings, a new model on the transformation mechanism is presented, in which the dislocation motion bringing about the lattice transformation is controlled by the atomic diffusion through a local concentration change. This model consistently explains both of existence of the transformation strain and the diffusion-control nature of the transformation.

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Section: Introductionnsupporting

confidence: 72%

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

Section: An Atomic Model Of the Transformation Mechanismmentioning

confidence: 99%

Section: Introductionnmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of the Transformation Strain of Bainites in Cu-Zn-Al Alloys by Utilizing Interference Fringes in TEM Images

Marukawa

Tabuchi

2003

Mater. Trans.

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In situheating SEM observation of the bainitic transformation process in Cu–17Al–11Mn (at.%) alloys

Motomura¹,

Soejima²,

Miyoshi³

et al. 2015

Microscopy (Tokyo)

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To understand the bainitic transformation behavior in Cu-17Al-11Mn (at.%) alloys, dynamicin situobservation during heating was carried out in a scanning electron microscope (SEM). In this study, after optimizing the sample preparation method and observation conditions, we successfully observed the transformation process with sufficient resolution and contrast. From the observation results, bainite is first formed preferentially at the grain boundaries of the parent phase. Bainite is also formed inside the grains to relax the elastic strain generated by the initial bainite. Regarding the growth mode, in the early stage of the transformation, bainite grows along the longitudinal direction, and in the late stage, it grows along the lateral direction. The growth rate of the bainite was also evaluated by continuous observation of the same plate. Dynamicin situobservation of a martensitic transformation in the same alloy was also performed to compare the growth mode with that of bainite, and it was found that the behavior is considerably different between bainitic and the martensitic transformations.

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Effect of Applied Stress on Bainitic Transformation in Cu-Zn-Al Alloy

Cited by 2 publications

References 0 publications

Analysis of the Transformation Strain of Bainites in Cu-Zn-Al Alloys by Utilizing Interference Fringes in TEM Images

Analysis of the Transformation Strain of Bainites in Cu-Zn-Al Alloys by Utilizing Interference Fringes in TEM Images

In situheating SEM observation of the bainitic transformation process in Cu–17Al–11Mn (at.%) alloys

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