Interfacial structures and mechanical properties of steel–Ni and steel–Ti diffusion bonds |
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Authors: | HIROSHI KATO SHOJI ABE TOSHIHIKO TOMIZAWA |
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Affiliation: | (1) Department of Mechanical Engineering, Faculty of Engineering, Saitama University, 255 Shimo-Okubo, Urawa Saitama 338, Japan |
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Abstract: | Static and fatigue shear tests of steel–Ni bonds and steel–Ti bonds were carried out to obtain the relations between the strengths
and the bonding conditions. Ultrasonic measurements were also made to examine the relations between the strengths and the
size of the bonded region (the estimated diameter). At the bonding interface of the steel–Ni bonds, no intermediate phase
was observed. At the bonding interface of the steel–Ti bonds, a thin layer of intermetallic compound was formed at lower bonding
temperatures but, at higher bonding temperatures, the interlayer melted and the bonding interface became rough. The intensity
of the ultrasonic wave reflected from the bonding interface changed, depending on the state of the bonding interface. In shear
tests of the steel–Ni and steel–Ti bonds, cracks propagated along the bonding interface, and the strength was proportional
to the square of the estimated diameter. In fatigue tests, cracks propagated in the thickness direction of the plate and no
relation was obtained between the fatigue life and the estimated diameter. Fatigue life distributions were represented by
two- and three-parameter Weibull distributions.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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