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Stress evolution in a Pt-diffused gamma/gamma' bond coat after oxidation

DOI: 10.1016/j.surfcoat.2014.02.065 DOI Help

Authors: X. Zhao (Shanghai Jiao Tong University, China) , B. Cernik (University of Manchester/UMIST, U.K.) , C. C. Tang (Diamond Light Source) , S. P. Thompson (Diamond Light Source) , P. Xiao (School of Materials, University of Manchester, U.K.)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Surface And Coatings Technology , VOL 247 , PAGES 48 - 54

State: Published (Approved)
Published: May 2014
Diamond Proposal Number(s): 6443

Abstract: The residual stresses in a Pt-diffused ?/?? bond coat after oxidation were investigated using the curvature and X-ray sin2? techniques. Contrary to the ?-(Ni,Pt)Al, the Pt-diffused ?/ ?? bond coat was in compression at room temperature due to a lower coefficient of thermal expansion. The stresses measured by the curvature method mainly came from the thermal misfit between the bond coat and the substrate, which decreased as the oxidation time increased. However, the stresses measured by the X-ray sin2? method exhibited an opposite trend. This discrepancy can be attributed to the different origins of the stress evaluated by different techniques. It demonstrated that the lattice misfit between the ? and ?? phases exerted a significant influence on the micro-stress in the bond coat, and thus restricted the use of X-ray to measure the stress in the Pt-diffused ?/?? bond coat. In addition, the effect of stresses on the texture and rumpling behavior of the bond coat was also discussed.

Journal Keywords: Bond Coat; Stress; X-Ray; Platinum; Rumpling

Subject Areas: Materials

Instruments: I11-High Resolution Powder Diffraction

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