Dynamic recovery and recrystallization during high-temperature tensile deformation of a free-standing Pt-aluminide bond coat

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• 作者：Md. Zafir Alam^a ; ^b ; ^{zafir_in@rediffmail.com" class="auth_mail} ; S.V. Kamat^a ; V. Jayaram^b ; Phani S. Karamched^a ; P. Ghosal^a ; D.K. Das^a
• 关键词：Free-standing Pt-aluminide coating ; Tension test ; Dynamic recovery and recrystallization ; Texture
• 刊名：Materials Science and Engineering: A
• 出版年：16 May, 2014
• 年：2014
• 卷：604
• 期：Complete
• 页码：18-22
• 全文大小：2416 K

文摘

Free-standing Pt-aluminide (PtAl) bond coat, when subjected to tensile testing at high temperatures (T鈮?00 掳C), exhibits significant decrease in strength and increase in ductility during deformation at strains exceeding that corresponding to the ultimate tensile strength (UTS), i.e., in the post-UTS regime. The stress-strain curve is also marked by serrations in this regime. Electron back scattered diffraction (EBSD) and transmission electron microscopy (TEM) studies suggest dynamic recovery and recrystallization (DRR) as the mechanisms for the observed tensile behavior in the coating. Activation energy values suggest vacancy diffusion assists DRR. The fine recrystallized grains formed after deformation had a strong 銆?10銆?texture.