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

作者：Alam Md Zafir^*; Kamat S V; Jayaram V; Karamched Phani S; Ghosal P; Das D K

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2014, 604: 18-22.

DOI：10.1016/j.msea.2014.03.007

• Free-standing Pt-aluminide coating
• Tension test
• Dynamic recovery and recrystallization
• Texture

Free-standing Pt-aluminide (PtAl) bond coat, when subjected to tensile testing at high temperatures (T %26gt;= 900 degrees 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 %26lt; 110 %26gt; texture.

• 出版日期2014-5-16