Comparative tensile behavior of freestanding γ-γ′ and β-(Ni,Pt)Al bond coats and effect on tensile properties of coated superalloy
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- 作者：Md Zafir Alam ; zafir_in@rediffmail.com ; C. Parlikar ; D. Chatterjee ; Dipak K. Das
- 关键词：γ-γ&prime ; Coating ; Pt-aluminide coating ; Superalloy ; Microtensile ; Tensile ; Fracture
- 刊名：Materials & Design
- 出版年：2017
- 出版时间：15 January 2017
- 年：2017
- 卷：114
- 期：Complete
- 页码：505-514
- 全文大小：2924 K
- 卷排序：114
文摘
Microtensile testing of standalone γ-γ′ (40 μm thick) and β-(Ni,Pt)Al (50 μm thick) coatings carried out at RT and 870 °C. At RT, the γ-γ′ coating was strong and ductile whereas brittle fracture at low stress occurred in the β-(Ni,Pt)Al coating. At 870 ˚C, unlike the ductile β-(Ni,Pt)Al coating, the γ-γ′ coating exhibited intergranular fracture and limited ductility. The effect of the above bond coats on tensile behavior of CM-247LC DS superalloy has been comparatively examined. Brittle fracture of β-(Ni,Pt)Al and intergranular fracture of γ-γ′ coatings deteriorated the substrate tensile properties.