High temperature oxidation behaviour of a Ni based superalloy produced by mechanical alloying

Scientific Research and Essays

Mehmet ERDEM¹ 

关键词:  ;    Mechanical alloying;     ;    powder metallurgy;    oxidation;     ;    microstructure;    superalloy.;   

DOI  :  10.5897/SRE11.1823

学科分类：社会科学、人文和艺术（综合）

来源: Academic Journals

【 摘 要 】

In this study, Ni based superalloy powders(75% Ni, 20% Cr, 4% Al2O3, 0.6% Ti and 0.4% Y2O3),were mechanically alloyed for up to 8 h and were compacted and sintered at 1200°C. Sintered samples were hot-deformed at 1200°C for various amounts and secondary recrystallisation was applied at 1325°C for 1 h. Isothermal oxidation tests were conducted at 1000°C for up to 100 h in air. Surface morphology, fractured surface and chemical composition of the samples were analyzed by usingx-ray diffraction(XRD) andscanning electron microscopy(SEM).Cr2O3film formed on the surface of the samples after exposure in air. Weight change results indicated the samples gained a small weight by increasing the exposure time. All samples exhibited sub-parabolic oxidation behavior.

【 授权许可】

CC BY