Creep properties of a Pt-aluminide coating
Creep properties of a Pt-aluminide coating
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DOI：
10.1016/j.actamat.2006.03.010
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发表时间：
2006-07
期刊：
影响因子：
9.4
通讯作者：
M. Taylor;H. Evans;E. Busso;Z. Qian
中科院分区：
文献类型：
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作者：
M. Taylor;H. Evans;E. Busso;Z. Qian
The tensile creep properties of a β-rich (Ni,Pt)Al diffusion coating have been determined at various strains over the temperature range 800–1000°C by deconvoluting the creep response of layered composite specimens under constant stress conditions. It is found that the creep strength of the diffusion coating tends to be higher than that of a similar coating tested previously by Pan et al. [Pan D, Chen MW, Wright PK, Hemker KJ. Acta Mater 2003;51:2205]. Associated with the higher strength is a relatively high creep activation energy (∼600kJ/mol) and a high stress dependence of creep rate which increases with creep strain from ∼6.8 at 1% strain to ∼9.4 at 9% strain. These high values and the associated high creep strength are attributed to the formation, at the creep temperatures, of a fine dispersion of second-phase particles, presumed to be γ′ and possibly α-Cr, within the β-(Ni,Pt)Al matrix. It is suggested that the extent of this transformation and, hence, the strengthening effect are related to the original aluminium and platinum content of the coating.
