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Fatigue behaviour of Ni 3 Al(B) alloys at room temperature
Author(s) -
Li Gang,
Guo JianTing,
Wang ZhongGuang,
Shi ChangXu
Publication year - 1994
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199401192
Subject(s) - eutectic system , materials science , alloy , metallurgy , boride , grain boundary , boron , mole fraction , crystallite , phase (matter) , fracture (geology) , stress (linguistics) , grain size , microstructure , composite material , thermodynamics , chemistry , linguistics , physics , philosophy , organic chemistry
The high cycle fatigue behaviour of high boron polycrystalline Ni 3 Al alloys is studied. A single phase Ni 3 Al alloy with a mole fraction of 0.6% B and a Ni 3 Al alloy containing a mole fraction of 1.0% B with a small amount of the boride eutectic at the grain boundaries are selected for investigation. High cycle fatigue tests at room temperature with R (minimum stress/maximum stress) 0.1 are conducted in air and at 30 Hz. The results show that the Ni 3 Al(0.6% B) alloy is better than the Ni 3 Al(1.0% B) alloy in the fatigue resistance, although, the latter is much higher than the former in static strengths. The fatigue fracture surfaces are observed by SEM.