M.B.Peterson(Wear Sciences Corporation
,
Arnold
,
Maryland
,
USA)Shizhuo LI(Institute of Metal Research
,
Chinese Academy of Sciences
,
Shenyang 110015
,
China)S.F.Murray(Rensselaer Polytechnic Institute
,
Thoy
,
New York
,
USA)
材料科学技术（英）
A study was conducted to develop low-friction, wear-resistant surfaces on high temperature alloys for the temperature range from 26℃ to 900℃. The approach investigated consists of modifying the naturally occurring oxide film in order to improve its tribological properties. Improvement is needed at low temperatures where the oxide film, previously formed at high temperature, spalls due to stresses induced by sliding. Experiments with Ti, W and Ta additions show a beneficial effect when added to Ni and Ni-base alloys. Low friction can be maintained down to 100℃ from 900℃. For unalloyed Ni friction and surface damage increases at 400℃ to 500℃. Two new alloys were perpared based on the beneficial results of binary alloys and ZrO2 diffusion in Ni.Low friction at temperature above 500℃ and reasonable values (0.32~0.42) at low temperature are obtained.
关键词:
STOLOFF
,
N.S. and ALVEN
,
D.A.(Department of Materials Engineering Rensselaer Polytechnic Institute Troy
,
New York
,
12180-3590
,
USA)
金属学报(英文版)
This paper reviews recent research on embrittlement of iron aluminides brought about by exposure to moisture or hydrogen. The tensile and fatigue crack growth behavior of several Fe-Al alloys, ranging in aluminum content from 16 to 35a%, is described. It will be shown that tensile ductility and fatigue crack growth behavior are dependent on type and degree of long range order, grain structure, temperature and environment. Environments studied include vacuum,oxygen, hydrogen gas, electrolytically charged hydrogen and moist air. All cases of embrittlement are ultimately traceable to the interaction of hydrogen with the lattice.
关键词:
: aluminides
,
null
,
null
,
null
,
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