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Acta Metall Sin  2005, Vol. 41 Issue (6): 561-567     DOI:
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Microstructure and Thermal Stability of HVOF Spray Formed FeAl Thick Nanocoating
JI Gang; T.GROSDIDIER; HAO Shengzhi; LIAO Hanlin; DONG Chuang
Laboratoire d' Etudes et de Recherches sur les Matériaux; les Procédés et les Surfaces; EA 3316; Université de Technologie de Belfort-Montbéliard; Site de Sevenans; 90010 Belfort Cedex; France
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JI Gang; T.GROSDIDIER; HAO Shengzhi; LIAO Hanlin; DONG Chuang. Microstructure and Thermal Stability of HVOF Spray Formed FeAl Thick Nanocoating. Acta Metall Sin, 2005, 41(6): 561-567 .

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Abstract  A thick (5 mm) nanostructured Fe-40Al deposit was successfully elaborated by high velocity oxy-fuel (HVOF) spray forming of milled powder. Its microstructure was investigated by scanning electron microscopy (SEM), quantitative metallography, transmission electron microscopy (TEM), as well as micro-hardness measurements. The obtained results were compared to those of a thin (300 $\mu$m) nanostructured coating produced by the same HVOF spray parameters and feedstock powder in order to study the effect of the processing conditions on the microstructure formation and associated hardness. The thermal stability of the deposit was asserted by heat treatments and hardness measurements. Its high hardness, that is due to the retained nanostructured unmelted powder particles, is retained at temperature as high as 600 ℃.
Key words:  FeAl      thick nanocoating      spray forming      
Received:  14 September 2004     
ZTFLH:  TG174  

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https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2005/V41/I6/561

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