TY - GEN
T1 - Heat treatment effects on self-assembling process of supersaturated thermal vacancies in B2-type FeAl and NiAl
AU - Tsunekane, Masafumi
AU - Yoshimi, Kyosuke
AU - Maruyama, Kouichi
PY - 2009/1/1
Y1 - 2009/1/1
N2 - A large number of thermal vacancies are frozen into B2-type aluminides in supersaturation by rapid cooling. In this paper, the self-assembling behavior of supersaturated thermal vacancies in FeAl and NiAl was investigated using single crystals by different scanning calorimetry (DSC) and transmission electron microscopy (TEM). Two irreversible exothermic peaks were observed in the DSC curve of FeAl single crystals quenched from high temperature. The density and arrangement of dislocations formed inside the FeAl single crystals varied widely in the temperature range corresponding to the larger exothermic reaction, and the size of pores formed near surfaces increased with increasing temperature. An irreversible exothermic peak was also observed in the DSC curve of NiAl single crystal. The density and arrangement of dislocations formed inside the NiAl single crystals hardly varied in the temperature range corresponding to the exothermic reaction, but the size of pores formed near surfaces increased with increasing temperature.
AB - A large number of thermal vacancies are frozen into B2-type aluminides in supersaturation by rapid cooling. In this paper, the self-assembling behavior of supersaturated thermal vacancies in FeAl and NiAl was investigated using single crystals by different scanning calorimetry (DSC) and transmission electron microscopy (TEM). Two irreversible exothermic peaks were observed in the DSC curve of FeAl single crystals quenched from high temperature. The density and arrangement of dislocations formed inside the FeAl single crystals varied widely in the temperature range corresponding to the larger exothermic reaction, and the size of pores formed near surfaces increased with increasing temperature. An irreversible exothermic peak was also observed in the DSC curve of NiAl single crystal. The density and arrangement of dislocations formed inside the NiAl single crystals hardly varied in the temperature range corresponding to the exothermic reaction, but the size of pores formed near surfaces increased with increasing temperature.
KW - B2-type aluminides
KW - Differential scanning calorimetry (DSC)
KW - Point defects
KW - Transmission electron microscopy (TEM)
KW - Vacancies
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M3 - Conference contribution
AN - SCOPUS:84928168207
T3 - Proceedings of the 17th IFHTSE Congress
SP - 292
EP - 295
BT - Proceedings of the 17th IFHTSE Congress
PB - The Japan Society for Heat Treatment (JSHT)
T2 - 17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008
Y2 - 26 October 2008 through 28 October 2008
ER -