電気化学的方法によってTiAl表面に形成された2種類の水素化物の存在領域

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タイトル別名
  • The Region of Two Kinds of Hydrides Formed on the Surface of TiAl by Electrochemical Method
  • デンキ カガクテキ ホウホウ ニ ヨッテ TiAl ヒョウメン ニ ケイセイ サレタ 2シュルイ ノ スイソカブツ ノ ソンザイ リョウイキ

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We have previously suggested that two kinds of hydrides (MH) are formed on the surface of titanium aluminide (TiAl) after electrochemical treatment in sulfuric acid. However, it is difficult to distinguish between the two kinds of MH from the microstructure of the specimen using normal techniques. The purpose of this study is to clarify the extent of the region in which the two kinds of MH exist across the specimen’s cross section.<BR>Depth dependence of XRD patterns were obtained by mechanically removing thin layers from the surface. It was found that the MH with the hexagonal structure (MHHEX) exists in only the outer layers, while the MH with a tetragonal structure (MHTET) exists mainly in the inner layers. Thermal desorption spectrometry and quadrupole mass spectrometry of TiAl after electrochemical treatments and Ni plating showed a complicated spectrum curve. This was caused by the decomposition of the two kinds of MH formed on TiAl as well as the MH of the Ni-plating layers at different temperatures. SEM observations of the cross section showed that the region in which the two kinds of MH exist extended 10 μm from the surface of the TiAl, with the MHHEX region extending 2 μm from the surface. MHHEX region’s hydrogen concentration was highest. The decomposition temperature of MHTET was lower than that of MHHEX. This indicates that hydrogen atoms diffuse to region of higher hydrogen concentration, which means that MHHEX is more thermally stable and has more absorption sites than MHTET.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 64 (10), 862-868, 2000

    公益社団法人 日本金属学会

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