A STUDY OF THE CRYSTAL STRUCTURE OF TI-AL ALLOYS AND HYDROGEN INDUCED EXPANSIONS.
Final rept. 1 Jan 64-30 Sep 65,
NEW YORK UNIV NY ENGINEERING RESEARCH DIV
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The structure of a Ti-Al phase reported on gamma Ti3Al has been found by single crystal x-ray studies to be alpha Ti with superlattice spots of Ti3Al. A surface expansion, found to occur after etching alloys containing 9.5-12.5 wt Al, occurs as a result of hydrogen picked up by etching. It is proposed that hydrogen initially enters octahedral sites of Ti3Al coherent with alpha Ti and later shifts to the tetrahedral sites. It is postulated that expansion occurs when the hydrogen enters the tetrahedral sites. Author
- Properties of Metals and Alloys