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  4. № 19 2010
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Effect of Y on structure and properties of cast intermetallic Ті—36Al
1. Structure and hardness of cast Ті—36Al—Y alloy

I.Gorna,
 
A.V.Yablokova,
 
V.A.Tin´kov,
 
A.Kotko,
 
V.S.Goltvyanitsa,
 
S.K.Goltvyanitsa,
 
S.Firstov
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Modern Problems in Physical Materials Science - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2010, #19
http://www.materials.kiev.ua/article/2042

Abstract

Yttrium effect on structure, phase composition and hardness of cast intermetallic Ті— 36-wt. % Al alloy is studied. Small additions of Y (0,1—0,6%) are established to modify as-cast lamella alloy structure. Hypoeutectic structure consisting of (γ-TiAl) matrix and ((γ-TiAl) + (YAI2)) eutectic is formed in alloys with Y content of 0,8—5%. It is be noted that yttrium grains are observed practically in the structure of every alloy with Y addition. The determine phase and structure changes are resulted in nonmonotonic dependence of  Vickers hardness vs. Y concentration.


γ-TIAL ALLOYS, ALLOYING, HARDNESS, PHASE COMPOSITION, STRUCTURE, YTTRIUM

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