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Martensite structure in Ti–Ni–Hf–Cu quaternary alloy ribbons containing (Ti,Hf)2Ni precipitates / X.L. Meng in Acta materialia, Vol. 58 N° 10 (Juin 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3751–3763 Titre : Martensite structure in Ti–Ni–Hf–Cu quaternary alloy ribbons containing (Ti,Hf)2Ni precipitates Type de document : texte imprimé Auteurs : X.L. Meng, Auteur ; W. Cai, Auteur ; Y.D. Fu, Auteur Année de publication : 2011 Article en page(s) : pp. 3751–3763 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Ti–Ni–Hf–Cu  alloy  Microstructure  Martensite  Precipitates  Transmission  electron  microscopy Résumé : The martensite structure in a Ti36Ni44Hf15Cu5 ribbon annealed at different temperatures is investigated. When the annealing temperature is <873 K, spherical (Ti,Hf)2Ni particles 20–40 nm in diameter precipitate in the grain interior. Transmission electron microscopy analysis shows that (0 0 1) compound twins are dominant in the ribbon containing homogeneously distributed (Ti,Hf)2Ni precipitates. When the annealing temperature is 773 K, the boundaries between the martensite domains with the (0 0 1) twins are blurry and vague. When the annealing temperature is 873 K, four types of boundaries among the martensite domains are found: {1 1 1}, (0 0 1)//{1 1 1}, {1 1 3} and (1 1 0)//{1 1 3} types. When the annealing temperature is 973 K, the (0 1 1) twins become dominant, and the martensite variants show mainly spear-like and mosaic-like morphologies. However, martensite domains with (0 0 1) twins also exist around the coarse (Ti,Hf)2Ni precipitates. Fine (Ti,Hf)2Ni precipitates should be responsible for the improvement in shape memory effect and the superelasticity of Ti–Ni–Hf–Cu ribbons. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001606 [article] Martensite structure in Ti–Ni–Hf–Cu quaternary alloy ribbons containing (Ti,Hf)2Ni precipitates [texte imprimé] / X.L. Meng, Auteur ; W. Cai, Auteur ; Y.D. Fu, Auteur . - 2011 . - pp. 3751–3763. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3751–3763 Mots-clés : Ti–Ni–Hf–Cu  alloy  Microstructure  Martensite  Precipitates  Transmission  electron  microscopy Résumé : The martensite structure in a Ti36Ni44Hf15Cu5 ribbon annealed at different temperatures is investigated. When the annealing temperature is <873 K, spherical (Ti,Hf)2Ni particles 20–40 nm in diameter precipitate in the grain interior. Transmission electron microscopy analysis shows that (0 0 1) compound twins are dominant in the ribbon containing homogeneously distributed (Ti,Hf)2Ni precipitates. When the annealing temperature is 773 K, the boundaries between the martensite domains with the (0 0 1) twins are blurry and vague. When the annealing temperature is 873 K, four types of boundaries among the martensite domains are found: {1 1 1}, (0 0 1)//{1 1 1}, {1 1 3} and (1 1 0)//{1 1 3} types. When the annealing temperature is 973 K, the (0 1 1) twins become dominant, and the martensite variants show mainly spear-like and mosaic-like morphologies. However, martensite domains with (0 0 1) twins also exist around the coarse (Ti,Hf)2Ni precipitates. Fine (Ti,Hf)2Ni precipitates should be responsible for the improvement in shape memory effect and the superelasticity of Ti–Ni–Hf–Cu ribbons. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001606