Influence of interfacial defects on the impact toughness of solid state diffusion bonded Ti-6 Al-4 V alloy based multilayer composites

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:563

Article

Cepeda-Jimenez, C. M.¹  Carreno, F.¹  Ruano, O. A.¹  Sarkeeva, A. A.²  Kruglov, A. A.²  Lutfullin, R. Ya² 

[1] CSIC, CENIM, Dept Met Phys, Madrid 28040, Spain

[2] Inst Met Superplast Problems, Ufa 450001, Russia

关键词: Ti-6 Al-4 V alloy;    Multi layer materials;    Diffusion bonding;    Delamination;    Interfacial toughness;    Damage tolerance;   

DOI  :  10.1016/j.msea.2012.11.052

来源: Elsevier

【 摘 要 】

Microstructure and mechanical properties, with emphasis in impact toughness behaviour, of two multilayer composites have been investigated. The multilayer materials are constituted by thirteen layers of high strength Ti-6 Al-4 V alloy. Stacked layers have been successfully joined by diffusion bonding considering two processing temperatures, 750 and 900 degrees C. The proportion of alpha/beta phase in the microstructure during diffusion bonding process determines the presence of pores at the interface, and therefore the mechanical properties of the composite material. Higher bcc beta phase proportion during diffusion bonding process at the highest temperature of 900 degrees C leads to high bonding degree, without noticeable toughness increase of the multilayer composite. In contrast, higher proportion of harder hcp alpha phase at 750 degrees C makes difficult the healing of interfacial pores, decreasing interfacial toughness and leading to a toughness value of the multilayer composite seven times higher than the reported value for the as-received Ti-6 Al-4 V alloy. (C) 2012 Elsevier B.V. All rights reserved.

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