Energy Citations Database

Bibliographic Citation

 
Document
For copies of Journal Articles, please contact the Publisher or your local public or university library and refer to the information in the Resource Relation field.
For copies of other documents, please see the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or Document Availability.
Title The influence of stress triaxiality on the damage mechanisms in an equiaxed{alpha}/{beta} Ti-6Al-4V alloy
Creator/Author Helbert, A.L. ; Feaugas, X. ; Clavel, M. [Univ. de Technologie de Compiegne (France). Div. Mecanique]
Publication Date1996 Oct 01
OSTI IdentifierOSTI ID: 417861
Other Number(s)MMTAEB; ISSN 1073-5623
Resource TypeJournal Article
Resource RelationMetallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science ; VOL. 27 ; ISSUE: 10 ; PBD: Oct 1996
Subject36 MATERIALS SCIENCE ; TITANIUM BASE ALLOYS; STRESSES; DAMAGE; ALUMINIUM ALLOYS; VANADIUM ALLOYS; CHEMICAL COMPOSITION; GRAIN SIZE; TRANSMISSION ELECTRON MICROSCOPY; VOIDS; FRACTURES; NUCLEATION; STRAINS; PLASTICITY; INTERFACES; CLEAVAGE
Description/Abstract The influence of the stress triaxiality on void formation, void growth, and fracture was investigated for an equiaxed Ti-6Al-4V alloy. Void nucleation in the{alpha} phase was found to occur for a critical value of macroscopic plastic strain, whereas void nucleation at the{alpha}/{beta} interface also depends on triaxiality. Under low triaxiality and important plastic strain, voids appear and grow in the area where the microshear bands develop, with an angle close to 45 deg to the stress axis in the{alpha} particles. In contrast, with high triaxiality, voids nucleate preferably at the{alpha}/{beta} interfaces and grow perpendicular to the stress axis by a cleavage mechanism. In a middle range of triaxiality and plastic strain, voids nucleate in{alpha} because of the sufficient plastic strain and also at the{alpha}/{beta} interfaces because of the sufficient triaxiality ({chi}). Void growth occurs with an angle of 60 deg to the stress axis, since{chi} is not high enough to create cleavage and{epsilon}{sub p} is high enough to provide a ductile growth. Two types of fracture were identified and reported on a fracture map: under low triaxiality, failure appears by plastic instability, whereas for high triaxiality, the instability is induced by a void-growth process discussed with the help of Rice and Tracey`s approach.
Country of PublicationUnited States
LanguageEnglish
Formatpp. 3043-3058 ; PL:
System Entry Date2001 May 05

Top