Strain distribution in copper tensile specimens prestrained in rolling

• Tipo: Artigo em Revista Científica Internacional
• Data: 1997

Autores

Fernandes, JV (Autor) Outra; Vieira, MF (Autor) FEUP

Revista

Título: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Vol. 28

Páginas: 1169-1179

ISSN: 1073-5623

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 21 Citações

Scopus - 23 Citações

Classificação Científica

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia mecânica > Metalurgia

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

Outras Informações

ID Authenticus: P-001-BHZ

DOI: 10.1007/s11661-997-0282-4

Abstract (EN): Sequences of orthogonal rolling-tension experiments were performed on polycrystalline copper sheets. The effect of strain path change on subsequent yield and flow behavior has been investigated. Optical microscopy and transmission electron microscopy (TEM) were used to clarify the physical mechanisms occurring during the second deformation. The observed increase in yield stress in reloading was related to the change of slip systems corresponding to the glide of dislocations with a Burgers vector, which had not been active during prestrain. The transient observed in the work-hardening behavior after the path change corresponds to the appearance of disorganization in the dislocation microstructure. It was shown that no special feature of slip behavior inside the grains can be related to the nonhomogeneous surface deformation observed at the beginning of reloading. Also, the plastic instability of prestrained samples corresponding to the maximum load in tension does not seem to be directly controlled by the developed local substructure. The nonuniform deformation observed in reloading was studied using a simplified macroscopic two-zone model. It takes into account the presence of geometrical defects in the samples and considers the importance of the mechanical behavior. The macroscopic results, concerning the delay of starting deformation in some regions, are explained by the model, which allows formulation of an analytical condition necessary for deformation to spread through the length of the sample before necking takes place.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11