𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A unified interpretation of threshold stresses in the creep and high strain rate superplasticity of metal matrix composites

✍ Scribed by Y Li; T.G Langdon

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
192 KB
Volume
47
Category
Article
ISSN
1359-6454

No coin nor oath required. For personal study only.

✦ Synopsis

AbstractÐThe ¯ow behavior of metal matrix composites is characterized by the presence of a threshold stress under both creep conditions at intermediate temperatures and in high strain rate superplasticity (HSR SP) at very high temperatures near the onset of partial melting. Experiments show the measured threshold stresses decrease with increasing temperature and this trend has been interpreted using an Arrhenius-type relationship incorporating an energy term, Q 0 . Typically, the experimental values reported for Q 0 are H20±30 kJ/mol under creep conditions but up to H100 kJ/mol in experiments associated with HSR SP. This report resolves this apparent dichotomy by demonstrating that both sets of results become consistent when the analysis is extended to incorporate an additional dependence on temperature associated with load transfer and substructure strengthening.

📜 SIMILAR VOLUMES

The effect of reinforcement clustering o
The effect of reinforcement clustering on the steady-state creep behaviors of discontinuous metal matrix composite: A possible origin of ‘anomalously high’ stress exponent
✍ W.J. Lee; S.K. Jo; I.M. Park; Y.H. Park 📂 Article 📅 2011 🏛 Elsevier Science 🌐 English ⚖ 810 KB

The effect of reinforcement clustering on the steady-state creep behaviors of unidirectional SiC whisker reinforced aluminum matrix composite was investigated using finite element models with two different microstructures: Homogeneous microstructure was made up of a random dispersion of whiskers and

Influence of particle volume fraction, s
Influence of particle volume fraction, shape, and aspect ratio on the behavior of particle-reinforced metal–matrix composites at high rates of strain
✍ Y. Li; K.T. Ramesh 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 808 KB

AbstractÐCompressive plastic deformation of particle-reinforced metal±matrix composites is investigated through numerical modeling at high rates of strain. The numerical modeling is performed using axisymmetric unit cell models, with the particles treated as elastic ellipsoids or cylinders embedded