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Deformation mechanisms and the role of interfaces in deformation twinning of a two-phase[TiAl([gamma])/Ti[sub 3]Al([alpha][sub 2])] lamellar alloy creep deformed at elevated temperatures have been investigated. Since the multiplication of lattice dislocations within both[gamma] and[alpha][sub 2] lamellae is very limited at a low stress level due to a refined lamellar microstructure, the glide of interfacial dislocations on both[gamma]/[alpha][sub 2] and[gamma]/[gamma] interfaces (i.e interface sliding) becomes an important deformation mode. Obstacles such as impinged lattice dislocations can impede the movement of interfacial dislocations, which glide in a cooperative fashion along the lamellar interfaces. The impediment of dislocation motion subsequently causes a dislocation pile-up in front of obstacles as creep strain accumulates. When the crystals deform at high stress level, deformation twinning becomes a predominant deformation mode. Deformation twins are found to nucleate from the interfaces as a result of a local stress concentration generated from dislocation pile-ups. It is suggested that the deformation twinning in lamellar TiAl/Ti[sub 3]Al crystals can be vieived as a stress relaxation process for the concentration of stress at the head of each dislocation pile-up. An interface-assisted twinning mechanism is accordingly proposed and discussed.
Solute effect on the creep resistance of two-phase lamellar TiAl with an ultrafine microstructure creep- deformed in a low-stress (LS) creep regime WHERE A NEARLY LINEAR CREEP BEHAVIOR WAS OBSERVED has been investigated. The resulted deformation substructure and in-situ TEM experiment reveals that interface sliding by the motion of preexisting interfacial dislocations is the predominant deformation mechanism in LS creep regime. Solute segregation at interfaces and interfacial precipitation caused by the segregation result in an increase of creep resistance in LS creep regime.
The symposium from Materials Week '97 dedicated to the memory of Lehigh University Professor David A. Smith covers all aspects of internal and external interfaces of materials, from atomistic calculations and experimental observations of structure to the role of interfaces in determining properties and their inclusion in materials engineering. This book provides researchers, teachers, and students with a review of current materials interface understanding.
The first book entirely dedicated to the topic emphasizes the relation between basic research and actual processing technologies. As such, it covers complex microstructures down to the nanometer scale, structure/property relationships and potential applications in key industries. From the contents: * Constitution * Thermophysical Constants * Phase Transformations and Microstructures * Deformation Behaviour * Strengthening Mechanisms * Creep * Fracture Behaviour * Fatigue * Oxidation Resistance and Related Issues * Alloy Design * Ingot Production and Component Casting * Powder Metallurgy * Wrought Processing * Joining * Surface Hardening * Applications and Component Assessment
Written by the leading experts in computational materials science, this handy reference concisely reviews the most important aspects of plasticity modeling: constitutive laws, phase transformations, texture methods, continuum approaches and damage mechanisms. As a result, it provides the knowledge needed to avoid failures in critical systems udner mechanical load. With its various application examples to micro- and macrostructure mechanics, this is an invaluable resource for mechanical engineers as well as for researchers wanting to improve on this method and extend its outreach.
This handbook is an excellent reference for materials scientists and engineers needing to gain more knowledge about these engineering materials. Following introductory chapters on the fundamental materials properties of titanium, readers will find comprehensive descriptions of the development, processing and properties of modern titanium alloys. There then follows detailed discussion of the applications of titanium and its alloys in aerospace, medicine, energy and automotive technology.
The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.