Kyushu University · Engineering
Professor Avala Lavakumar's research lab specializes in physical metallurgy, materials science, and the mechanical behavior of advanced metallic materials. The lab focuses on understanding the microstructure-property relationships in steels—particularly transformation-induced plasticity (TRIP) steels, high-carbon and microalloyed steels—and explores advanced materials such as high-entropy alloys (HEAs) as novel binders for cemented carbides and cermets. Key research directions include indentation size effects, post-necking deformation behavior, dislocation dynamics, and phase transformations under mechanical loading, often employing in-situ synchrotron X-ray diffraction and advanced characterization techniques like EBSD and TEM.
Figures are computed from collected data and may differ slightly.
The progress of civilization can be, in part, attributed to our ability to employ metallurgy. This book is an introduction to multiple facets of physical metallurgy, materials science, and engineering. As all metals are crystalline in structure, attention is focussed on these structures, and how the formation of these crystals is responsible for certain aspects of the material's chemical and physical behaviour. The book also discusses the mechanical properties of metals, the theory of alloys, an
Indentation Size Effect (ISE) in steels having a wide spectrum of carbon (C) concentrations (wt-%) 0.002 (interstitial-free), 0.07 (microalloyed), 0.19 (low carbon), 0.32 (medium carbon), and 0.7 (high carbon), and microstructures were investigated using Vickers micro-hardness tester. A decrease in micro-hardness with increasing load, i.e. ISE, is observed in all the samples except microalloyed steel. The empirical relations, such as the Nix and Gao model, Minimum Resistance model, and Proportio
The current review gives an insight into high-entropy alloys (HEAs) as a new possible binder material for the tungsten carbides, heavy tungsten alloys, and titanium carbo-nitride (Ti(C,N)) based cermet composites. The existing binder materials (for instance, Co, Ni, etc.), produced by powder metallurgy methods, have limited tool bits performance and short service life while mining applications; however, replacing existing binders with more accurate binder material is still a great challenge for
Abstract Multi-phase steels showing transformation induced plasticity (TRIP), can exhibit an excellent combination of high strength and good ductility by the aid of martensitic transformation during deformation. Even though TRIP-assisted multi-phase steels have been widely used in industry, the role of each phase in the enhancement of mechanical properties is still unclear given their complicated microstructures. In order to understand better the nature of the TRIP effect, the mechanical interac
In general, the stress-strain relationship of materials obtained by standard uniaxial tensile test, which can identify the hardening behavior only up to necking. Beyond necking, the material behavior is usually estimated by extrapolating or numerical modelling based on hardening behavior prior to the uniform elongation. This study investigated the post-necking hardening behavior of a fully martensitic steel by in-situ synchrotron X-ray diffraction during tensile deformation. From the in-situ res
TRIP-assisted multiphase steels are gradually finding employment in the automotive industry for their excellent strain-hardening characteristics. In the current study, in a comparatively lean composition steel, different combinations of multiple phases such as ferrite, austenite and martensite, were obtained by heat-treatment, consisting of Inter-critical annealing followed by partitioning treatment for different holding times. It was observed that, with increasing isothermal holding time, the v
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