Govind Kumar, Research Scholar at DM, IISc, supervised by Prof. Satyam Suwas and Prof. Satish V Kailas won the Best Poster Award for his presentation titled: “Development of a shear-based Severe Plastic Deformation ( SPD) process” under the “Metal Forming” category at the International Symposium on Transformational Technologies in Materials & Manufacturing, Indian Institute of Metals – 78th Annual Technical Meeting 2024 (IIM ATM 2024), 20-22 November 2024, GKVK Bengaluru.
Abstract: Materials are processed for their application primarily by deformation. The choice of using a particular processing technology is driven by the mechanical properties of the processed material. Imparting large strains into metal is known to improve the mechanical properties, especially the strength of the material. The strength of metal, in general, is governed by grain size. In this work, a new Severe Plastic Deformation (SPD) process has been developed to impart a large shear and a small compressive strain into the material, in a single-step operation. Commercially Pure (CP) aluminum cuboidal shape billets were subjected to 84% reduction in thickness. The processing was carried out by varying the operating parameters for the same thickness reduction, for several samples, to tailor the mechanical properties of the materials. From the obtained results, the effect of the variation in processing parameters on the properties of the material can be easily examined. The mechanics of the process is established and the von Mises equivalent strain has been calculated which is in the SPD range. Microstructural investigations show enormous stretching of the grains and the formation of sub-grains. The frequent change of strain path with the deformation leads to the fragmentation of the grains heavily to reach the steady state regime of grain size, ∼1 micron.
A threefold increase in the strength of the material has been observed with a strong shear texture.
The Annual Technical Meeting (ATM) of the Indian Institute of Metals (IIM) is a flagship event, annually drawing participants from various sectors of industry, academia, and R&D institutions. Metallurgists, materials scientists, and engineers converge from across the nation, representing a diverse array of backgrounds. This gathering stands as a platform for extensive knowledge-sharing, where participants exchange insights, experiences, and novel ideas.
