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A crystal plasticity based approach to establish role of grain size and crystallographic texture in the Tension–Compression yield asymmetry and strain hardening behavior of a magnesium–silver–rare earth alloy

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Journal of magnesium and alloys 2022年第9期10卷 2546-2562页

作者： Sourav Mishra F.Khan S.K.Panigrahi Department of Mechanical Engineering Indian Institute of Technology MadrasChennai 600036Tamil NaduIndia Applied magnesium Research Group Centre for Materials and Manufacturing for Futuristic MobilityIndian Institute of Technology MadrasChennai 600036Tamil NaduIndia School of Mechanical Engineering Vellore Institute of TechnologyVellore 632014Tamil NaduIndia

Existence of tension–compression yield asymmetry is a serious limitation to the load bearing capablities of magnesium alloys in a number of light weight structural *** present work is aimed at nullifying the tension to compression asymmetry problem and strain hardening anomalies in a magnesium–silver–rare earth alloy by engineering different levels of microstructural conditions via friction stir processing and post process *** existence and extent of yield asymmetry ratio in the range of microstructural conditions was experimentally obtained through quasistatic tensile and compression *** yield asymmetry problem was profoundly present in specimens of coarse grained microstructures when compared to their fine grained and ultra fine grained *** impact of the microstructure and associated mechanisms of plasticity on the macroscopic strain hardening behavior was established by Kock–Mecking’s *** plasticity simulations using Viscoplastic Self Consistency approach revealed the consequential role of extension twinning mechanism for the existence of yield asymmetry and anomalies in strain hardening *** was especially dominant with coarsening of grain *** Microscopy and characterization were conducted thoroughly in partially deformed specimens to confirm the predictions of the above *** role of crystallographic texture for inducing the polarity to Tension–Compression yield asymmetry was corroborated.A critical grain size in magnesium–silver–rare earth alloy was hereby established which could nullify influences of extension twinning in yield asymmetry ratio.

关键词： magnesium silver rare earth alloy Friction stir processing Ultrafine-grained microstructure Tension to compression yield strength asymmetry Crystallographic texture Strain hardening Kock mecking plots Visco plastic self consistency

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