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A Review of Different Creep Mechanisms in Mg Alloys Based on Stress Exponent and Activation Energy
Author(s) -
Athul Karuna Ratnakaran,
Pillai Uma Thanu Subramonia,
Srinivasan Amirthalingam,
Pai Bellambettu Chandrasekhara
Publication year - 2016
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201500393
Subject(s) - creep , materials science , climb , grain boundary sliding , diffusion creep , dislocation , metallurgy , activation energy , deformation mechanism , stress (linguistics) , magnesium , grain boundary , composite material , thermodynamics , microstructure , chemistry , linguistics , physics , philosophy
Magnesium being the lightest structural material, is being increasingly used in automotive industry but at elevated temperatures, alloys like AZ91D, AM60B, AM50A etc. exhibit poor creep resistance which hinders the powertrain applications. This article summarizes the various creep deformation mechanisms prevailing in magnesium alloys at elevated temperatures by the influence of elemental additions. The main creep mechanisms are found to be dislocation climb, diffusion creep, and grain boundary sliding. The variation of creep mechanisms for different Mg alloys with respect to the activation energy ( Q ), stress exponent ( n ) for different stresses and temperatures are reported.