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Dynamic recrystallization as a potential cause for adiabatic shear failure.

D Rittel¹, P Landau, A Venkert

¹Faculty of Mechanical Engineering, Technion, Haifa, Israel. merittel@technion.ac.il

Physical Review Letters

|November 13, 2008

Summary

Dynamic recrystallization (DRX) in Ti6Al4V occurs before adiabatic shear bands form, indicating microstructural changes initiate failure. This suggests material softening, not just thermal effects, drives band generation.

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Area of Science:

Materials Science
Metallurgy
Mechanical Engineering

Background:

Dynamic recrystallization (DRX) is typically observed in adiabatic shear bands.
DRX is commonly attributed to high temperatures and local strains within these bands.

Purpose of the Study:

To investigate the occurrence of DRX in Ti6Al4V under impact loading below adiabatic shear band formation.
To determine if DRX precedes or causes adiabatic shear band development.

Main Methods:

Impact loading of Ti6Al4V alloy specimens.
Microstructural analysis to observe dynamically recrystallized nanograins.

Main Results:

Dynamically recrystallized nanograins were observed in Ti6Al4V at impact strains significantly lower than those causing adiabatic shear bands.
DRX was found to occur prior to the development of adiabatic shear bands.

Conclusions:

Dynamic recrystallization is a precursor to adiabatic shear failure in Ti6Al4V.
DRX is a significant micromechanical factor in the initiation of adiabatic shear bands.
Adiabatic shear failure involves microstructural evolution and material softening preceding thermal softening.