Physics

Internal medicine

Finite element method

Forming processes

Strain rate

Creep

Composite material

Diffusion creep

Metallurgy

Materials science

Constitutive equation

Deformation (meteorology)

Deformation mechanism

Strain (injury)

Alloy

Atmospheric temperature range

Grain boundary

Metal

Viscoplasticity

Quantum mechanics

Medicine

Microstructure

Mechanism (biology)

Thermodynamics

International Journal of Machine Tools and Manufacture

In analysing metal forming processes the deformation mechanism map (elastic-plastic, elastic-viscoplastic, or creep type behaviour) for a particular process is commonly built solely in relation to temperature; which can be acceptable for a defined modest strain rate range. However, for a given temperature, if strain rate variation is large, the deformation mechanism could vary significantly. In this paper, a deformation mechanism map is proposed to clarify the interacting effect of deformation conditions (temperature and strain rate) on workpiece behaviour in metal forming processes. Rate type deformation equations which can be used to comprehensively model the effect of temperature and strain rate on deformation mechanism characteristics are elucidated and as examples, determined for Ti–6Al–4V and Al–Mg alloy.

Clarification of the effect of temperature and strain rate on workpiece deformation behaviour in metal forming processes