chapter 16 creep - ncku
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Mechanical Behaviour of Materials
Dr.-Ing. 郭 瑞 昭
Chapter 16 Creep
Introduction to creep
Creep : time-dependent plastic deformation at high temperature
Effect of temperature and stress on creep
Creep mechanism: Nabarro-Herring creep
The creep occurs by diffusion through the lattice
LLHND
dA 2
. σε =
−�
Creep mechanism: Coble creep
The creep occurs by diffusion along grain boundaries
gbGC Dd
A 3
. σε =�
Creep mechanism: dislocation movement
The creep occurs by diffusion along grain boundaries
mSA σε =�
.
Deformation Mechanism Maps
Alloys for high temperature applications
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