A wide class of
materials - metals, ceramics, intermetalics, nanocrystaline,
polymer, etc - show superplastic behavior under special
processing conditions. The most important characteristic of
a superplasticmaterialis its high strain rate sensitivity of flow
stress that confers a high resistance to neck development and
results in the high tensile elongations characteristic of
superplastic behavior. Superplastically deformed material in
tensile tests gets thinner in a very uniform manner, rather
than forming a ’neck’ (a local narrowing), which leads to
fracture [22].
A wide class ofmaterials - metals, ceramics, intermetalics, nanocrystaline,polymer, etc - show superplastic behavior under specialprocessing conditions. The most important characteristic ofa superplasticmaterialis its high strain rate sensitivity of flowstress that confers a high resistance to neck development andresults in the high tensile elongations characteristic ofsuperplastic behavior. Superplastically deformed material intensile tests gets thinner in a very uniform manner, ratherthan forming a ’neck’ (a local narrowing), which leads tofracture [22].
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