Portevin–Le Chatelier effect
E656452
The Portevin–Le Chatelier effect is a phenomenon in certain alloys where dynamic strain aging causes serrated yielding and jerky flow during plastic deformation under specific temperature and strain-rate conditions.
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
metallurgical phenomenon
ⓘ
plasticity phenomenon ⓘ |
| alsoKnownAs | PLC effect NERFINISHED ⓘ |
| associatedWith |
Lüders-like bands
ⓘ
dynamic strain aging ⓘ strain localization ⓘ surface markings on deformed specimens ⓘ |
| bandType |
type A bands
ⓘ
type B bands ⓘ type C bands ⓘ |
| cause | dynamic strain aging ⓘ |
| characterizedBy |
discontinuous plastic flow
ⓘ
jerky flow ⓘ serrated yielding ⓘ |
| dependsOn |
alloy composition
ⓘ
solute concentration ⓘ strain rate ⓘ temperature ⓘ |
| discoveredIn | early 20th century ⓘ |
| field |
materials science
ⓘ
physical metallurgy ⓘ |
| influences |
ductility of alloys
ⓘ
fatigue behavior ⓘ formability of metals ⓘ strain hardening behavior ⓘ |
| mechanism |
dynamic pinning and unpinning of dislocations
ⓘ
interaction between mobile dislocations and diffusing solute atoms ⓘ |
| modeledBy | constitutive models with negative strain-rate sensitivity ⓘ |
| namedAfter |
Albert Portevin
NERFINISHED
ⓘ
François Le Chatelier NERFINISHED ⓘ |
| observedAs | serrations in the flow stress during tensile testing ⓘ |
| observedUnder |
constant imposed strain rate
ⓘ
isothermal conditions ⓘ uniaxial tensile loading ⓘ |
| occursIn |
Al–Mg alloys
ⓘ
Ni-based alloys NERFINISHED ⓘ austenitic stainless steels ⓘ certain metallic alloys ⓘ low-carbon steels ⓘ |
| relevantTo |
sheet metal forming
ⓘ
structural integrity assessment ⓘ |
| requires |
specific strain-rate range
ⓘ
specific temperature range ⓘ |
| resultsIn |
localized plastic deformation bands
ⓘ
negative strain-rate sensitivity of flow stress ⓘ stress serrations on engineering stress–strain curves ⓘ |
| temperatureRegime | intermediate temperatures relative to alloy melting point ⓘ |
| typeACharacteristic | continuously propagating deformation bands ⓘ |
| typeBCharacteristic | hopping or intermittently propagating bands ⓘ |
| typeCCharacteristic | static randomly nucleated bands ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.