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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Portevin–Le Chatelier effect canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7330920 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Portevin–Le Chatelier effect Context triple: [Cottrell atmosphere, associatedWith, Portevin–Le Chatelier effect]
-
A.
Cottrell atmosphere
The Cottrell atmosphere is a localized cloud of solute atoms that forms around dislocations in a crystal lattice, reducing their mobility and influencing the material’s mechanical properties.
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B.
Cottrell-Boyce
Cottrell-Boyce is the distinctive hyphenated surname of British screenwriter and children's author Frank Cottrell-Boyce.
-
C.
Cottrell
Cottrell is an English-language surname of likely Welsh or Anglo-Norman origin, borne by various notable individuals in fields such as religion, science, and the arts.
-
D.
Landau–Peierls instability
Landau–Peierls instability is a theoretical prediction in condensed matter physics that shows how long-wavelength thermal fluctuations destroy true long-range positional order in low-dimensional crystalline systems.
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E.
Szilard–Chalmers effect
The Szilard–Chalmers effect is a nuclear chemistry phenomenon in which atoms that undergo neutron capture and become radioactive are chemically separated from their original, non-activated atoms due to recoil-induced disruption of their chemical bonds.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Portevin–Le Chatelier effect Target entity description: 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.
-
A.
Cottrell atmosphere
The Cottrell atmosphere is a localized cloud of solute atoms that forms around dislocations in a crystal lattice, reducing their mobility and influencing the material’s mechanical properties.
-
B.
Cottrell-Boyce
Cottrell-Boyce is the distinctive hyphenated surname of British screenwriter and children's author Frank Cottrell-Boyce.
-
C.
Cottrell
Cottrell is an English-language surname of likely Welsh or Anglo-Norman origin, borne by various notable individuals in fields such as religion, science, and the arts.
-
D.
Landau–Peierls instability
Landau–Peierls instability is a theoretical prediction in condensed matter physics that shows how long-wavelength thermal fluctuations destroy true long-range positional order in low-dimensional crystalline systems.
-
E.
Szilard–Chalmers effect
The Szilard–Chalmers effect is a nuclear chemistry phenomenon in which atoms that undergo neutron capture and become radioactive are chemically separated from their original, non-activated atoms due to recoil-induced disruption of their chemical bonds.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
metallurgical phenomenon
ⓘ
plasticity phenomenon ⓘ |
| alsoKnownAs | PLC effect ⓘ |
| 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
ⓘ
François Le Chatelier ⓘ |
| 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 ⓘ 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 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Portevin–Le Chatelier effect Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.