age hardening
C2 (Very Low Frequency / Specialized Technical)Highly technical/specialized. Primarily used in materials science, metallurgy, and engineering contexts.
Definition
Meaning
The process by which the strength and hardness of a metal or alloy increases over time at room temperature (natural ageing) or after heat treatment (artificial ageing).
A strengthening mechanism where solute atoms diffuse and form finely dispersed particles within the metal's crystalline structure, impeding dislocation movement and increasing mechanical properties. Can be used metaphorically to describe a process of becoming more rigid or resistant over time.
Linguistics
Semantic Notes
Specifically refers to a time-dependent change in material properties after solution heat treatment and quenching. Distinct from 'work hardening' (cold working). The 'age' refers to the passage of time, not chronological years.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling follows national conventions (e.g., 'hardening' vs. 'hardening').
Connotations
Identical technical connotations.
Frequency
Equally rare outside specific technical fields in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
[Alloy] undergoes age hardening.[Process/Treatment] causes age hardening of [material].The [property] is improved by age hardening.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None. This is a technical term.”
Usage
Context Usage
Business
Extremely rare. Might appear in procurement or technical specifications for aerospace or automotive components.
Academic
Core term in materials science and metallurgy engineering papers and textbooks.
Everyday
Virtually never used.
Technical
The primary context. Used in research, manufacturing, quality control, and materials specification sheets.
Examples
By Part of Speech
noun
British English
- The aluminium alloy's strength is derived primarily from age hardening.
- Researchers studied the kinetics of the age hardening process.
American English
- The age hardening of the 7075 aluminum plate was critical for the aircraft's frame.
- They specified a T6 temper, which involves solution heat treatment and artificial age hardening.
Examples
By CEFR Level
- Some metals become stronger if they are heated and then left to cool slowly; this is called age hardening. (Simplified technical explanation).
- The superior yield strength of the component was attributed to a precise artificial age hardening cycle at 120°C for 24 hours.
- Differential scanning calorimetry was used to monitor the precipitation sequence during age hardening.
Learning
Memory Aids
Mnemonic
Think of an old, tough piece of leather that has hardened with AGE. Similarly, certain metals get harder as they 'age' after heat treatment.
Conceptual Metaphor
TEMPERING OF CHARACTER: A process that makes something stronger and more resistant through the passage of time or controlled stress.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'старение' in the biological sense. The direct technical translation is 'дисперсионное твердение' or 'старение' in a metallurgical context. Ensure the context is materials, not people.
Common Mistakes
- Using 'age hardening' to refer to the rusting or corrosion of metal over long periods (incorrect).
- Confusing it with 'case hardening' (surface hardening).
- Using it as a general synonym for 'getting old and inflexible' in non-technical writing (awkward metaphor).
Practice
Quiz
Which of the following is a key result of successful age hardening?
FAQ
Frequently Asked Questions
No. Work hardening (or strain hardening) occurs through plastic deformation (e.g., bending, rolling). Age hardening occurs due to microscopic precipitation within the material's structure over time, often after heat treatment.
No. Only certain alloys, primarily those containing elements like copper, magnesium, silicon, or zinc that can form precipitates, are susceptible to age hardening. Examples include many aluminium alloys (2000, 6000, 7000 series) and some steels.
Natural age hardening occurs slowly at room temperature. Artificial age hardening involves heating the material to an elevated temperature (e.g., 120-200°C) for a specified time to accelerate and control the process.
It refers to the passage of time required for the strengthening process, as the material's properties change while it 'ages' under specific conditions, not to chronological age in years.