arc - auxi
- attractive Coulomb potential energy
- attrition test
- attrition testing machine
- attritioning
- attritions wear
- attritor
- attritor grinding
- Audiolloy
- auerbachite
- auger extruder
- Auger transition
- augmented core print
- augmented-core print
- aural detector
- auriferous ores
- auriferous pyrites
- aurum
- aus-bay quenching
- Ausforging
- ausforming
- Ausrolling
- austempered ductile iron
- austempering
- austenite
- austenite composition
- austenite conditioning
- austenite field
- austenite grain
- austenite hardener
- austenite instability
- austenite microstructure
- austenite recrystallization
- austenite region
- austenitic
- austenitic alloy
- austenitic area
- austenitic condition
- austenitic grain size
- austenitic iron
- austenitic manganese steel