Heat Treatment of Aluminium Alloys
Most aluminium castings are used in the 'as cast' condition, but there are certain applications that require higher mechanical properties, or different properties from the as cast material. The heat treatment of aluminium castings is carried out to change the properties of the as cast alloys by subjecting the casting to a thermal cycle or series of thermal cycles. For sand castings and gravity die castings all heat treatments are possible, though not all are standardised. Pressure die castings however, cannot generally be heat treated.
The following are the suffixes used in the UK to indicate the heat treatment condition of BS1490 Aluminium Alloys:
- M As cast
- TS Thermally stress relieved, annealed
- TB Solution heat treated and naturally aged to a substantially stable condition
- TB7 Solution heat treated and stabilised
- TE Artificially aged
- TF Solution heat treated and artificially aged
- TF7 Solution heat treated, artificially aged and stabilised
The following alloys may be heat treated, but their properties are not standardised in the heat treated condition shown: LM12, LM21, LM27-TF & LM30-TF.
The following alloys are standardised in the heat treated conditions indicated: LM4-TF, LM9-TE, LM9-TF, LM13-TE, LM 13-TF, LM13- TF7, LM16-TB, LM16-TF, LM22-TB, LM25-TE, LM25-TB7, LM25-TF, LM26-TE, LM28-TE, LM28-TF, LM29-TE, LM29-TF, LM30-TS.
LM31 is a naturally ageing material, which may also be artificially aged.
Heat Treatment of Zinc Alloys
Zinc alloys are not generally heat-treated, but annealing of ZA27 alloy considerably improves ductility.
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- to convert a machined from solid part to a casting
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New at MRT
Visit us at stand C195 at the Farnborough Internaltional Exhibition & Conference Centre on 5th, 6th & 7th February 2019.Read More
31st May 2018
Around 6 months ago, we took a hard look at how we use the data we have available to us at MRT Castings. We looked at everything from data being used by machines, data being created by machines all the way through to where data is being left on the cutting room floor and where data can potentially be corrupted or lost through human error.Read More
2nd Jan 2018
MRT Castings is excited to announce that we will be supporting the 2018 Year of Engineering initiative. The Year of Engineering is a year-long government campaign to support the engineering profession in recruiting the next generation of engineers.Read More