Claims
- 1. A cast magnesium base alloy which when heat treated has a 0.2% proof stress of at least 175 N/mm.sup.2 and an ultimate tensile strength of at least 240 N/mm.sup.2 at ambient room temperature, consisting of the following other than iron and other impurities:
- ______________________________________Magnesium at least 88%Silver from 1 to 2% by weightCopper from 0.05 to 0.15% by weightRare Earth Metals ofwhich at least 60% byweight are Neodymium from 0.5 to 3.0% by weightZirconium nil to 1% by weightManganese nil to 2% by weightZinc nil to 0.5% by weightCadmium nil to 1.0% by weightLithium nil to 6.0% by weightCalcium nil to 0.8% by weightGallium nil to 2.0% by weightIndium nil to 2.0% by weightThallium nil to 5.0% by weightLead nil to 1.0% by weightBismuth nil to 1.0% by weight______________________________________
- the maximum quantities of zirconium and manganese being limited by their mutual solubility in the alloy.
- 2. An alloy according to claim 1, containing from 1.0 to 1.75% by weight of silver.
- 3. An alloy according to claim 1 which contains at least 0.4% by weight of zirconium.
- 4. An alloy according to claim 1, in which the neodymium is added as a mixture of rare earth metals containing at least 60% by weight of neodymium and not more than 25% by weight of lanthanum and cerium taken together.
- 5. An alloy according to claim 1, containing up to 0.1% copper.
- 6. A cast magnesium base alloy product according to claim 1, obtained by holding the cast alloy at a temperature from 400.degree. C. to 485.degree. C. for at least one hour followed by holding at a temperature form 485.degree. C. to the solidus of the alloy for at least 2 hours, then quenching and ageing the product at a temperature from 100.degree. to 275.degree. C. for at least half an hour.
- 7. A cast magnesium base alloy product according to claim 5, obtained by holding the cast alloy at a temperature from 485.degree. C. to the solidus of the alloy for at least 2 hours and then quenching and ageing the product at a temperature from 100.degree. C. to 275.degree. C. for at least half an hour.
Priority Claims (1)
Number |
Date |
Country |
Kind |
56021/74 |
Dec 1974 |
GBX |
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Parent Case Info
This application is a continuation-in-part of patent application Ser. No. 645,225 filed Dec. 29, 1977, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3039868 |
Payne et al. |
Jun 1962 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
645225 |
Dec 1977 |
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