US3416978A - Magnesium base alloys - Google Patents

Magnesium base alloys Download PDF

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Publication number
US3416978A
US3416978A US714359A US71435968A US3416978A US 3416978 A US3416978 A US 3416978A US 714359 A US714359 A US 714359A US 71435968 A US71435968 A US 71435968A US 3416978 A US3416978 A US 3416978A
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US
United States
Prior art keywords
percent
zirconium
alloy
zinc
alloys
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US714359A
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English (en)
Inventor
Emley Edward Frederick
Meredith Peter Clive
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Magnesium Elektron Ltd
Original Assignee
Magnesium Elektron Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Magnesium Elektron Ltd filed Critical Magnesium Elektron Ltd
Application granted granted Critical
Publication of US3416978A publication Critical patent/US3416978A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C24/00—Alloys based on an alkali or an alkaline earth metal
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C25/00—Alloys based on beryllium

Definitions

  • This invention relates to magnesium base alloys'and its main object is to produce an alloy which in the fully heat treated cast state has a combination of mechanical strength properties hitherto unobtained and in particular a 0.1% proof stress of over 12.5 tons per square inch on test bars made according to British standard specification No. L101 combined with adequate maximum tensile stress (e.g. at least 17 tons per square inch) and adequate elongation (e.g. at least 3 percent elongation).
  • MSR high strength magnesium alloy
  • Another high strength magnesium alloy (known as MSR) described in the specification of British Patent No. 875,929 consists of zirconium up to 1.0%, 0.5 to 3.5 rare earth metals and from 1.5 to 3.5 percent silver, with less than 0.5 percent zinc if any. More than 0.5% zinc in this MSR alloy spoils the properties of the alloy. This alloy can achieve a 0.1% proof stress of 12.0 tons with an ultimate tensile stress of 16.0 tons and 3% elongation.
  • Percent Zinc (preferably 3-7) 3 to 8 Silver (preferably 1.54.0%) 1 to 4.0 Zirconium 0.4 to 1.0 Thorium 0 to less than 0.5 Rare earth metals 0 to less than 0.5 Thorium and rare earth metals together less than 0.5 Manganese 0 to 0.15 Cadmium 0 to 1.0 Calcium 0 to 0.8 Indium 0 to 2.0
  • heat treatment may be carried out by first effecting solution heat treatment at 450 to 490 C. for at least two hours, followed by precipitation heat treatment at a temperature of to 180 C. for a period of at least 5 hours (preferably 10 to 30 hours).
  • solution heat treatment temperature can be as high as 520 C.
  • the alloy After effecting solution heat treatment the alloy should be rapidly cooled. It is found that the aforesaid MSR alloy if cooled with an air blast at this stage suffers loss of mechanical properties and must therefore be quenched in liquid which is less convenient. However, the alloy of the present invention can be cooled by an air blast at this stage and still develops good mechanical properties.
  • ASTM type test bars solution heat treated 16 hrs. at 460 C., air blast cooled, and aged for 72 hrs. at 125 C.
  • the increased soundness obtainable with the reduced zirconium content enables higher zinc contents to be effectively utilised than are preferable when the alloys are saturated with zirconium.
  • the useful range of zinc content is then extended, e.g. to about 8%.
  • the preferred silver content may then be reduced, e.g. to about 1%. Solution heat treatment temperatures will generally be slightly lower for alloys with reduced zirconium content.
  • Mg-Zn-Ag-Zr alloys with a controlled lower zirconium content
  • one convenient procedure is to melt down metal charges consisting of pre-alloyed ingot (containing e.g. 0.l-0.3% Zr) and Mg-Zn-Ag-Zr alloy scrap, and to revivify each melt with a 3% addition of Mg -30% Zr hardener alloy. For full saturation with zirconium, a 5% addition of such hardener would normally be used.
  • the alloys of the present invention may be used for cast parts requiring high strength such as aircraft frame parts but may also be used in wrought forms.
  • the magnesium content of the alloy should be at least percent preferably at least percent.
  • the alloy of the kind containing this reduced quantity of soluble zirconium will usually contain up to 8 percent zinc (e.g. 5 to 8 percent) together with 0.4 to 0.7 (preferably 0.5 to 0.7 percent zirconium.
  • the soluble zirconium is soluble in dilute hydrochloric acid as distinct from any additional small amount of zirconium which may be present but which is not soluble in dilute hydrochloric acid.
  • the normal soluble zirconium content of alloys at the 58% zinc level is over 0.7, e.g. 0.75 to 0.9 percent.
  • a solution heat treated and precipitation heat treated cast article consisting essentially of 5 to 7% Zinc, 1.5 to 4% silver, 0.4 to 1% zirconium, balance magnesium.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
US714359A 1963-04-03 1968-03-19 Magnesium base alloys Expired - Lifetime US3416978A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB13197/63A GB987515A (en) 1963-04-03 1963-04-03 Improvements in or relating to magnesium base alloys

Publications (1)

Publication Number Publication Date
US3416978A true US3416978A (en) 1968-12-17

Family

ID=10018606

Family Applications (1)

Application Number Title Priority Date Filing Date
US714359A Expired - Lifetime US3416978A (en) 1963-04-03 1968-03-19 Magnesium base alloys

Country Status (5)

Country Link
US (1) US3416978A (fr)
CH (1) CH428237A (fr)
DE (1) DE1246257B (fr)
GB (1) GB987515A (fr)
SE (1) SE303381B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2157201A4 (fr) * 2007-05-09 2014-07-09 Nat Inst For Materials Science ALLIAGE À BASE DE Mg

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO152944C (no) * 1978-05-31 1985-12-18 Magnesium Elektron Ltd Magnesiumlegering med gode mekaniske egenskaper.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB511137A (en) * 1938-02-09 1939-08-09 Ig Farbenindustrie Ag Improvements in and relating to magnesium alloys
US2178580A (en) * 1936-11-23 1939-11-07 Dow Chemical Co Magnesium alloy
US2750288A (en) * 1951-05-09 1956-06-12 Magnesium Elektron Ltd Magnesium base alloys
US3039868A (en) * 1958-05-16 1962-06-19 Magnesium Elektron Ltd Magnesium base alloys

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE932987C (de) * 1940-02-11 1955-09-15 Ig Farbenindustrie Ag Magnesiumlegierungen mit hoher Warmfestigkeit
GB734011A (en) * 1952-04-22 1955-07-20 Magnesium Elektron Ltd Improvements in or relating to magnesium base alloys
GB875929A (en) * 1958-05-16 1961-08-23 Stone & Company Charlton Ltd J Improvements in or relating to magnesium base alloys

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178580A (en) * 1936-11-23 1939-11-07 Dow Chemical Co Magnesium alloy
GB511137A (en) * 1938-02-09 1939-08-09 Ig Farbenindustrie Ag Improvements in and relating to magnesium alloys
US2750288A (en) * 1951-05-09 1956-06-12 Magnesium Elektron Ltd Magnesium base alloys
US3039868A (en) * 1958-05-16 1962-06-19 Magnesium Elektron Ltd Magnesium base alloys

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2157201A4 (fr) * 2007-05-09 2014-07-09 Nat Inst For Materials Science ALLIAGE À BASE DE Mg

Also Published As

Publication number Publication date
SE303381B (fr) 1968-08-26
CH428237A (fr) 1967-01-15
DE1246257B (de) 1967-08-03
GB987515A (en) 1965-03-31

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