US2864698A - Titanium base aluminum-tantalumcolumbium alloys - Google Patents

Titanium base aluminum-tantalumcolumbium alloys Download PDF

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Publication number
US2864698A
US2864698A US592277A US59227756A US2864698A US 2864698 A US2864698 A US 2864698A US 592277 A US592277 A US 592277A US 59227756 A US59227756 A US 59227756A US 2864698 A US2864698 A US 2864698A
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alloys
titanium
aluminum
columbium
tantalum
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Expired - Lifetime
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US592277A
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English (en)
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Abkowitz Stanley
Paul E Moorhead
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RMI Co
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RMI Co
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Priority to US592277A priority Critical patent/US2864698A/en
Priority to DEM34474A priority patent/DE1135670B/de
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium

Definitions

  • the invention relates to titanium base alloys and more particularly to quaternary titanium base alloys containing aluminum, tantalum and columbium. More particularly the invention relates to a titanium sheet alloy which is Weldable and has a minimum yield strength as annealed of 110,000 p. s. i. with satisfactory ductility.
  • Certain prior'aluminum-Vanadium-titanium alloys have favorable high temperature properties and can be fabricated readily but they are not readily Weldable particularly in sheet material. Certain prior aluminum-tintitanium alloys are Weldable and may be formed but are ditlicult to manufacture in sheet form and they do not have the room temperature and high temperature strength below 1000 F. of the aluminum-vanadium-titanium alloys.
  • alloys of the present invention have a 10,000 p. s. i. better room temperature yield strength, with this advantage stillmaintained at 1000 F., than prior aluminum-tin-titaniurn alloys. That is to say, alloys of the present invention have a 120,000 p. s. i. minimum yield strength at room temperature and a 67,000 p. s. i. minimum yield strength at 1000 F. with comparable bend and tensile ductility and better impact strength than prior aluminum-tin-titanium alloys.
  • the improved alloys of the present invention have weldability comparable to the prior aluminum-tin alloy.
  • the improved alloys of the present invention can be forged or rolled and sheet material can be manufactured therefrom .with less difficulty than the considerable difficulty heretofore experienced in rolling titanium alloys which are weldable.
  • the alloys of the present invention may be prepared from either commercial titanium or high purity titanium. Where prepared fromcommercial titanium, a typical analysis of the material, in addition to titanium, aluminum, tantalum and columbium, is 0.02% C, 0.01% N 0.10% 0 and 0.005% H However, the invention is not restricted to the use of material having the typical interstitial level indicated, as the level may be of the order of 0.06% C, 0.03% N 0.15% 0 and 0.02% to 0.024% H In other words, presently available sponge having a sponge hardness of 120 BHN is suitable. The sponge hardness may range from BHN to 150 BHN. in examples given below, titanium sponge having a typical interstitial level of BHN was used.
  • the titanium is preferably melted by the electric arc process in a Water-cooled copper crucible in an atmosphere such as argon and the alloy elements are added to the melt either by the addition of aluminum and alloys of tantalum and columbium or by the addition of 'an alloy of aluminum, tantalum and columbium.
  • the alloys of the present invention comprise from 5% to 9% aluminum, and from 1% to 5% a combination of tantalum and columbium.
  • the tantalum and columbium content may be in the ratio of from 2 tantalum to 1 columbium to a ratio of l tantalum to 2 columbium.
  • preferred alloys of the present invention may comprise 7% aluminum, and 5% tantalum and columbium or 8% aluminum and 3% tantalum and columbium, preferably in the range of ratios between 1 to 2 or 2 to 1 tantalum and columbium.
  • the alloys of the present invention after melting and casting may be processed in the usual manner and forged or rolled to form the desired semi-finished or finished product.
  • ingots of the improved quaternary alloys may be forged or bloomed to slab form, hot rolled to sheet bar, and the sheet bar may be rolled to form finished sheets, say, .020 to .090" thick.
  • the bend graph of Figure 3 shows good formability for the material over the entire range and with little change over the entire range of from 1% to 5% combined tantalum and columbium.
  • the addition of 1% or more combined tantalum and columbium substantially improves the ductility of a titanium aluminum alloy, which is a characteristic very much to be desired, as high aluminum titanium alloys in the range, say, of 6% to 8% aluminum normally are embrittled by the aluminum content thereof.
  • the alloys of the present invention are characterized by good formability, good ductility, high strength at room temperature and elevated temperatures, weldability and ease of manufacture.
  • An alloy of aluminum tantalum and columbium has a lower melting point than the melting point of either tantalum or columbium alone. This characteristic facilitates melting and alloying of an aluminum-tantalumcolumbium alloy with titanium and in producing a homogeneous product without segregation of tantalum or columbium in the melt. Such segregation, if present, could. embrittle the material. Further the cost of the aluminum-tantalum-columbium alloy used is substantially less than the cost of an equivalent amount of these elements if used in the pure form.
  • alloys of the present invention have been described particularly as sheet alloys, the use of the same is not limited to the manufacture of sheet material as the desirable properties can be availed of in other kinds of semi-finished or finished titanium alloy products, such as bars.
  • compositions usually are close to the nominal or intended composition but may vary slightly either way from the intended values, depending upon the ability to control the exact amount of alloying additions made. Also where percentages are given, percent by weight is intended.
  • the improved quaternary titanium base aluminum-rantalum-columbium alloys surpass the elevated temperature strength of prior 6 Al-4 V alloys at 1000 F. Further, the strength of the improved alloys of the present invention at room temperature may be increased by the addition of larger amounts of aluminum or of: combined tantalum and columbium while the strength at elevated temperatures may be increased by the addition of greater amounts of aluminum.
  • the alloys of the present invention accordingly provide quaternary titanium alloys which are easier to make than other weldable alloys, which have high temperature properties and ease of fabricability of one known prior titanium alloy, along with the formability and weldability of another known titanium alloy, which combination of properties heretofore was not obtainable in any known titanium alloy.
  • a weld-able titanium base alloy consisting of 5% to 9% aluminum, 33% to 3.33% tantalum, 33% to 3.33%
  • a weldable titanium base alloy consisting of 5% to 9% aluminum, 1% to 5% combined tantalum and columbium in the range of ratios between 1 to 2 and 2 to 1 tantalum and columbium and the balance titanium with incidental impurities.
  • a weldable titanium base alloy consisting of 7% aluminum, 1.7% tantalum, 3.4% columbium, the balance titanium with incidental impurities; and said alloy 10 having as-annealed, a yield strength of 124,400 p. s. i. and elongation of 12.7%.
  • a weldable titanium base alloy consisting of 7% aluminum, 1% tantalum, 2% columbium, the balance titanium with incidental impurities; and said alloy having as-annealed, a yield strength of 110,000 p. s. i. and elongation of 15.7%.
  • a weldable titanium base alloy consisting of 7% aluminum, .3% tantalum, .7% columbium, the balance titanium with incidental impurities; and said alloy having as-annealed, a yield strength of 100,800 p. s. i. and elongation of 18.1%.

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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)
  • Heat Treatment Of Steel (AREA)
US592277A 1956-06-19 1956-06-19 Titanium base aluminum-tantalumcolumbium alloys Expired - Lifetime US2864698A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US592277A US2864698A (en) 1956-06-19 1956-06-19 Titanium base aluminum-tantalumcolumbium alloys
DEM34474A DE1135670B (de) 1956-06-19 1957-06-14 Verwendung von verguetbaren Ti-Al-V-Fe-Legierungen als Werkstoff zur Herstellung von Blechen und anderen Walzwerkserzeugnissen

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US592277A US2864698A (en) 1956-06-19 1956-06-19 Titanium base aluminum-tantalumcolumbium alloys

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3370946A (en) * 1965-09-21 1968-02-27 Reactive Metals Inc Titanium alloy
CN113293325A (zh) * 2021-05-27 2021-08-24 西北有色金属研究院 一种高强Ti185合金的制备方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2754204A (en) * 1954-12-31 1956-07-10 Rem Cru Titanium Inc Titanium base alloys

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1094616A (de) * 1955-05-23

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2754204A (en) * 1954-12-31 1956-07-10 Rem Cru Titanium Inc Titanium base alloys

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3370946A (en) * 1965-09-21 1968-02-27 Reactive Metals Inc Titanium alloy
CN113293325A (zh) * 2021-05-27 2021-08-24 西北有色金属研究院 一种高强Ti185合金的制备方法

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Publication number Publication date
DE1135670B (de) 1962-08-30

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