EP0365174B1 - Matériaux composites intermétalliques TiAl-Ti3Al - Google Patents

Matériaux composites intermétalliques TiAl-Ti3Al Download PDF

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Publication number
EP0365174B1
EP0365174B1 EP19890310088 EP89310088A EP0365174B1 EP 0365174 B1 EP0365174 B1 EP 0365174B1 EP 19890310088 EP19890310088 EP 19890310088 EP 89310088 A EP89310088 A EP 89310088A EP 0365174 B1 EP0365174 B1 EP 0365174B1
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EP
European Patent Office
Prior art keywords
ti3al
intermetallic compound
tial
composite material
alloy
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
EP19890310088
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German (de)
English (en)
Other versions
EP0365174A1 (fr
Inventor
Susumu No. 508 Of Lions-Mansion Isobe
Tomohito No. S-302 Of Espoir Atsuta Iikubo
Toshiharu Noda
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.)
Daido Steel Co Ltd
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Daido Steel Co Ltd
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Publication date
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Classifications

    • 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

  • This invention Relates to a TiAl -Ti3Al composite material for use as a raw material of parts required to have excellent heat resistance and toughness, for example, parts to move rotationally such as a gas turbine, a turbine blade of a jet engine and a turbocharger rotor, and parts to move reciprocally such as an engine valve, a piston and a valve rocker arm.
  • Ni based heat-resisting alloys have been used for the turbine blade, the rotor and so on, heat-resisting steels have been used for the engine valve, casting aluminum alloys have been used for the piston, and cast irons have been often used for the valve rocker arm.
  • titanium and titanium alloys are used as lightweight materials superior in strength in the field of aircraft industry Furthermore, TiAl -intermetallic compound based materials have attracted attention as lightweight materials having improved heat resistance.
  • Said TiAl -intermetallic compound based materials are light and excellent in heat resistance, however they do not get to the stage of practical application even now because of the poor toughness (ductility) at room temperature.
  • US-A-3,203,794 discloses binary Ti-(34-46%) Al alloys which exhibit a single phase, face-centred, tetragonal microstructure.
  • Ti-Al alloy having duplex phase structure is disclosed and it is described that the main phase is ⁇ -phase (TiAl) and globular ⁇ 2-phase (Ti3Al) is contained a little in said ⁇ -phase.
  • the present invention is made in view of the above mentioned problem of the prior art, it is an aim to provide TiAl -Ti3Al composite material having improved ductility at room temperature which has the excellent light weight and heat-resisting characteristics of TiAl -intermetallic compound, furthermore by using Ti3Al intermetallic compound.
  • the inventors have found out that the ductility is improved remarkably (the elongation of alloy at room temperature gets to 1.5% or more) in an alloy containing Ti3Al -intermetallic compound in a specified range in TiAl - intermetallic compound. This was determined by investigating the amount of Ti3Al -intermetallic compound and the strength in detail by X-ray diffraction and the tensile testing of ingots melted so as to contain aluminum in the range of 33.2 to 34.9% wt% in titanium.
  • the TiAl -Ti3Al composite material according to this invention has the construction that Al is contained in the range of 33.2 to 34.9% by weight percentage, the balance being Ti and unavoidable impurities, and wherein the TiAl-intermetallic compound contains 11.7 to 31% of fine lamellar Ti3Al-intermetallic compound by volume percentage.
  • the TiAl - Ti3Al composite material according to one of the preferred aspects of this invention has the construction that Al is contained from 33.2% to less than 34% by weight percentage, the balance being Ti and unavoidable impurities and wherein the TiAl-intermetallic compound contains from 15 to 31% of fine lamellar Ti3Al-intermetallic compound by volume percentage. It is characterized by adopting such a construction of TiAl -Ti3Al composite material as a means for solving the aforementioned problem.
  • TiAl -Ti3Al composite material In the TiAl -Ti3Al composite material according to this invention, Al is contained in the range of 33.2 to 34.9% by weight percentage, the balance is Ti and unavoidable impurities, and the TiAl-intermetallic compound contains 11.7 to 31% of fine lamellar Ti3Al -intermetallic compound by volume percentage. Tensile ductility of TiAl -intermetallic compound is at its highest when Ti3Al -intermetallic compound is contained in the range of 11.7 to 31%, preferably 15 to 31%, by volume percentage in TiAl -intermetallic compound at a state in which Ti3 Al-intermetallic compound is distributed finely in lamellar form.
  • Al content is defined in the range of 33.2 to 34.9% by weight percentage so that Ti3Al-intermetallic compound in the range of 11.7 to 31% by volume percentage in order to obtain excellent tensile ductility.
  • Said Ti3Al-intermetallic compound in TiAl -inter metallic compound is variable by not only the composition but also by heat treatment at the time of manufacturing. Namely, if TiAl -intermetallic compound solidified in a non-equilibrium state at the time of manufacturing is maintained at high temperature (more than 1100°C) for a long time, Ti3Al -intermatallic compound dissolves in TiAl -intermetallic compound, the amount of Ti3Al-intermetallic compound decreases, and Ti3Al-intermetallic compound coheres and becomes gross, so that the deterioration of ductility is induced. Accordingly, it is undesirable to perform the heat treatment for a long time at high tempetature in excess of 1100°C. In the case of a heat treatment at 1150°C, for example, it has been found that it is desirable not to exceed 8 hours or so.
  • the TiAl -Ti3Al composite material according to this invention contains 33.2 to 34.9% of Al by weight percentage and the balance is Ti and unavoidable impurities, wherein the TiAl-intermetallic compound contains 11.7 to 31% of Ti3Al-intermetallic compound by volume percentage, so Ti3Al-intermetallic compound is dispersed in proper quantity in TiAl -intermetallic compound. Consequently, said Ti3Al -intermetallic compound dispersed in proper quantity in TiAl -intermetallic compound produces a remarkable improvement in toughness (especially ductility) of TiAl-intermetallic compound which is lightweight and excellent in heat resistance.
  • Ti-Al alloys having chemical composition shown in Table 1 as Nos.1 to 10 were melted in an atmosphere of Ar using a plasma skull crucible furnace, and then cast into ingots of approximately 5 kg in weight.
  • comparative alloy No.6 short of Al content, which is less than 33.2% by weight percentage, is remarkably inferior in the ductility due to Ti3Al -intermetallic compound being in excess.
  • comparative alloy No.8 containing more Al than that of alloy No.7 has inferior mechanical strength and ductility because Ti3Al -intermetallic compound content is lower.
  • the TiAl -Ti3Al composite material according to this invention contains 33.2 to 34.9% of Al by weight percentage and the balance is Ti and unavoidable impurities, wherein the TiAl-intermetallic compound contains 11.7 to 31% of Ti3Al - intermetallic compound by volume percentage. Therefore, it is lightweight and excellent in heat resistance, more over excellent in mechanical strength and elongation. And it is a composite material suitable for a raw material of rotational parts required to have heat resistance and toughness such as a turbine blade and a turbocharger rotor. An excellent effect is obtained in that it results in a weight reduction.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Claims (4)

  1. Un matériau composite à base de TiAl-Ti₃Al comprenant de 33,2 à 34,9 en poids d'Al et un complément de Ti et d'impuretés inévitables, dans lequel le composé intermétallique Ti₃Al est compris dans l'intervalle de 11,7 à 31 % en volume sous la forme de phase lamellaire fine dans du composé intermétallique TiAl.
  2. Un matériau composite à base de TiAl-Ti₃Al selon la revendication 1, dans lequel ledit matériau composite contient de 33,2 à moins de 34 % en poids d'Al.
  3. Un matériau composite à base de TiAl-Ti₃Al selon la revendication 1, dans lequel ledit composite contient 33,5 % en poids d'Al.
  4. Un matériau composite à base de TiAl-Ti₃Al selon l'une quelconque des revendications précédentes dans lequel ledit composé intermétallique Ti₃Al est compris dans l'intervalle de 15 à 31 % en volume sous la forme de phase lamellaire fine dans du composé intermétallique TiAl.
EP19890310088 1988-10-05 1989-10-03 Matériaux composites intermétalliques TiAl-Ti3Al Expired - Lifetime EP0365174B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63251169A JP2960068B2 (ja) 1988-10-05 1988-10-05 ＴｉＡｌ−Ｔｉ▲下３▼Ａｌ系複合材料
JP251169/88 1988-10-05

Publications (2)

Publication Number Publication Date
EP0365174A1 EP0365174A1 (fr) 1990-04-25
EP0365174B1 true EP0365174B1 (fr) 1995-03-01

Family

ID=17218705

Family Applications (1)

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EP19890310088 Expired - Lifetime EP0365174B1 (fr) 1988-10-05 1989-10-03 Matériaux composites intermétalliques TiAl-Ti3Al

Country Status (3)

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EP (1) EP0365174B1 (fr)
JP (1) JP2960068B2 (fr)
DE (1) DE68921410T2 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2546551B2 (ja) * 1991-01-31 1996-10-23 新日本製鐵株式会社 γ及びβ二相ＴｉＡｌ基金属間化合物合金及びその製造方法
US5370839A (en) * 1991-07-05 1994-12-06 Nippon Steel Corporation Tial-based intermetallic compound alloys having superplasticity
DE4215017C2 (de) * 1992-05-12 2000-01-13 Forschungszentrum Juelich Gmbh Verfahren zur Herstellung einer Komponente auf der Basis intermetallischer Phasen des Systems Titan-Aluminium
JP3839493B2 (ja) * 1992-11-09 2006-11-01 日本発条株式会社 Ｔｉ−Ａｌ系金属間化合物からなる部材の製造方法
US5768679A (en) * 1992-11-09 1998-06-16 Nhk Spring R & D Center Inc. Article made of a Ti-Al intermetallic compound
US6425964B1 (en) 1998-02-02 2002-07-30 Chrysalis Technologies Incorporated Creep resistant titanium aluminide alloys
US6143241A (en) 1999-02-09 2000-11-07 Chrysalis Technologies, Incorporated Method of manufacturing metallic products such as sheet by cold working and flash annealing
CN102732748B (zh) * 2012-07-27 2013-10-16 哈尔滨工业大学 一种球形Ti3Al/TiAl双相合金的制备方法
CN112620488A (zh) * 2020-12-16 2021-04-09 西部超导材料科技股份有限公司 一种Ti3Al层状复合板及其制备方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203794A (en) * 1957-04-15 1965-08-31 Crucible Steel Co America Titanium-high aluminum alloys
DE1061522B (de) * 1957-05-31 1959-07-16 Metallgesellschaft Ag Verwendung einer Titanlegierung zur Herstellung von Gegenstaenden, fuer die gute Warmverformbarkeit erforderlich ist
US4294615A (en) * 1979-07-25 1981-10-13 United Technologies Corporation Titanium alloys of the TiAl type
JPS6141740A (ja) * 1984-08-02 1986-02-28 Natl Res Inst For Metals 金属間化合物ＴｉＡｌ基耐熱合金
JPS62256902A (ja) * 1986-04-30 1987-11-09 Nippon Steel Corp 金属間化合物ＡｌＴｉ粉末およびその製造法
JPS63125634A (ja) * 1986-11-12 1988-05-28 Kawasaki Heavy Ind Ltd 溶製材用Ｔｉ―Ａｌ系耐熱合金

Also Published As

Publication number Publication date
EP0365174A1 (fr) 1990-04-25
DE68921410T2 (de) 1995-08-10
JP2960068B2 (ja) 1999-10-06
DE68921410D1 (de) 1995-04-06
JPH02101133A (ja) 1990-04-12

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