JP2829372B2 - Polycrystalline high ductility TiAl-based intermetallic compound - Google Patents
Polycrystalline high ductility TiAl-based intermetallic compoundInfo
- Publication number
- JP2829372B2 JP2829372B2 JP3242306A JP24230691A JP2829372B2 JP 2829372 B2 JP2829372 B2 JP 2829372B2 JP 3242306 A JP3242306 A JP 3242306A JP 24230691 A JP24230691 A JP 24230691A JP 2829372 B2 JP2829372 B2 JP 2829372B2
- Authority
- JP
- Japan
- Prior art keywords
- tial
- intermetallic compound
- based intermetallic
- ductility
- crystal
- 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
Links
- 229910010038 TiAl Inorganic materials 0.000 title claims description 13
- 229910000765 intermetallic Inorganic materials 0.000 title claims description 11
- 239000013078 crystal Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000004857 zone melting Methods 0.000 description 2
- 239000011825 aerospace material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000010275 isothermal forging Methods 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Landscapes
- Crystals, And After-Treatments Of Crystals (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、高延性ＴｉＡｌ基金
属化合物の多結晶体に関するものである。さらに詳しく
は、この発明は、引張強度とともに延性に優れ、航空宇
宙材料、その他の軽量高比強度構造材料等として有用
な、製造容易な高延性ＴｉＡｌ基金属間化合物多結晶体
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polycrystal of a highly ductile TiAl-based metal compound. More particularly, the present invention relates to a highly ductile TiAl-based intermetallic compound polycrystal which is excellent in ductility as well as tensile strength and is useful as an aerospace material, other lightweight high specific strength structural materials, and the like.
【０００２】[0002]
【従来の技術とその課題】従来より、軽量高比強度な新
しい構造用材料として高延性ＴｉＡｌ系金属間化合物が
注目されており、その特性の向上と、応用の拡大につい
ての検討が精力的に進められてきている。特に、このＴ
ｉＡｌ系金属間化合物は、低比重（３．８ｇ／ｃｍ3 ）
であり、比強度が大きく耐酸化性に優れ、さらには高剛
性でもあることから、航空宇宙の飛翔体用構造材料とし
ての実用化が期待されているものでもある。このように
期待の大きな材料ではあるが、従来の金属間化合物とし
てのＴｉＡｌ基化合物の場合には常温での延性が乏しい
ために実用化への道のりはいまだ遠いのが実情であっ
た。2. Description of the Related Art Conventionally, highly ductile TiAl-based intermetallic compounds have attracted attention as a new lightweight structural material having a high specific strength, and efforts have been made to improve their properties and expand their applications. It is being advanced. In particular, this T
The iAl intermetallic compound has a low specific gravity (3.8 g / cm 3 ).
Because of its high specific strength, excellent oxidation resistance, and high rigidity, it is expected to be put to practical use as a structural material for aerospace flying objects. Although it is a material of great expectation as described above, in the case of a conventional TiAl-based compound as an intermetallic compound, the ductility at room temperature is poor, so that it is still far from practical use.
【０００３】実際、実用化のためには、室温での常温延
性が少なくとも３％は必要であると考えられているが、
ＴｉＡｌの２元素ではせいぜい２％程度にとどまり、第
３成分元素をさらに加えたものでも、最高３％程度にし
かすぎず、常温延性が４％を超えるものはいまだ実現さ
れていなかった。第３成分元素の添加とともに、恒温鍛
造や押し出し、引き抜きなどの加工熱処理による組織の
微細化による延性改善も試みられているが、大変に面倒
な操作が必要であって、しかも延性は４％を超えること
はなった。In practice, it is considered that at least 3% of room-temperature ductility at room temperature is required for practical use.
The two elements of TiAl are only about 2% at most, and those further added with the third component are only about 3% at the maximum, and those having room-temperature ductility exceeding 4% have not yet been realized. Along with the addition of the third component element, attempts have been made to improve ductility by making the structure finer by working heat treatment such as isothermal forging, extrusion, and drawing. However, a very troublesome operation is required, and the ductility is reduced by 4%. It was not exceeded.
【０００４】一方、これらの組織制御の検討から、化学
量論組成のＴｉ−５０％ＡｌからわずかにＴｉ−リッチ
側に属するＴｉ3 Ａｌ／ＴｉＡｌの２相層状組織を有す
る単結晶様結晶体は、常温で１０％以上の伸びを示すこ
とが見出されている。しかしながら、この場合には、そ
の機械的性質は応力軸に対するＴｉ3 Ａｌ／ＴｉＡｌ２
相の層状構造の方位に強く依存し、延性の大きな方向で
は逆に引張り強度が著しく弱いという欠点があった。し
かもこの単結晶様組織は、製造が容易でないなどの欠点
もあった。[0004] On the other hand, from the examination of the microstructure control, a single crystal-like crystal having a two-phase layered structure of Ti 3 Al / TiAl belonging to the Ti-rich side slightly from the stoichiometric composition of Ti-50% Al is obtained. It has been found to exhibit an elongation of 10% or more at room temperature. However, in this case, the mechanical properties are Ti 3 Al / TiAl 2 with respect to the stress axis.
There is a drawback that the tensile strength strongly depends on the orientation of the layered structure of the phase and is extremely low in the direction of large ductility. In addition, this single crystal-like structure has disadvantages such as difficulty in production.
【０００５】このため、強度の低下をともなうことな
く、優れた強度と延性を両立させ、しかも製造が容易に
可能な、ＴｉＡｌ基金属間化合物の実現が強く望まれて
いた。この発明は、以上の通りの事情に鑑みてなされた
ものであり、従来材料の欠点を解消し、強度とともに延
性に優れ、しかも製造容易な新しい高延性ＴｉＡｌ基金
属間化合物を提供することを目的としている。[0005] Therefore, it has been strongly desired to realize a TiAl-based intermetallic compound that can achieve both excellent strength and ductility without lowering the strength and that can be easily manufactured. The present invention has been made in view of the circumstances described above, and has as its object to provide a new highly ductile TiAl-based intermetallic compound which solves the drawbacks of conventional materials, has excellent strength and ductility, and is easy to manufacture. And
【０００６】[0006]
【課題を解決するための手段】この発明は、上記の課題
を解決するものとして、ＴｉＡｌ−γおよびＴｉ3 Ａｌ
−α2 の２相層状組織、もしくはＴｉＡｌ−γの単相組
織を有し、Ｔｉ−４５〜５４％（原子）Ａｌの組成から
なり、結晶粒形態が結晶成長方向に沿って長く伸び結晶
粒の長手方向と幅との長さの比（アスペクト比）が１０
以上である柱状晶組織を形成していることを特徴とする
高延性ＴｉＡｌ基金属間化合物の多結晶体を提供する。SUMMARY OF THE INVENTION According to the present invention, TiAl-γ and Ti 3 Al
2-phase lamellar structure of-.alpha. 2, or have a single phase structure of TiAl-gamma, consist composition of Ti-45-54% (atomic) Al, grain form crystal grains elongated along the crystal growth direction The length ratio (aspect ratio) of the longitudinal direction to the width is 10
A polycrystalline body of a highly ductile TiAl-based intermetallic compound, characterized by forming the columnar crystal structure described above.
【０００７】また、常温延性が４％以上としてなること
をその一つの態様としている。そして、このようなこの
発明の多結晶体は、いわゆる浮遊帯域溶融法（ＦＺ法）
等の適宜な手段での一方向性凝固により容易に製造する
ことができる。なお、この発明の多結晶体では、前記の
通り、Ｔｉに対して４５〜５４原子％のＡｌを構成要件
としているが、所要の強度と、延性を有する多結晶体で
あることを必須としている。もちろん、この組成比の上
限、下限は、いわゆる臨界的なものとして考えることは
必要ではない。概略の制限として理解されるべきであ
る。Another aspect is that the room temperature ductility becomes 4% or more. The polycrystalline material of the present invention is formed by a so-called floating zone melting method (FZ method).
It can be easily manufactured by one-way solidification by an appropriate means such as. In addition, in the polycrystal of the present invention, as described above, 45 to 54 atomic% of Al with respect to Ti is a constituent requirement, but it is essential that the polycrystal has a required strength and ductility. . Of course, it is not necessary to consider the upper and lower limits of the composition ratio as so-called critical ones. It should be understood as a general restriction.
【０００８】そこで、以下、実施例を示し、さらに詳し
くこの発明の多結晶について説明する。[0008] Then, an example is shown below, and the polycrystal of the present invention will be described in more detail.
【０００９】[0009]
【実施例】光学式浮遊帯域溶融装置を用いて、 （ａ） Ｔｉ−４８原子％Ａｌ （ｂ） Ｔｉ−５０原子％Ａｌ （ｃ） Ｔｉ−５２原子％Ａｌ の組成からなる３種の合金について、５ｍｍ／ｈ、２４
ｍｍ／ｈおよび７０ｍｍ／ｈの速度で一方向凝固結晶棒
を作製し、その組織および引張特性について評価した。
その結果、以下の通りの結果となった。DESCRIPTION OF THE PREFERRED EMBODIMENTS Three types of alloys having the composition of (a) Ti-48 atomic% Al (b) Ti-50 atomic% Al (c) Ti-52 atomic% Al using an optical floating zone melting apparatus. , 5mm / h, 24
Unidirectionally solidified crystal rods were produced at speeds of mm / h and 70 mm / h, and their texture and tensile properties were evaluated.
As a result, the following results were obtained.
【００１０】結晶組織について ・成長速度５ｍｍ／ｈの場合； 前記（ａ）（ｂ）の組成の場合には、図１および図２に
も示したように、ＴｉＡｌ−γおよびＴｉ3 Ａｌ−α2
の２相からなる層状の単結晶様組織となり、多結晶体は
得られない。 Regarding the crystal structure: When the growth rate is 5 mm / h; In the case of the compositions (a) and (b), as shown in FIGS. 1 and 2, TiAl-γ and Ti 3 Al-α Two
And a polycrystalline body cannot be obtained.
【００１１】一方、前記（ｃ）の組成の場合には、単結
晶様組織とはならず、ＴｉＡｌ−γ単相の多結晶体とな
った。 ・成長速度２４ｍｍ／ｈの場合 （ａ）（ｂ）（ｃ）のいずれの場合も多結晶体となる。
そして、（ａ）（ｂ）の結晶粒は、若干成長方向に伸び
た形状を示し（アスペクト比約２）、（ａ）組成におい
ては、ＴｉＡｌ−γ／Ｔｉ3 Ａｌ−α2 の層状組織を有
し、その方向は、成長方向に対して粒毎に相違してい
る。（ｂ）組成は、ほぼ同様の組織を有しているが、Ｔ
ｉＡｌ−γ単相粒も存在している。On the other hand, in the case of the composition (c), a single crystal-like structure was not obtained, and a TiAl-γ single phase polycrystal was obtained. -In the case of a growth rate of 24 mm / h In any of (a), (b) and (c), a polycrystal is obtained.
The crystal grains of (a) and (b) show shapes slightly extending in the growth direction (aspect ratio of about 2), and in the composition of (a), the layered structure of TiAl-γ / Ti 3 Al-α 2 has And the direction is different for each grain with respect to the growth direction. (B) Although the composition has almost the same structure,
There are also iAl-γ single phase grains.
【００１２】一方、（ｃ）の場合には、γ単相であり、
（ｂ）（ｃ）に比べてかなり柱状結晶の様相を示してい
る。 ・成長速度７０ｍｍ／ｈの場合 （ａ）組成のものは、結晶粒のアスペクト比が成長方向
に沿って２０以上の柱状粒からなる多結晶体となり、各
々の結晶粒は、γ／α2 ２相の層状組織を有している。
また、層状方向は粒毎に相違している。On the other hand, in the case of (c), it is a γ single phase,
(B) Compared with (c), the appearance of columnar crystal is considerably shown. · If the growth rate 70mm / h (a) those of the composition, the aspect ratio of the crystal grains becomes polycrystal consisting of 20 or more columnar grains along the growth direction, each of the crystal grains, gamma / alpha 2 2 It has a layered structure of phases.
Further, the laminar direction is different for each grain.
【００１３】（ｂ）組成のものもほぼ同様であるが、層
状粒とγ単相粒が混在した多結晶体となっている。延性および強度について 以上の各種の組織を有する試料について、インストロン
型試験器にて引張試験を行い、延性および強度について
評価した。(B) The composition is almost the same, but it is a polycrystal in which layered grains and γ single phase grains are mixed. About the sample which has the above various structures about ductility and intensity | strength, the tensile test was performed with the Instron type tester, and ductility and intensity | strength were evaluated.
【００１４】図３に示したように、前記（ａ）の組成に
ついて、７０ｍｍ／ｈの速度で成長させて得た、柱状粒
を有し、かつ、ＴｉＡｌ−γ／Ｔｉ3 Ａｌ−α2 ２相の
層状構造を有する金属間化合物多結晶体の場合には、常
温引張り伸びは、４．３％以上にもなった。また、引張
り強度も良好であった。また、（ｃ）組成についても、
延性の向上が確認された。[0014] As shown in FIG. 3, the composition of the (a), obtained by growing at a rate of 70 mm / h, has a columnar grain, and, TiAl-γ / Ti 3 Al -α 2 2 In the case of the intermetallic compound polycrystal having the layer structure of the phase, the room temperature tensile elongation was 4.3% or more. Also, the tensile strength was good. Also, regarding the composition (c),
Improvement of ductility was confirmed.
【００１５】[0015]
【発明の効果】この発明により、以上詳しく説明した通
り、強度とともに常温延性にも優れ、しかも製造容易な
ＴｉＡｌ基金属間化合物が実現される。According to the present invention, as described in detail above, a TiAl-based intermetallic compound having excellent strength and room-temperature ductility and easy to produce is realized.
【図１】合金組成と成長速度とを変化させて得られた結
晶組織の図面に代わる光学顕微鏡写真である。FIG. 1 is an optical microscope photograph replacing a drawing of a crystal structure obtained by changing an alloy composition and a growth rate.
【図２】アルミニウム含有量と成長速度とを変化させて
得られた結晶の結晶組織の分類図である。FIG. 2 is a classification diagram of a crystal structure of a crystal obtained by changing an aluminum content and a growth rate.
【図３】アルミニウム含有量と成長速度とを変化させて
得られた延性と強度の特性図である。FIG. 3 is a characteristic diagram of ductility and strength obtained by changing an aluminum content and a growth rate.
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) C22C 21/00 C22C 1/00 C22C 1/02 501 C22C 14/00Continuation of the front page (58) Field surveyed (Int. Cl. 6 , DB name) C22C 21/00 C22C 1/00 C22C 1/02 501 C22C 14/00
Claims (2)
２相層状組織、もしくはＴｉＡｌ−γの単相組織を有
し、Ｔｉ−４５〜５４原子％Ａｌの組成からなり、結晶
粒形態が結晶成長方向に沿って長く伸び結晶粒の長手方
向と幅との長さの比（アスペクト比）が１０以上である
柱状晶組織を形成し、常温延性が４％以上であることを
特徴とする高延性ＴｉＡｌ基金属間化合物の多結晶体。1. A has a TiAl-gamma and Ti 3 Al-alpha 2 of the two-phase lamellar structure, or a single phase structure of TiAl-gamma, consist composition of Ti-45-54 atomic% Al, grain morphology It forms a columnar crystal structure that has a length-to-length ratio (aspect ratio) of 10 or more, which extends long along the crystal growth direction, and has a room-temperature ductility of 4% or more. Highly ductile polycrystalline TiAl-based intermetallic compound.
１の多結晶体。2. The polycrystal according to claim 1, produced by unidirectional solidification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3242306A JP2829372B2 (en) | 1991-08-29 | 1991-08-29 | Polycrystalline high ductility TiAl-based intermetallic compound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3242306A JP2829372B2 (en) | 1991-08-29 | 1991-08-29 | Polycrystalline high ductility TiAl-based intermetallic compound |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0711369A JPH0711369A (en) | 1995-01-13 |
| JP2829372B2 true JP2829372B2 (en) | 1998-11-25 |
Family
ID=17087265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3242306A Expired - Lifetime JP2829372B2 (en) | 1991-08-29 | 1991-08-29 | Polycrystalline high ductility TiAl-based intermetallic compound |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2829372B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101342169B1 (en) * | 2013-05-20 | 2013-12-18 | 한국기계연구원 | A tial base alloy ingot having ductility at room temperature |
| CN107937753B (en) * | 2017-11-27 | 2019-06-25 | 长春工业大学 | A kind of TiAl duplex grain structure alloy and preparation method with bimodal character |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01287243A (en) * | 1988-05-13 | 1989-11-17 | Nippon Steel Corp | Ti-al intermetallic compound containing mn and nb and its manufacture |
| JPH02277736A (en) * | 1989-04-19 | 1990-11-14 | Mitsubishi Heavy Ind Ltd | Ti-al base heat-resistant alloy |
-
1991
- 1991-08-29 JP JP3242306A patent/JP2829372B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| 「日本金属学会１９９１年春期大会講演概要」（１９９１．４） ｐ．１８８ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0711369A (en) | 1995-01-13 |
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