JPH07238337A - Nb-al intermetallic compound reinforced with sigma-phase - Google Patents
Nb-al intermetallic compound reinforced with sigma-phaseInfo
- Publication number
- JPH07238337A JPH07238337A JP6029359A JP2935994A JPH07238337A JP H07238337 A JPH07238337 A JP H07238337A JP 6029359 A JP6029359 A JP 6029359A JP 2935994 A JP2935994 A JP 2935994A JP H07238337 A JPH07238337 A JP H07238337A
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- Prior art keywords
- phase
- intermetallic compound
- sigma
- atomic
- strength
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、近年耐熱構造材料とし
て研究が進められているＮｂ−Ａｌ系合金に関するもの
であって、タービンエンジンを始めとして、超音速旅客
機の機体などに利用される耐熱材料として応用される。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Nb-Al alloy which has been studied as a heat resistant structural material in recent years, and is used for a heat engine of supersonic passenger aircraft such as a turbine engine. Applied as a material.
【０００２】[0002]
【従来の技術】Ｎｂ−Ａｌ系金属間化合物は、Ｎｂ3 Ａ
ｌ、Ｎｂ2 ＡｌあるいはＮｂＡｌ3 として存在すること
が知られている。しかし、その状態図は十分整備されて
おらず、またその特性も明らかにされていない。最もＮ
ｂ含有量の多い金属間化合物であり、Ａｌ５型結晶構造
を持つＮｂ3 Ａｌは、融点が非常に高いため高温構造用
材料として有望視されている。2. Description of the Related Art Nb-Al intermetallic compounds are Nb 3 A
It is known to exist as 1, Nb 2 Al or NbAl 3 . However, its state diagram is not well developed and its characteristics have not been clarified. Most N
a large intermetallic compound of b content, Nb 3 Al with Al5 type crystal structure, melting point is promising as a very high temperature structural material for high.
【０００３】一方、Ｎｂ3 ＡｌよりＮｂの少ない金属間
化合物であるＮｂ2 Ａｌは、シグマ相と呼ばれる結晶構
造を有している。このシグマ相は、Ａｌ組成がさらに増
加すると出現するが、非常に脆い物質であるため強度特
性に悪影響を与える。すなわち、シグマ相の存在によっ
て材料全体の脆性が増加し、強度が低下してしまうので
ある。従来、Ｎｂ−Ａｌ系金属間化合物に関しては第三
元素の添加やＨＩＰ処理などのプロセスにより特性改善
が試みられてきたが、シグマ相を積極的に利用しようと
した例はいまだない。On the other hand, Nb 2 Al, which is an intermetallic compound containing less Nb than Nb 3 Al, has a crystal structure called a sigma phase. This sigma phase appears when the Al composition further increases, but since it is a very brittle substance, it adversely affects the strength characteristics. That is, the presence of the sigma phase increases the brittleness of the entire material and reduces the strength. Conventionally, with respect to the Nb-Al-based intermetallic compound, characteristic improvement has been attempted by a process such as addition of a third element and HIP treatment, but there are still no examples in which the sigma phase is positively utilized.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、Ｎｂ−Ａｌ
系にＷを添加したＮｂ−Ａｌ−Ｗ三元系の特定の範囲の
金属間化合物中のＡｌ５相にシグマ相を分散させ、高温
での強度特性に優れたＮｂ−Ａｌ系金属間化合物の複合
体を提供することを目的とするものである。The present invention is based on Nb-Al.
Nb-Al-W ternary system in which W is added to the system, a sigma phase is dispersed in the Al5 phase in the intermetallic compound in a specific range of the ternary system, and a composite of Nb-Al-based intermetallic compound excellent in strength characteristics at high temperature. It is intended to provide the body.
【０００５】[0005]
【課題を解決するための手段】シグマ相はヴィッカース
硬度が１０００以上と硬く非常に脆いため、単にＡｌ組
成を増加させてＡｌ５相にシグマ相を共存させるだけで
はシグマ相の欠点のみが現れるのみで、脆性が高く強度
の低い材料が得られるだけであった。Since the sigma phase has a Vickers hardness of 1000 or more and is very brittle, merely increasing the Al composition and allowing the sigma phase to coexist in the Al5 phase causes only the defects of the sigma phase. However, only a material having high brittleness and low strength was obtained.
【０００６】そこで本発明者等は、Ｎｂ−Ａｌ−Ｗ三元
系に現出する相についての詳細な研究の結果、図１に示
すようなＮｂ−Ａｌ−Ｗ三元系状態図を作成したが、さ
らに高強度化に適した添加元素および適切な組成、また
その強度発現のための処理方法を研究した。様々な組成
のＮｂ−Ａｌ−Ｗ系金属間化合物について、１６００℃
における圧縮強度を測定した結果、図１中斜線で示した
領域において出現するＡｌ５相にシグマ相が分散した組
織を有する材料は、高温強度の改善がなされることを知
見した。本発明は、これらの知見によってなされ、完成
に至ったものである。Then, the inventors of the present invention made a detailed study on the phases appearing in the Nb-Al-W ternary system and, as a result, prepared the Nb-Al-W ternary phase diagram as shown in FIG. Studied the additive elements suitable for higher strength, the appropriate composition, and the treatment method for developing the strength. For Nb-Al-W based intermetallic compounds of various compositions, 1600 ° C
As a result of measuring the compressive strength in Example 1, it was found that the material having a structure in which the sigma phase was dispersed in the Al5 phase appearing in the shaded area in FIG. The present invention has been completed based on these findings.
【０００７】本発明は、Ｎｂ−Ａｌ−Ｗ三元系において
Ａｌ５相に硬度の高いシグマ相を共存せしめ高温強度の
より高い材料、それを得るための最適な組成、および強
度を発現させるために適した処理温度を提供することを
目的とするものである。According to the present invention, in the Nb-Al-W ternary system, a material having higher high temperature strength by coexisting a sigma phase having high hardness in the Al5 phase, an optimum composition for obtaining the material, and strength are expressed. The purpose is to provide a suitable processing temperature.
【０００８】本発明は、下記の事項をその要旨とするも
のである。 Ａｌ２０．０〜３０．０原子％、Ｗ１．０〜１５．
０原子％および残部がＮｂからなり、Ａｌ５相中にシグ
マ相が分散した組織を有することを特徴とするＮｂ−Ａ
ｌ−Ｗ系金属間化合物。 Ａｌ２０．０〜３０．０原子％、Ｗ１．０〜１５．
０原子％および残部がＮｂからなり、１６００〜１８０
０℃でＨＩＰ処理もしくは熱処理することによりＡｌ５
相中にシグマ相が分散した組織を有することを特徴とす
るＮｂ−Ａｌ−Ｗ系金属間化合物。 Ａｌ２０．０〜２５．０原子％、Ｗ５．０〜１５．
０原子％および残部がＮｂからなり、１８００℃、１９
００気圧で４時間以上、ＨＩＰ処理することによってＡ
ｌ５相中にシグマ相が微細に分散した組織を有すること
を特徴とするＮｂ−Ａｌ−Ｗ系金属間化合物。The present invention has the following matters. Al20.0-30.0 atomic%, W1.0-15.
Nb-A characterized by having a structure in which 0 atomic% and the balance are Nb, and a sigma phase is dispersed in an Al5 phase.
1-W based intermetallic compound. Al20.0-30.0 atomic%, W1.0-15.
0 atom% and the balance Nb, 1600 to 180
Al5 by HIP treatment or heat treatment at 0 ° C
An Nb-Al-W-based intermetallic compound having a structure in which a sigma phase is dispersed in a phase. Al20.0-25.0 atomic%, W5.0-15.
0 atom% and the balance Nb, 1800 ° C., 19
By HIPing at 00 atm for 4 hours or more
15. An Nb-Al-W-based intermetallic compound having a structure in which a sigma phase is finely dispersed in an l5 phase.
【０００９】以下に、本発明を詳細に説明する。本発明
において１６００℃で高温強度が得られる金属間化合物
の組成は、Ａｌが２０．０〜３０．０原子％およびＷが
１．０〜１５．０原子％である。Ａｌは、２０．０原子
％より少ない場合、Ａｌ５相が単一相であるかもしくは
第二相が共存したとしても高温強度の点では不利なｂ．
ｃ．ｃ．相であるために強度が低下する。また、３０．
０原子％より多い場合、シグマ相が多すぎて脆性が大き
くなるため強度が劣る。The present invention will be described in detail below. In the present invention, the composition of the intermetallic compound capable of obtaining high temperature strength at 1600 ° C. is 20.0 to 30.0 atomic% of Al and 1.0 to 15.0 atomic% of W. When Al is less than 20.0 atomic%, it is disadvantageous in terms of high temperature strength even if the Al5 phase is a single phase or the second phase coexists. B.
c. c. Since it is a phase, the strength is reduced. Also, 30.
When it is more than 0 atomic%, the strength is poor because the brittleness becomes large due to too much sigma phase.
【００１０】また、Ｗの組成の範囲は、１．０原子％よ
り少ないと添加による効果が認られず、１５．０原子％
より多いと主相となるべきＡｌ５相金属間化合物が消失
してしまうために強度が低下する。Ｗは、Ｎｂと置換す
る添加元素であり、Ａｌが上記の組成範囲にあるＮｂ−
Ａｌ系材料に対してＡｌ５相が単一相で存在する領域を
狭め、シグマ相が共存する領域を広げる効果がある。同
時に元素としての融点も他の構成元素に比べ著しく高い
ために、材料全体の融点も上昇し、高温での特性向上に
寄与している。Further, if the composition range of W is less than 1.0 atomic%, the effect of addition is not recognized and 15.0 atomic%
If the amount is larger, the Al5 phase intermetallic compound, which should be the main phase, disappears, and the strength decreases. W is an additive element substituting for Nb, and Nb- with Al in the above composition range.
This has the effect of narrowing the region where the Al5 phase exists as a single phase and widening the region where the sigma phase coexists with respect to the Al-based material. At the same time, the melting point as an element is remarkably higher than that of the other constituent elements, so that the melting point of the entire material also rises, which contributes to the improvement of characteristics at high temperatures.
【００１１】さらに、より良い特性を得るためにはＡｌ
２０．０〜２５．０原子％およびＷ５．０〜１５．０原
子％（図１中、試料５および６が属する付近）が好まし
く、この範囲の組成物においてはシグマ相の析出とＷ添
加による高融点化の効果が最大限に働き、１６００℃で
２００ＭＰａ以上という極めて高い高温強度を示す。Further, in order to obtain better characteristics, Al
20.0 to 25.0 atomic% and W5.0 to 15.0 atomic% (in the vicinity of the samples 5 and 6 in FIG. 1) are preferable. In the composition within this range, sigma phase precipitation and W addition are caused. The effect of increasing the melting point is maximized, and extremely high temperature strength of 200 MPa or more at 1600 ° C. is exhibited.
【００１２】次いで、本発明の金属間化合物の製造法に
ついて説明する。まず、高周波誘導スカル溶解法またプ
ラズマアークメルト法など高融点金属であるＷを十分溶
かすことのできる高温溶解法によって、もしくは組成金
属の微粉末を混合し高温高圧下で焼成することによって
所望組成のインゴットを製造する。次いで、これを１６
００℃以上の温度で熱処理、もしくはＨＩＰ処理を行う
が、より好ましくは高温溶解法によって得られたインゴ
ットを１８００℃、１９００気圧以上の条件で４時間以
上、ＨＩＰ処理を行うことによって製造する。この処理
により分散されたシグマ相が微細となり、１６００℃で
２００ＭＰａ以上の強度を有する材料が得られる。Next, the method for producing the intermetallic compound of the present invention will be described. First, a high-frequency induction skull melting method or a high-temperature melting method capable of sufficiently melting W, which is a high-melting point metal, such as a plasma arc melting method, or by mixing fine powders of a constituent metal and firing at high temperature and high pressure, Manufacture ingots. Then this is 16
The heat treatment or the HIP treatment is performed at a temperature of 00 ° C. or higher, and more preferably, the ingot obtained by the high temperature melting method is subjected to the HIP treatment at a temperature of 1800 ° C. and 1900 atm for 4 hours or more. By this treatment, the dispersed sigma phase becomes fine and a material having a strength of 200 MPa or more at 1600 ° C. is obtained.
【００１３】[0013]
【実施例】以下に、本発明を実施例に基づいてさらに説
明する。高周波誘導スカルメルト溶解法により図１中に
１〜６の数字で示すような組成を有するＮｂ−Ａｌ−Ｗ
系材料を製造し、それぞれ１８００℃、１９００気圧で
ＨＩＰ処理の後、５φ×７ｍｍの試料１〜６を切り出し
て圧縮強度を比較した。加熱は真空中にて試料に直接電
流を流すことによる発熱を利用し、１６００℃で１分間
保持した後、５×１０-4の速度で圧縮を行った。また、
Ｘ線回析法によって各試料に含まれる相を解析し、シグ
マ相の現れている試料については主相であるＡｌ５相に
対するピーク比を求めた。その結果を、表１に示す。EXAMPLES The present invention will be further described below based on examples. Nb-Al-W having a composition as shown by the numbers 1 to 6 in FIG. 1 by the high frequency induction skull melt melting method.
After producing a system material and performing HIP treatment at 1800 ° C. and 1900 atm, samples 1 to 6 of 5φ × 7 mm were cut out and the compression strengths were compared. The heating was performed by utilizing the heat generated by directly passing an electric current through the sample in a vacuum, holding the sample at 1600 ° C. for 1 minute, and then compressing it at a rate of 5 × 10 −4 . Also,
The phases contained in each sample were analyzed by the X-ray diffraction method, and the peak ratio of the sample in which the sigma phase appeared to the main phase Al5 phase was determined. The results are shown in Table 1.
【００１４】[0014]
【表１】 [Table 1]
【００１５】表１に示す通り、いずれの試料も１００Ｍ
Ｐａ以上の強度を有している。特に、試料４、５および
６の強度が高く、構成相を解析したところいずれもシグ
マ相が３〜１５％含まれていた。また、ＡｌおよびＷが
より好ましい組成範囲に属する試料５と６は、１６００
℃において１８０〜２００ＭＰａを上回る、極めて高い
強度が得られている。As shown in Table 1, all the samples were 100M.
It has a strength of Pa or higher. In particular, the strength of Samples 4, 5 and 6 was high, and when the constituent phases were analyzed, all contained 3 to 15% of the sigma phase. In addition, samples 5 and 6 in which Al and W belong to a more preferable composition range are 1600
An extremely high strength exceeding 180 to 200 MPa at 0 ° C. is obtained.
【００１６】[0016]
【発明の効果】以上の通り、本発明により、１６００℃
の高温において２００ＭＰａという高強度を有する高温
構造用材料として利用可能なＮｂ−Ａｌ−Ｗ系金属間化
合物が得られる。As described above, according to the present invention, 1600 ° C.
It is possible to obtain an Nb-Al-W-based intermetallic compound that can be used as a high temperature structural material having a high strength of 200 MPa at a high temperature.
【図１】本発明の金属間化合物であるＮｂ−Ａｌ−Ｗ三
元系の状態図である。FIG. 1 is a phase diagram of an Nb—Al—W ternary system that is an intermetallic compound of the present invention.
Claims (3)
〜１５．０原子％および残部がＮｂからなり、Ａｌ５相
中にシグマ相が分散した組織を有することを特徴とする
Ｎｂ−Ａｌ−Ｗ系金属間化合物。1. Al20.0-30.0 atomic%, W1.0
˜15.0 atomic% and the balance Nb, and has a structure in which a sigma phase is dispersed in an Al5 phase, an Nb—Al—W intermetallic compound.
〜１５．０原子％および残部がＮｂからなり、１６００
〜１８００℃でＨＩＰ処理もしくは熱処理することによ
りＡｌ５相中にシグマ相が分散した組織を有することを
特徴とするＮｂ−Ａｌ−Ｗ系金属間化合物。2. Al20.0 to 30.0 atomic%, W1.0
~ 15.0 atomic% and the balance Nb, 1600
A Nb-Al-W based intermetallic compound having a structure in which a sigma phase is dispersed in an Al5 phase by HIP treatment or heat treatment at 1800C.
〜１５．０原子％および残部がＮｂからなり、１８００
℃、１９００気圧で４時間以上、ＨＩＰ処理することに
よってＡｌ５相中にシグマ相が微細に分散した組織を有
することを特徴とするＮｂ−Ａｌ−Ｗ系金属間化合物。3. Al20.0 to 25.0 atomic%, W5.0
~ 15.0 atomic% and the balance Nb, 1800
An Nb-Al-W-based intermetallic compound having a structure in which a sigma phase is finely dispersed in an Al5 phase by HIP treatment at 1900C for 4 hours or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6029359A JPH07238337A (en) | 1994-02-28 | 1994-02-28 | Nb-al intermetallic compound reinforced with sigma-phase |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6029359A JPH07238337A (en) | 1994-02-28 | 1994-02-28 | Nb-al intermetallic compound reinforced with sigma-phase |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07238337A true JPH07238337A (en) | 1995-09-12 |
Family
ID=12274002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6029359A Withdrawn JPH07238337A (en) | 1994-02-28 | 1994-02-28 | Nb-al intermetallic compound reinforced with sigma-phase |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07238337A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07252554A (en) * | 1994-03-14 | 1995-10-03 | Natl Res Inst For Metals | Method for inhibiting high-temperature oxidation of nb-al based alloy and nb-al based alloy obtained thereby |
| CN116288092A (en) * | 2023-03-29 | 2023-06-23 | 西北有色金属研究院 | Heat treatment method for improving hot processing performance of niobium alloy cast ingot |
-
1994
- 1994-02-28 JP JP6029359A patent/JPH07238337A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07252554A (en) * | 1994-03-14 | 1995-10-03 | Natl Res Inst For Metals | Method for inhibiting high-temperature oxidation of nb-al based alloy and nb-al based alloy obtained thereby |
| CN116288092A (en) * | 2023-03-29 | 2023-06-23 | 西北有色金属研究院 | Heat treatment method for improving hot processing performance of niobium alloy cast ingot |
| CN116288092B (en) * | 2023-03-29 | 2024-05-10 | 西北有色金属研究院 | Heat treatment method for improving hot processing performance of niobium alloy cast ingot |
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