JPH05195124A - Shape memory alloy - Google Patents
Shape memory alloyInfo
- Publication number
- JPH05195124A JPH05195124A JP4296451A JP29645192A JPH05195124A JP H05195124 A JPH05195124 A JP H05195124A JP 4296451 A JP4296451 A JP 4296451A JP 29645192 A JP29645192 A JP 29645192A JP H05195124 A JPH05195124 A JP H05195124A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- transformation
- shape memory
- memory alloy
- transformation temperature
- 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.)
- Granted
Links
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は形状記憶合金に関し、
詳しくは変態温度の高い形状記憶合金に関する。This invention relates to shape memory alloys,
Specifically, it relates to a shape memory alloy having a high transformation temperature.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】形状記
憶合金は、低温状態（マルテンサイト相状態）で変形を
加えてもこれを所定温度まで加温すると予め記憶させて
ある形状に復元するもので、その特異な性質を利用して
様々な分野で用いられている。2. Description of the Related Art Shape memory alloys are those which, even if they are deformed in a low temperature state (martensite phase state), are restored to a previously stored shape when heated to a predetermined temperature. It is used in various fields due to its unique properties.
【０００３】かかる形状記憶合金としては，ＣｕＺｎＡ
ｌ系合金，ＣｕＡｌＮｉ系合金及びＮｉＴｉ系合金が知
られているが、疲労特性等の点から実際にはＮｉとＴｉ
との原子比が１：１に近い組成のＮｉＴｉ系合金が広く
使用されている。CuZnA is one of such shape memory alloys.
L-based alloys, CuAlNi-based alloys, and NiTi-based alloys are known, but Ni and Ti are actually used in terms of fatigue characteristics.
NiTi-based alloys having a composition in which the atomic ratio of and are close to 1: 1 are widely used.
【０００４】このＮｉＴｉ系合金は、変態温度がＮｉ濃
度に依存し、Ｎｉ：４９．６〜５１．５原子％の組成範
囲ではＮｉ濃度の増加とともに変態温度が直線的に低下
する。In this NiTi-based alloy, the transformation temperature depends on the Ni concentration, and the transformation temperature linearly decreases as the Ni concentration increases in the composition range of Ni: 49.6 to 51.5 atomic%.
【０００５】尤も焼なまし温度を低温化すると変態温度
が上昇するなど、熱処理条件等によっても変態温度は変
動する。The transformation temperature also changes depending on the heat treatment conditions such as the transformation temperature rising when the annealing temperature is lowered.
【０００６】しかしながらＮｉ濃度，熱処理条件を変え
て変態温度の上昇を図っても、せいぜいＡｓ＝約１００
℃（Ａｓ：加熱時のマルテンサイト相→母相の変態開始
温度）どまりである。However, even if the Ni concentration and the heat treatment conditions are changed to raise the transformation temperature, As = at most 100
C. (As: temperature at which transformation starts from the martensite phase to the parent phase during heating).
【０００７】ＮｉＴｉ系合金の変態温度をコントロ−ル
する方法として、Ｖ，Ｃｒ，Ｍｎ，Ｆｅ，Ｃｏ等の３ｄ
遷移金属或いはＡｌ，Ｓｉ等の第三元素を添加する方法
がある。しかしながらこれら成分の添加は変態温度を低
下させる方向である。As a method for controlling the transformation temperature of a NiTi alloy, 3d of V, Cr, Mn, Fe, Co, etc. is used.
There is a method of adding a transition metal or a third element such as Al or Si. However, the addition of these components tends to lower the transformation temperature.
【０００８】但しＮｉＴｉ系合金のＮｉの一部をＣｕで
置換した場合は例外的で、Ｃｕ添加によっても変態温度
は低下せず、むしろ若干上昇する傾向を示すが、Ｃｕの
置換のみでは変態温度１００℃以上にはならないのが現
状である。However, it is exceptional when a part of Ni of the NiTi-based alloy is replaced by Cu, and the transformation temperature does not decrease even when Cu is added, but rather tends to slightly rise, but only by the substitution of Cu, the transformation temperature tends to increase. At present, the temperature does not exceed 100 ° C.
【０００９】上記のように従来のＮｉＴｉ系合金の場
合、作動温度（変態温度）が１００℃以下であるため、
その応用範囲が自ずと限定されてしまう問題があった。
そこで種々の分野において１００℃以上の変態温度を有
する材料の開発が待たれているのが実情である。As described above, in the case of the conventional NiTi-based alloy, the operating temperature (transformation temperature) is 100 ° C. or lower,
There was a problem that its application range was naturally limited.
Therefore, the fact is that development of materials having a transformation temperature of 100 ° C. or higher is awaited in various fields.
【００１０】現在のところ、変態温度（Ａｆ）が１００
℃以上のＮｉＴｉ系合金としてＮｉＴｉＰｄ合金が報告
されている。At present, the transformation temperature (Af) is 100.
A NiTiPd alloy has been reported as a NiTi-based alloy having a temperature of ℃ or higher.
【００１１】しかしながらこの合金の場合、１２原子％
Ｐｄまでは変態温度が低下し、変態温度の高温化を図る
ためには１８原子％以上のＰｄの添加が必要である。However, in the case of this alloy, 12 atomic%
The transformation temperature lowers up to Pd, and in order to raise the transformation temperature, it is necessary to add 18 atomic% or more of Pd.
【００１２】Ｐｄは高価な元素であって、このように多
量に添加が必要であるとなるとコストが大幅に高くなっ
てしまう問題がある。Pd is an expensive element, and if it is necessary to add Pd in such a large amount, there is a problem that the cost will increase significantly.
【００１３】[0013]
【課題を解決するための手段】本発明はこのような課題
を解決するためになされたものであり、その要旨は、形
状記憶合金の組成をＮｉ：３６〜４８原子％，Ｃｕ：９
〜１０原子％，Ｈｆ：３〜１６原子％，残部Ｔｉから成
る組成とすることにある。The present invention has been made in order to solve such a problem, and the gist thereof is that the composition of a shape memory alloy is Ni: 36 to 48 atomic%, Cu: 9
10 to 10 atomic%, Hf: 3 to 16 atomic%, and the balance Ti.
【００１４】本発明に従い、ＮｉＴｉ系合金においてＮ
ｉをＣｕで一部置換し且つＴｉを一部置換する形で第三
元素としてのＨｆを所定量添加することにより、それら
ＣｕとＨｆとの相乗効果により変態温度が効果的に上昇
することが確認された。In accordance with the present invention, N in NiTi based alloys
By adding a predetermined amount of Hf as the third element such that i is partially replaced by Cu and Ti is partially replaced, the transformation temperature can be effectively increased by the synergistic effect of Cu and Hf. confirmed.
【００１５】かかる本発明によればＮｉＴｉ系合金にお
いて変態温度をＡｆで１００℃以上とすることも容易で
あり、形状記憶合金の応用範囲を従来より飛躍的に広げ
ることが可能となる。According to the present invention, it is easy to set the transformation temperature of the NiTi alloy to 100 ° C. or higher in Af, and the range of application of the shape memory alloy can be dramatically expanded as compared with the conventional one.
【００１６】また形状記憶合金をアクチュエータとして
用いたとき、その応答性を高めることができる。変態温
度を高くすることによって高温相（母相）から低温相
（マルテンサイト相）に速やかに戻すことが可能となる
からである。When a shape memory alloy is used as an actuator, its responsiveness can be improved. This is because by increasing the transformation temperature, it becomes possible to quickly return from the high temperature phase (mother phase) to the low temperature phase (martensite phase).
【００１７】本発明においてＣｕの添加量を９〜１０原
子％に限定したのは、９％より少ないと変態温度Ａｆの
上昇効果が少なく、また１０％を超えて添加すると変態
温度Ａｆは低下する傾向を示すことによる。またＨｆの
添加量を３〜１６原子％と限定しているのは、３％より
少ない場合には変態温度Ａｆの上昇効果が少なく、逆に
１６％を超えて添加するとコストが高くなる他、加工性
が低下するためである。In the present invention, the amount of Cu added is limited to 9 to 10 atom%. If it is less than 9%, the effect of raising the transformation temperature Af is small, and if it is added in excess of 10%, the transformation temperature Af is lowered. By showing a trend. Further, the amount of Hf added is limited to 3 to 16 atom%, when the amount is less than 3%, the effect of increasing the transformation temperature Af is small. This is because the workability is reduced.
【００１８】本発明においては、Ｎｉ原子とＣｕ原子と
の和が４５〜５１原子％となるように組成を調整した場
合において、特に優れた効果が得られることが確認され
ている。In the present invention, it has been confirmed that particularly excellent effects can be obtained when the composition is adjusted so that the sum of Ni atoms and Cu atoms is 45 to 51 atom%.
【００１９】[0019]
【実施例】次に本発明の特徴を更に明確にすべく、以下
にその実施例を詳述する。ペレット状Ｎｉ，スポンジＴ
ｉ及び板状Ｈｆの各原料を、表１の各組成となるように
アルゴン雰囲気の高周波誘導溶解炉で溶解した後、鋳造
し、次いで熱間鍛造→サンプル切断の各工程を経た後、
５００℃×３０分水焼入れの条件で熱処理を施し、形状
記憶させた。EXAMPLES In order to further clarify the characteristics of the present invention, examples thereof will be described in detail below. Pellet Ni, sponge T
After melting each raw material of i and the plate-like Hf in a high frequency induction melting furnace in an argon atmosphere so as to have the respective compositions shown in Table 1, casting, and then through each step of hot forging → sample cutting,
A heat treatment was performed under the conditions of water quenching at 500 ° C. for 30 minutes, and the shape was memorized.
【００２０】次にこれら試料について示差走査熱量計に
より変態温度測定を行った。結果が表１に併せて示して
ある。但し表中のＡｓ温度（昇温時の変態開始温度）と
Ａｆ温度（昇温時の変態終了温度）は変態に伴う吸熱ピ
ークから求め、またＭｓ温度（降温時の変態開始温度）
とＭｆ温度（降温時の変態終了温度）とは変態に伴う発
熱ピークからそれぞれ求めた。Next, the transformation temperature of these samples was measured by a differential scanning calorimeter. The results are also shown in Table 1. However, the As temperature (transformation start temperature at the time of temperature rise) and the Af temperature (transformation end temperature at the time of temperature rise) in the table are obtained from the endothermic peak associated with the transformation, and the Ms temperature (transformation start temperature at the time of temperature decrease)
And Mf temperature (transformation end temperature at the time of temperature decrease) were obtained from the exothermic peaks associated with the transformation.
【００２１】[0021]
【表１】 [Table 1]
【００２２】表の結果から、Ｈｆの添加によって、また
その添加量が増大するにつれて変態温度が上昇するこ
と、変態温度の上昇はＮｉ原子とＣｕ原子の総和によっ
て異なることがわかる。From the results in the table, it is understood that the transformation temperature rises with the addition of Hf and as the amount of Hf added increases, and that the transformation temperature rises depend on the total amount of Ni atoms and Cu atoms.
【００２３】以上本発明の実施例を詳述したがこれはあ
くまで一例示であり、本発明はその主旨を逸脱しない範
囲において、当業者の知識に基づき種々変更を加えるこ
とが可能である。Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be variously modified based on the knowledge of those skilled in the art without departing from the spirit of the invention.
Claims (2)
０原子％，Ｈｆ：３〜１６原子％，残部Ｔｉから成るこ
とを特徴とする形状記憶合金。1. Ni: 36 to 48 atomic%, Cu: 9 to 1
A shape memory alloy comprising 0 atomic%, Hf: 3 to 16 atomic% and the balance Ti.
原子％であることを特徴とする請求項１に記載の形状記
憶合金。2. The sum of Ni atoms and Cu atoms is 45 to 51.
The shape memory alloy according to claim 1, wherein the shape memory alloy is atomic%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29645192A JP3271329B2 (en) | 1991-10-09 | 1992-10-08 | Shape memory alloy |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29067691 | 1991-10-09 | ||
| JP3-290676 | 1991-10-09 | ||
| JP29645192A JP3271329B2 (en) | 1991-10-09 | 1992-10-08 | Shape memory alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05195124A true JPH05195124A (en) | 1993-08-03 |
| JP3271329B2 JP3271329B2 (en) | 2002-04-02 |
Family
ID=26558175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29645192A Expired - Fee Related JP3271329B2 (en) | 1991-10-09 | 1992-10-08 | Shape memory alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3271329B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8416573B2 (en) | 2010-08-10 | 2013-04-09 | Empire Technology Development Llc. | Fluid cooling |
| WO2019073754A1 (en) | 2017-10-10 | 2019-04-18 | 株式会社古河テクノマテリアル | Ti-Ni ALLOY, WIRE, ELECTRIFICATION ACTUATOR AND TEMPERATURE SENSOR USING SAME, AND METHOD FOR MANUFACTURING Ti-Ni ALLOY MATERIAL |
-
1992
- 1992-10-08 JP JP29645192A patent/JP3271329B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8416573B2 (en) | 2010-08-10 | 2013-04-09 | Empire Technology Development Llc. | Fluid cooling |
| WO2019073754A1 (en) | 2017-10-10 | 2019-04-18 | 株式会社古河テクノマテリアル | Ti-Ni ALLOY, WIRE, ELECTRIFICATION ACTUATOR AND TEMPERATURE SENSOR USING SAME, AND METHOD FOR MANUFACTURING Ti-Ni ALLOY MATERIAL |
| KR20200019112A (en) | 2017-10-10 | 2020-02-21 | 후루카와 테크노 메탈리알 컴퍼니., 리미티드. | Ti-Ni alloy, wire rod, energizing actuator and temperature sensor using the same, and manufacturing method of Ti-Ni alloy material |
| JPWO2019073754A1 (en) * | 2017-10-10 | 2020-09-17 | 株式会社古河テクノマテリアル | Ti-Ni alloy, wire rod using it, energizing actuator and temperature sensor, and manufacturing method of Ti-Ni alloy |
| US11313732B2 (en) | 2017-10-10 | 2022-04-26 | Furukawa Techno Material Co., Ltd. | Ti—Ni-based alloy; wire, electrically conductive actuator, and temperature sensor, each using this alloy; and method of producing a Ti—Ni-based alloy |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3271329B2 (en) | 2002-04-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |