EP0043388A1 - Alliage-mémoire à base de cuivre, de zinc et d'aluminium et procédé pour sa fabrication - Google Patents
Alliage-mémoire à base de cuivre, de zinc et d'aluminium et procédé pour sa fabrication Download PDFInfo
- Publication number
- EP0043388A1 EP0043388A1 EP80200650A EP80200650A EP0043388A1 EP 0043388 A1 EP0043388 A1 EP 0043388A1 EP 80200650 A EP80200650 A EP 80200650A EP 80200650 A EP80200650 A EP 80200650A EP 0043388 A1 EP0043388 A1 EP 0043388A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- memory alloy
- zinc
- annealing
- copper
- production
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/006—Resulting in heat recoverable alloys with a memory effect
Definitions
- the invention is based on a memory alloy according to the preamble of claim 1 and a method for its production according to the preamble of claim 5.
- Memory alloys based on Cu / Zn / Al are known (eg L. Delaey, E. Aernoudt and J. Roos, "The shape memory and the high damping in copper-zinc-aluminum alloys", metal, issue 12, 31st year 1977, p. 1325 ff.).
- the manufacture and properties of such memory alloys have been described variously (e.g., U.S. Patent No. 4,014,716).
- the alloys, which originally existed as cast ingots are first thermoformed, heat-treated, cold-formed and finally subjected to a final heat treatment and a quenching process in order to obtain the ⁇ phase or the martensitic structure. These operations often have to be carried out repeatedly in succession in order to arrive at the final dimensions of the workpiece.
- the object of the invention is to propose a suitable microstructure and composition as well as a manufacturing and further processing method for the class of Cu / Zn / Al memory alloys, which significantly increases the cold formability and thus reduces the number of process steps, in particular the required intermediate annealing. can.
- a copper-zinc-aluminum alloy was melted as follows:
- This mixture was placed in a graphite firebrick crucible and melted down under argon as well as in a standing mold cast from iron.
- the cast ingot was 100 mm in diameter and 400 mm high and weighed 23 kg. Its composition was as follows:
- a cylinder with a diameter of 100 mm and a length of 100 mm was cut from the ingot and inserted into an extrusion press as a press bolt.
- the extrusion was carried out at a temperature of 700 ° C.
- a rod with a diameter of 13.5 mm was produced, so that the reduction ratio was 1:55.
- Due to the high degree of heat distortion of a mixture of oC was by subsequent annealing at 700 0 C for 10 min, a fine-grained microstructure of equiaxed crystallites - and / 3-phase produced.
- the average crystallite diameter of the ⁇ phase was 5 to 25 ⁇ .
- the metallographic examination showed that the volume fraction of ⁇ phase was approximately 60%.
- Example 1 should only be used for comparison with Example 1 according to the invention and be relates to conventional methods according to the prior art.
- Example 2 The same copper-zinc-aluminum alloy specified under Example 1 was used as the starting material.
- a 13.5 mm diameter wire produced by extrusion was subjected to annealing at 820 ° C. for 10 minutes. This state corresponded to a point in the ⁇ mixed crystal region. After the air had been cooled, a coarse-grained mixed structure of the Widmannstatten type consisting of the ⁇ and the ⁇ phase was found. The crystallites had a size of 250 to 1000 ⁇ .
- the rod was also sharpened by round hammering and reduced to a diameter of 9.1 mm by cold drawing until it broke. This corresponded to a cross-sectional decrease of only 54%.
- the Cu / Zn / Al alloys suitable for this process can consist of 2 to 9% by weight of Al, 15 to 32% by weight of Zn, the rest of Cu, but in particular of 2 to 6% by weight of Al, 21 to 32 % By weight Zn, balance Cu or from 6 to 9% by weight Al, 15 to 27% by weight Zn, balance Cu.
- the first hot deformation to be carried out in the ( ⁇ + ⁇ ) phase space should be at least 20% based on the original cross section. All annealing and hot forming operations are advantageously carried out in the temperature range from 500 to 800 ° C.
- the method according to the invention created copper-zinc-aluminum memory alloys which have a high degree of cold formability and are particularly suitable for processing on sheet metal and wire material.
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Extraction Processes (AREA)
- Conductive Materials (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP80200650A EP0043388A1 (fr) | 1980-07-04 | 1980-07-04 | Alliage-mémoire à base de cuivre, de zinc et d'aluminium et procédé pour sa fabrication |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP80200650A EP0043388A1 (fr) | 1980-07-04 | 1980-07-04 | Alliage-mémoire à base de cuivre, de zinc et d'aluminium et procédé pour sa fabrication |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0043388A1 true EP0043388A1 (fr) | 1982-01-13 |
Family
ID=8187019
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80200650A Withdrawn EP0043388A1 (fr) | 1980-07-04 | 1980-07-04 | Alliage-mémoire à base de cuivre, de zinc et d'aluminium et procédé pour sa fabrication |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0043388A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003035918A2 (fr) * | 2001-10-22 | 2003-05-01 | Council Of Scientific And Industrial Research | Alliage cu-zn-al(6%) a faible temperature de transformation martensitique et procede associe |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2011479A (en) * | 1977-12-28 | 1979-07-11 | Leuven Res & Dev Vzw | Process of manufacturing solid bodies of copper zincaluminium alloys |
-
1980
- 1980-07-04 EP EP80200650A patent/EP0043388A1/fr not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2011479A (en) * | 1977-12-28 | 1979-07-11 | Leuven Res & Dev Vzw | Process of manufacturing solid bodies of copper zincaluminium alloys |
Non-Patent Citations (1)
Title |
---|
Metall, Band 31, Nr. 12, Dezember 1977, Berlin, L. DELAEY et al, "Das Formerinnerungsvermogen und die hohe Dampfung in Kupferzink-Aluminium-Legierungen" Seiten 1325 bis 1331 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003035918A2 (fr) * | 2001-10-22 | 2003-05-01 | Council Of Scientific And Industrial Research | Alliage cu-zn-al(6%) a faible temperature de transformation martensitique et procede associe |
WO2003035918A3 (fr) * | 2001-10-22 | 2003-11-13 | Council Scient Ind Res | Alliage cu-zn-al(6%) a faible temperature de transformation martensitique et procede associe |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): BE CH DE FR GB IT SE |
|
RBV | Designated contracting states (corrected) |
Designated state(s): BE CH DE FR GB IT LI SE |
|
17P | Request for examination filed |
Effective date: 19820213 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19840119 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MELTON, KEITH, DR. Inventor name: MERCIER, OLIVIER, DR. |