Alperm: Difference between revisions
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{{Short description|Class of alloys with high magnetostriction}} |
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'''Alperm''' (also '''alfenol''' or '''alfer''') |
'''Alperm''' (also '''alfenol''' or '''alfer''') is a class of [[alloy]]s comprising 83-90% of [[iron]] and 10-17% of [[aluminium]]. The most widely used composition is with 16% Al.<ref>{{Cite web |url=http://ir.library.tohoku.ac.jp/re/bitstream/10097/27088/1/KJ00004196996.pdf |title=Effect of Aging on the Maximum Permeability in Quenched Fe-Al Alloys (Alperm) |access-date=2010-04-07 |archive-url=https://web.archive.org/web/20120602075353/http://ir.library.tohoku.ac.jp/re/bitstream/10097/27088/1/KJ00004196996.pdf |archive-date=2012-06-02 |url-status=dead }}</ref> |
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An alloy with 13% Al is also sometimes referred to as '''alfer'''. It exhibits large [[magnetostriction]] and it is used in magnetoelastic sensors. Later during the WW2, Japanese used the alloy with 12.7-12.9% aluminium as a replacement of [[nickel]] for the magnetostrictive transducers used in their Type 93 model 5, Type 3, and Simple naval [[sonar]]s.<ref>{{Cite web |url=http://www.fischer-tropsch.org/primary_documents/gvt_reports/USNAVY/USNTMJ%20Reports/USNTMJ-200B-0343-0412%20Report%20E-10.pdf |title=Archived copy |access-date=2015-05-08 |archive-url=https://web.archive.org/web/20150924013502/http://www.fischer-tropsch.org/primary_documents/gvt_reports/USNAVY/USNTMJ%20Reports/USNTMJ-200B-0343-0412%20Report%20E-10.pdf |archive-date=2015-09-24 |url-status=dead }}</ref> |
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An alloy with 13% Al is also sometimes referred to as '''alfer'''. It exhibits large [[magnetostriction]] and it is used in magnetoelastic sensors. |
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Alperm is [[Soft magnetic material|magnetically soft]] and exhibits high [[magnetic permeability]]. The material can be produced in 0.5 |
Alperm is [[Soft magnetic material|magnetically soft]] and exhibits high [[magnetic permeability]]. The material can be produced in 0.5 mm thick sheets, as well as 50-60 μm thick ribbons.<ref>{{cite journal|title=Magnetic properties of rapidly quenched alperm ribbons |journal=Journal of Magnetism and Magnetic Materials |volume=41 |issue=1–3 |pages=149–151 | doi=10.1016/0304-8853(84)90161-6|year=1984 |last1=Yamashiro |first1=Y. |last2=Teshima |first2=N. |last3=Narita |first3=K. |bibcode=1984JMMM...41..149Y }}</ref> |
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The [[coercivity]] is usually below 5 A/m (for alfer it is around 50 A/m) and permeability 55 000 (for alfer 4000). Saturation flux density is 0.8 T (for alfer 1.28 T). |
The [[coercivity]] is usually below 5 A/m (for alfer it is around 50 A/m) and permeability 55 000 (for alfer 4000). Saturation flux density is 0.8 T (for alfer 1.28 T). |
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The addition of Al increases electrical [[resistivity]] of alloy up to 140 μΩm, which is almost four times the value in commonly used 3% SiFe [[electrical steel]]. For this reason alperm can be used in higher frequency range. However, because of the Al content the material is more susceptible to [[oxidation]]. |
The addition of Al increases electrical [[resistivity]] of alloy up to 140 μΩm, which is almost four times the value in commonly used 3% SiFe [[electrical steel]]. For this reason alperm can be used in higher frequency range. However, because of the Al content the material is more susceptible to [[oxidation]]. |
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The alloy was |
The alloy was first synthesized and characterized by [[Japan]]ese researchers H. Masumoto and Hideo Saito in 1939. |
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== References == |
== References == |
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* [[Sendust]] |
* [[Sendust]] |
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[[Category:Ferrous alloys]] |
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[[Category: |
[[Category:Magnetic alloys]] |
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[[Category:Aluminium alloys]] |
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Latest revision as of 16:49, 7 September 2023
Alperm (also alfenol or alfer) is a class of alloys comprising 83-90% of iron and 10-17% of aluminium. The most widely used composition is with 16% Al.[1]
An alloy with 13% Al is also sometimes referred to as alfer. It exhibits large magnetostriction and it is used in magnetoelastic sensors. Later during the WW2, Japanese used the alloy with 12.7-12.9% aluminium as a replacement of nickel for the magnetostrictive transducers used in their Type 93 model 5, Type 3, and Simple naval sonars.[2]
Alperm is magnetically soft and exhibits high magnetic permeability. The material can be produced in 0.5 mm thick sheets, as well as 50-60 μm thick ribbons.[3]
The coercivity is usually below 5 A/m (for alfer it is around 50 A/m) and permeability 55 000 (for alfer 4000). Saturation flux density is 0.8 T (for alfer 1.28 T).
The addition of Al increases electrical resistivity of alloy up to 140 μΩm, which is almost four times the value in commonly used 3% SiFe electrical steel. For this reason alperm can be used in higher frequency range. However, because of the Al content the material is more susceptible to oxidation.
The alloy was first synthesized and characterized by Japanese researchers H. Masumoto and Hideo Saito in 1939.
References
[edit]- ^ "Effect of Aging on the Maximum Permeability in Quenched Fe-Al Alloys (Alperm)" (PDF). Archived from the original (PDF) on 2012-06-02. Retrieved 2010-04-07.
- ^ "Archived copy" (PDF). Archived from the original (PDF) on 2015-09-24. Retrieved 2015-05-08.
{{cite web}}: CS1 maint: archived copy as title (link) - ^ Yamashiro, Y.; Teshima, N.; Narita, K. (1984). "Magnetic properties of rapidly quenched alperm ribbons". Journal of Magnetism and Magnetic Materials. 41 (1–3): 149–151. Bibcode:1984JMMM...41..149Y. doi:10.1016/0304-8853(84)90161-6.