Permalloy 1j76 Ni76Cr2Cu5 E11a High Permeability Soft Magnetic
Alloy Wire
1J76 (Soft magnetic alloy)
1J76 is a nickel-iron magnetic alloy, with about 80% nickel and 20%
iron content. Invented in 1914 by physicist Gustav Elmen at Bell
Telephone Laboratories,
it is notable for its very high magnetic permeability, which makes
it useful as a magnetic core material in electrical and electronic
equipment, and also in magnetic shielding to block magnetic fields.
Commercial permalloy alloys typically have relative permeability of
around 100,000, compared to several thousand for ordinary steel.
In addition to high permeability, its other magnetic properties are
low coercivity, near zero magnetostriction, and significant
anisotropic magnetoresistance. The low magnetostriction is critical
for industrial applications, allowing it to be used in thin films
where variable stresses would otherwise cause a ruinously large
variation in magnetic properties.
Permalloy's electrical resistivity can vary as much as 5% depending
on the strength and the direction of an applied magnetic field.
Permalloys typically have the face centered cubic crystal structure
with a lattice constant of approximately 0.355 nm in the vicinity
of a nickel concentration of 80%.
A disadvantage of permalloy is that it is not very ductile or
workable, so applications requiring elaborate shapes, such as
magnetic shields, are made of other high permeability alloys such
as mu metal. Permalloy is used in transformer laminations and
magnetic recording heads.
1J76 widely used in radio-electronic industry, precision
instruments, remote control and automatic control system.
Normal composition%
| Ni | 75~76.5 | Fe | Bal. | Mn | 0.3~0.6 | Si | 0.15~0.3 |
| Mo | - | Cu | 4.8~5.2 | Cr | 1.8~2.2 | | |
| C | ≤0.03 | P | ≤0.02 | S | ≤0.02 | | |
Typical Mechanical properties
| Yield strength | Tensile Strength | Elongation |
| Mpa | Mpa | % |
| 980 | 1030 | 3~50 |
Typical Physical properties
| Density (g/cm3) | 8.6 |
| Electrical resistivity at 20ºC(Om*mm2/m) | 0.55 |
| Coefficient of linear expansion(20ºC~200ºC)X10-6/ºC | 10.3~11.5 |
| Saturation magnetostriction coefficient λθ/ 10-6 | 2.4 |
| Curie point Tc/ ºC | 400 |
The magnetic properties of alloys with high permeability in weak
fields |
| 1J76 | Initial permeability | Maximum permeability | Coercivity | Saturation magnetic induction intensity |
Сold-rolled strip/ sheet.
Thickness, mm | μ0.08/ (mH/m) | μm/ (mH/m) | Hc/ (A/m) | BS/ T |
| ≥ | ≤ |
| 0.01 mm | 17.5 | 87.5 | 5.6 |
0.75 |
| 0.1~0.19 mm | 25.0 | 162.5 | 2.4 |
| 0.2~0.34 mm | 28.0 | 225.0 | 1.6 |
| 0.35~1.0 mm | 30.0 | 250.0 | 1.6 |
| 1.1~2.5 mm | 27.5 | 225.0 | 1.6 |
| 2.6~3.0 mm | 26.3 | 187.5 | 2.0 |
| cold drawn wire | |
| 0.1 mm | 6.3 | 50 | 6.4 |
| Bar | |
| 8-100 mm | 25 | 100 | 3.2 |
| Mode of heat treatment 1J76 |
| Annealing media | Vacuum with a residual pressure not higher than 0.1Pa, hydrogen
with a dew point of not higher than minus 40 ºC. |
| The heating temperature and rate | 1100~1150ºC |
| Holding time | 3~6 |
| Cooling rate | With 100 ~ 200 ºC/ h cooled to 600 ºC, rapidly cooled to 300ºC |
Style of supply
| Alloys Name | Type | Dimension | |
| 1J76 | Wire | D= 0.1~8mm | |
| 1J76 | Strip | W= 8~390mm | T= 0.3mm |
| 1J76 | Foil | W= 10~100mm | T= 0.01~0.1 |
| 1J76 | Bar | Dia= 8~100mm | L= 50~1000 |
