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PERMALLOY 80 - SOFT MAGNETIC ALLOY

 

 

 

              Permalloy 80, a Nickel-Iron-Molybdenum alloy, provides very high initial and maximum magnetic permeabilities and minimal core losses at low field strengths. This vacuum-melted product also offers the advantages of small size and weight in magnetic core and shielding materials for the applications shown below.

 

 

Applications:

 

              Permalloy 80 provides high initial and maximum permeabilities with low coercive force, low hysteresis loss, low eddy-current losses, and low magnetostriction. Typical applications for this material are:

 

                          Transformer laminations

                          Filters

                          Relays

                          Recording Heads

                          Deflection and Focusing Yokes

                          Amplifiers

                          Loudspeakers

                          Shielding

 

 

MAGNETIC PROPERTIES*

 

Typical D.C. Magnetic Properties:

 

              Saturation Flux Density:                                7,500 gausses

              Coercive Force from H = 1 oersted:               0.015 oersted

              Residual Induction:                                        3,700 gausses

              Hysteresis Loss from Saturation:                   9 ergs/cm3/cycle

              Permeability @ B = 100:                                75,000

              Maximum Permeability:                                 300,000

 

*After appropriate anneal.

 

 

Minimum Magnetic Permeabilities:

(B = 40 gauss @ 60 Hz)

                                  Thickness                   μ

                                      .001"                   50,000

                                      .002"                   55,000

                                      .004"                   65,000

                                      .006"                   55,000

                                      .014"                   50,000

 

All specimens were ring laminations.

 

 

 


PHYSICAL PROPERTIES:

 

Density:  g/cm3                               8.74

                lb./in3                               0.316

 

Electrical Resistivity:

                microhm-cm                    58

                ohm/cer mil-ft                  349

 

Specific Heat:

                 cal/g/oC                            0.12

 

Thermal Conductivity:

                cal/cm3/sec/oC                 0.047

                BTU/in/ft2/hr/oF              136

 

Thermal Expansion

                Coefficient: in/in/oC

                (-70 to +200 oC)              12.0 x 10-6

 

Curie Temperature:                       450 oC

                                                         845 oF

 

 

TYPICAL CHEMICAL COMPOSITION:

 

       Nickel                         80%

       Molybdenum              4.4%

       Silicon                        0.3%

       Manganese                 0.5%

       Iron                             Balance

 

 

TYPICAL MECHANICAL PROPERTIES:

 

                                                                                                                     Annealed for

                                                                   Cold                     Mill                 Magnetic

                                                                  Rolled               Annealed           Properties

 

Tensile Strength:                                      150 ksi                  90 ksi                   80 ksi

Yield Strength:                                         135 ksi                  35 ksi                   30 ksi

% Elongation in 2":                                       2                         40                        40

Hardness:                                                    32RC                    70RB                    55RB