MIL-STD-1537 Electrical Conductivity Test For Verification Of Heat Treatment Of Aluminum Alloys, Eddy Current MethodThis standard contains procedures for verifying aluminum alloy heat treatment by means of eddy current techniques, which measure electrical conductivity. Aluminum alloy heat treatment can be verified when electrical conductivity measurements are used in conjunction with hardness measurements.

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MIL-STD-1537C

National Aerospace Standard (NAS)

AIA/NAS 410                         Certification and Qualification of Nondestructive Test

Personnel

(Application for copies of NAS should be addressed to the Aerospace Industries Association of

America, 1250 I Street NW, Suite 1100, Washington DC 20005-3924) International Standards  (ISO)

ISO 10012-1                         Quality Assurance for Measuring Equipment

(Application for copies should be addressed to the Aerospace Industries Association of America

Inc., 1725 DeSales Ste N.W. Washington DC 20036)

2.3    Order of precedence.

In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3     DEFINITIONS

3.1    Volume resistivity.

Volume resistivity, p, is the resistivity of a known volume of nonferrous metal expressed in ohm (centimeters)2 per centimeter or simply ohm centimeters, where the area is of uniform cross- section A in sq cm and the resistance R in ohms is the value for a known length L in cm of the area A, or expressed in equation form

p  = RA  (ohm centimeters) @ 20°C (68°F) L

3.2    Conductivity.

The conductivity, a, of a material is the reciprocal of volume resistivity or 1/p.  It is the relative value of conductivity of any nonferrous metal, to the arbitrary value set for commercially pure copper, and is usually expressed in percent International Annealed Copper Standard (percent IACS or %IACS), at 20°C by definition, where copper = 100 %IACS.

3.3    Percent IACS (International Annealed Copper Standard).

Percent IACS is the percent value of the conductivity of a material compared to the IACS standard value. The IACS standard is a commercially pure copper rod one meter long with a uniform cross-section of 1 mm2 with resistance of 1/58 (0.017241) ohms at 20°C. The conductivity of this standard is considered to be 100 %IACS.

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