SEDL / STP / STP1045-EB / STP24625S

An Evaluation of Three Techniques for Determining the Young's Modulus of Mechanically Alloyed Materials

Smith, JS
Metallurgist-AdvancedProject Specialist, Inco Alloys International, Inc., Research and Development, Huntington, WV

Wyrick, MD
Metallurgist-AdvancedProject Specialist, Inco Alloys International, Inc., Research and Development, Huntington, WV

Poole, JM
Metallurgist-AdvancedProject Specialist, Inco Alloys International, Inc., Research and Development, Huntington, WV

Pages: 13    Published: Jan 1990

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Abstract

Two dynamic and one static technique for determining Young's modulus of mechanically alloyed (MA) materials were evaluated for their suitability for quality control testing and as a tool for development of new MA materials. The dynamic techniques included the commonly used continuously excited free - free beam technique tested in both longitudinal and flexural modes, and the relatively new impulse excitation technique tested in the flexural mode. The dynamic techniques showed a minor difference between the impulse and continuous techniques but still yielded results agreeing within ± 1%. The static technique yielded results differing from -5% to + 7% of the dynamic results. The impulse excitation method is particularly well suited for quality control work, while the continuous method is best for elastic behavior characterization. It is conjectured that the static tensile method accuracy may be adversely affected if the tested material is non-isotropic.