Determination of the Young´s modulus in CuAlBe shape memory alloys with different microstructures by impulse excitation technique

S. MONTECINOS; S. TOGNANA; W. SALGUEIRO

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2016 vol. 676 p. 121 - 127

0921-5093

The Young´s modulus (E) was determined in samples of CuAlBe shape memory alloys with selected grain sizes using the non-destructivetechnique of impulse excitation. The variation of E with the quenching temperature reached after a slow cooling from1073 K was also studied and the microstructure of quenched samples was characterizedby optical microscopy. A strong dependence of E with the grain size was found and a comparison of the obtainedresults with values reported in the literature was done. The behavior of E with the quenching temperature wasanalyzed considering the formation of γ2 and α´ precipitates, thepresence of martensite in the β matrix, the reordering process and the vacancy concentration.The impulse excitation experimental device was specifically developed andmounted. An evaluation of its performance was made by means of measurements ofthe modulus E in samples of materialscommonly used (commercial aluminum and copper) and using different vibrationmodes. The obtained results evidence the potentialities of the impulseexcitation technique for the determination of the modulus E in alloys with a complex microstructure, which allows to characterizethe behavior of E with the quenchingtemperature in the alloy studied.