Low frequency damping properties of Cu–Al–Be alloy during the phase transformation

Mechanical resonance of the austenite/martensite interface and the pinning of the martensitic microstructures by dislocations inCu74.08Al23.13Be2.79<

“…Two types of stressinduced interfacial properties commonly dominate the behavior of martensites. [3][4][5][6][7][8][9][10][11][12][13] First, the phase front between coexisting austenite and martensite regions in a sample are generally mobile. The location of the phase front depends sensitively on thermal gradients, boundary conditions, and defect configurations.…”

“…The location of the phase front depends sensitively on thermal gradients, boundary conditions, and defect configurations. Song et al 9,14 have carefully examined the friction properties of the phase front between the austenite and martensite regions of the sample with similar composition. We will argue that their results are fully confirmed by our experiments using a different experimental technique; their analysis of the aging properties is also in agreement with our observations.…”

Young's modulus and damping capacity of Ti 3 Sn intermetallic compound with 1 at% and 3 at% of Zr and Al additions

“…This additional peak was observed in other SMA [10][11][12][13] and is proposed to be due to thermally activated unpinning of twins' boundaries. However in the case of Ti 75,5 Sn 24,5 peak Q 2 is essentially more pronounced than in [11][12][13][14] and accompanied by of change in slope of temperature dependence of Young's modulus therefore peak Q 2 could evidence the occurrence of another phase transformation. As can be seen in Fig.3b, peak Q 2 decreases significantly, peak Q 1 decreases slightly and both peaks shift toward lower temperature during second thermal cycle.…”

“…During martensitic transformation, most of the energy is dissipated due to the movement of martensite/parent interfaces, which causes a peak of damping capacity to appear in the Measurements of damping capacity has revealed another well-defined peak (Q 2 ) around 240 K. This peak corresponds to the less apparent change in slope of Young's modulus curve versus temperature and has been observed in Ti 3 Sn by dynamical mechanical analysis previously [1,4,8]. This additional peak was observed in other SMA [10][11][12][13] and is proposed to be due to thermally activated unpinning of twins' boundaries. However in the case of Ti 75,5 Sn 24,5 peak Q 2 is essentially more pronounced than in [11][12][13][14] and accompanied by of change in slope of temperature dependence of Young's modulus therefore peak Q 2 could evidence the occurrence of another phase transformation.…”

Zener relaxation peak in a Cu–Al–Mn shape memory alloy

“…Thermo-elastic martensitic transformation (MT) is one of the most important features of this alloy system and has been extensively studied in the last decade [1][2][3][4][5]. Cu -Al -Mn SMA is a potential candidate in a number of engineering applications due to its excellent damping property and relatively high transition temperature [6 -8].…”