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The damping capacity of Ni–Mn–Ga–Gd films annealed for different durations has been investigated by dynamic mechanical analysis (DMA) measurement. The DMA results show that the internal friction peaks are absent in the IF curves, due to very low transformation rate and low transformation strain in the films. With the increase of annealing time, the value of tan delta in martensite first increases...
Thermal stability and shape memory effect (SME) of Ni-Mn-Ga-based thin film were firstly investigated. The fluctuation scope of phase transformation temperatures did not exceed 2 °C during 100 thermal cycles. The maximum SME of 0.64% was quantitatively measured under 600 MPa applied stress. SME almost kept constant after 20 times thermal cycling deformation under 300 MPa applied stress.
ZnO/graphene composite thin film was deposited through a sol-gel process. The thin film crystal structure was characterized by XRD, the result showed that the presence of graphene did not destroy the crystal structure of ZnO. The optical spectrum showed that the introduction of graphene into ZnO did not bring an obvious effects on optical properties. To further investigate the thin film properties,...
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