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The effect of the relative grain size d/D (d: grain size, D: wire diameter) on stress–strain characteristics was investigated in Cu–Al–Mn-based shape memory alloy (SMA) wires. The yield stress (σ y ), the work-hardening rate after yielding (dσ PE /dε) and the stress hysteresis (Δσ) in the wires with a random texture decrease with increasing d/D. The transformation strain (ε TS...
Magnetic domain structures in recently developed Co-Ni-Al ferromagnetic shape memory alloys were examined by Lorentz microscopy and electron holography, and relations of the martensite variants (crystallographic domains) and the magnetic domains were discussed. Direct observations of the magnetic domain walls by Lorentz microscopy and the magnetic lines of force by electron holography revealed that...
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