Self accomodating shear strain
Two main contradictory arguments exist concerning the deformation mechanisms of those alloys, i.e., formation of reversible nanodisturbance and reversible martensitic transformation.
Herein we used the in-situ synchrotron high-energy X-ray scattering technique to reveal the novel intrinsic physical origin of all anomalous mechanical properties of the Ti-24Nb-4Zr-8Sn-0.10O alloy, a typical gum-like metal.
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The low energy dislocation structures in microdomains, twin domains and self-accommodating interfaces, causes by martensitic transformations, are evaluated for several B2 alloys with 18R, 9R and 3R martensite structures by the modern theory of martensitic transformations.
The transformations are accomplished by two lattice-variant shears and a volume change relaxation and are one dimensional in origin when the order parameter couples linearly with the spontaneous strain.
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The computed Schmid factors for variants in self-accommodating groups show opposite signs, indicative of a minimum long-range stress field.The martensitic microstructure of shape memory alloy (SMA) is essentially an aggregate of martensite plate groups.It has been shown that the microstructure of Ni-Ti SMA consists of martensite plates clustered in a triangular morphology about the (100)[beta] pole and that of SMA's which transform to 9R, 3R and 2H martensites consist of diamond shaped 4-plate groups clustered about the (110)[beta] pole.Our experiments provide direct evidence on two different kinds of interesting, stress-induced, reversible nanoscale martensitic transitions, i.e., the austenitic regions with B2 structure transform to α″ martensite and those with BCC structure transform to δ martensite.The strong, but less stiffer, metallic materials that exhibit high strength and low elastic modulus have long challenged the intrinsic physical nature of metallic bonds.