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Vol.36, No.11, 1922 ~ 1928, 1998

Title

Joint - Syposium on Fine - Grained Materials by the Phase Transformation Committee ( Eighth ) and the Ferrous Metallurgy Committee ( Second ) : Grain Growth and Modeling ; Texture Change and Its Application Due to Martensitic Phase Transformation in CuZnA

박노진 No Jin Park

Abstract

The shape memory effects of CuZnAl shape memory alloys are based on martensitic phase transformation from a high-symmetrical austenite (cubic crystal symmetry) to low-symmetrical martensite (orthorhombic or monoclinic crystal symmetry) and back, whereby a distinctive crystallographic orientation relationship between austenite and martensite exist. If this phase transformation takes place in a polycrystalline material with a particular texture, then the martensitic phase inherits a texture from the starting austenite texture. Therefore the crystallographic orientation relationship between both phases can be determined by the austenite texture and the martensite texture. The austenite texture of a extruded and hot-rolled Cu-14.2wt.%Zn-8.5wt.%Al-0.5wt.%Ti sheet was measured at 115℃ and the martensite texture at RT. With the measured texture of the martensitic and austenitic state the crystallographic orientation relationship was determined. The pseudoelastic property (shape memory effect) and the Young`s modulus were calculated with the measured austenite texture and with the calculated austenitic texture from the martensite texture using the texture transformation.

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