Abstract
The objective of this work was to investigate the relationships between process and microstructure and property in polycrystalline Ni47Ti44Nb9 alloy. Three processes: (1) hot-forged, (2) cold-drawn, and (3) cold-rolled were investigated. The microstructure was tested by means of optical microscope, x-ray diffraction, and electron backscatter diffraction, and then crystalline orientation distribution functions and inverse pole figures were measured. The results indicated that hot-forging eliminated dendritic microstructure and fined the eutectic structure. It also induced a 〈113〉 fiber texture, which paralleled to the axial direction. The cold drawing and cold-rolling had a further effect in grain refinement. And the cold-drawn specimens contained a strong 〈111〉 fiber texture paralleling to the deformation direction, while the cold-rolled tubes formed 〈111〉 crystalline directions paralleling the axial direction and 〈110〉 crystalline directions of crystalline arranged along the circumferential direction. The notably distinctive recoverability of different processed materials was observed and discussed.
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