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      저자 : Moslem Tayyebi (검색결과 1 건)
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        Microstructure, Texture and Tensile Properties of Nickel/Titanium Laminated Composites Produced by Cross Accumulative Roll Bonding Process

        Shoufa Liu,Moslem Tayyebi,Amir Hossein Assari,Adelajda Polkowska,Sebastian Lech,Wojciech Polkowski 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.12

        The purpose of this paper is to examine the microstructural evolution and mechanical properties of Ni/Ti laminatedcomposite produced by a cross-accumulative roll bonding (CARB) method. The SEM images showed that no void anddelamination were observed which indicates that the layers were strongly bonded together. In addition to the thicknessreduction and increased number of interfaces, plastic instabilities took place with an increase in CARB passes; the wavylikeinterfaces appeared as a result of the necking and shear bands formation. However, due to the effect of uniform rollingpressure and rotation of rolling direction during the CARB process, all layers remained continuous in all CARB passes. The most marked observation coming from EBSD analyses was the formation of fine grains surrounded by a high fractionof high-angle grain boundaries (HAGBs). Based on the microtexture analyses on Ti and Ni layers, it was found that byincreasing the rolling passes, a crystallographic texture formed in Ti layers gradually changes from the basic {0001}<112̅0 > system into the system dominated by {0001}<101 ̅0 > prismatic-like orientations. In the case of the crystallographictexture formed in Ni layers, there was a significant increase in the intensity of the Q{013}<231>; P{011}<122 > andGoss {011}<100>, indicating the formation of shear strain-assisted type of texture. Furthermore, with an increase in theCARB passes, the mechanical properties improved due to strong interfaces and grain refinement. The maximum values ofthe yield strength, tensile strength, and elongation reached 842 MPa, 936 MPa, and 7.1% respectively, in the final CARBpass. In addition, ductile fracture mainly occurred on fracture surfaces of Ti and Ni layers even though by increasingpasses, cleavage facets appeared due to strain hardening.

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