Search

In the present study, the wear resistance behavior and the microhardness of the Co38Ni35Al27 and Co35Zn10Ni32Al23 ferromagnetic shape memory alloys (FSMAs) were investigated. The alloy samples were prepared by powder metallurgy method along with the vacuum sintering technique. The major aim is to prepare an alloy with high wear resistance having remarkable microhardness suitable for the sustainable shape memory alloy. The wear test report shows that the wear resistance is high for the sample sintered at 673 K and it gradually reduces when the sintering temperature decreases. The result also shows that the inclusion of zinc in the alloy increases the wear rate. The maximum hardness value of 126 HV was observed in Co38Ni35Al27 sample sintered at 673 K for 8 hrs because of its minimal porosity.

In this work “solve two problems with one single action” strategy was implemented for degradation of industrial dye Amaranth and enhanced blue-green emission for opto-electronics applications in Cu2+ doped ZnO materials. The different concentrations (weight (wt) %) of Cu2+ doped ZnO materials have been synthesized by the thermal spreading method. The as-prepared ZnO and Cu2+ doped ZnO materials have effectively confirmed by various spectroscopic methods. The crystalline phase, surface morphology, compositions of elements and energy bandgap were studied systematically enquired by PXRD, SEM, EDS and UV-vis spectroscopic analysis, respectively. With the dopant concentration, 18 wt% of Cu2+ doped ZnO revealed outstanding photocatalytic performance to the degradation of Amaranth under visible light irradiation with an efficacy of about 97%. Likewise, 18 wt% of Cu2+ doped ZnO shows an strong blue-green emission at around 495 nm owing to the internal oxygen vacancies. The present work gives some clue; it may be used as a proficient photocatalyst for degradation of dyes and luminescent material for optoelectronics applications.

Co-Ni-Al alloy samples were prepared by compacting the powdered alloy at various pressures in proper stoichiometric ratio and the high density compacted alloy was sintered at 673 K. The magnetic, mechanical properties, microstructure and phase analysis were studied and compared with that of spark plasma sintered (SPS) alloy. The sintered alloy exhibit martensitic twin variants with ? phase structure. Along with the diffused particle, few agglomerated clusters were observed on the topographic images. The magnetic and the mechanical studies of the test specimens were investigated using the vibrating sample magnetometer, pin on disk tribometer and universal testing machine respectively. The coercivity value and the ductility of the SPS alloy are higher than the same of the as-sintered alloy.