Purpose: This study aims to investigate the structural, mechanical, thermal and electrical properties of tin–silver–nickel (Sn-Ag-Ni) melt-spun solder alloys. So, it aims to improve the mechanical properties of the eutectic tin–silver (Sn-Ag) such as tensile strength, plasticity and creep resistance by adding different concentrations of Ni content.Design/methodology/approach: Ternary melt-spun Sn-Ag-Ni alloys were investigated using x-ray diffractions, scanning electron microscope, dynamic resonance technique (DRT), Instron machine, Vickers hardness tester and differential scanning calorimetry.Findings: The results revealed that the Ni additions 0.1, 0.3, 0.5, 0.7, 1, 3 and 5 Wt.% to the eutectic Sn-Ag melt-spun solder were added. The “0.3wt.%” of Ni was significantly improved its mechanical properties to efficiently serve under high strain rate applications. Moreover, the uniform distribution of Ag₃Sn intermetallic compound with “0.3wt.%” of Ni offered the potential benefits, such as high strength, good plasticity consequently and good mechanical performance through a lack of dislocations and microvoids. The tensile results showed improvement in 17.63 per cent tensile strength (26 MPa), 21 per cent toughness (1001 J/m³), 22.83 per cent critical shear stress (25.074 MPa) and 11 per cent thermal diffusivity (2.065 × 10⁻⁷m²/s) when compared with the tensile strength (21.416 MPa), toughness (790 J/m³), critical shear stress (19.348 MPa) and thermal diffusivity (1.487 × 10⁻⁷m²/s) of the eutectic Sn-Ag. Slight increments have been shown for the melting temperature of Sn_96.2-Ag_3.5-Ni_0.3(222.62°C) and electrical resistivity to (1.612 × 10⁻⁷Ω.m). It can be said that the eutectic Sn-Ag solder alloy has been mechanically improved with “0.3wt.%” of Ni to become a suitable alloy for high strain rate applications. The dislocation movement deformation mechanism (n= 4.5) without Ni additions changed to grain boundary sliding deformation mechanism (n= 3.5) with Ni additions. On the other hand, the elastic modulus, creep rate and strain rate sensitivity with “0.3wt.%” of Ni have been decreased. The optimum Ni-doped concentration is “0.7wt.%” of Ni in terms of refined microstructure, electrical resistivity, Young’s Modulus, bulk modulus, shear modulus, thermal diffusivity, maximum shear stress, tensile strength and average creep rate.Originality/value: This study provides nickel effects on the structural of the eutectic Sn-Ag rapidly solidified by melt-spinning technique. In this paper, the authors have compared the elastic modulus of the melt-spun compositions which has been resulted from the tensile strength tester with these results from the DRT for the first time to best of the authors’ knowledge. This paper presents new improvements in mechanical and electrical performance.

The Ni-Al ferrite nanoparticles are synthesized by the flash auto-combustion method, and PANI is synthesized by the situ-chemical oxidative polymerization method. NiAl-ferrite/PANI/ x (PANI) Nanocomposite Films (x = 0.6 and 0.8) were prepared using a solution casting process. The X-ray results of the NiAl_xFe_2-xO₄/PANI composite manifest that the Ni-Al ferrite fully interacted with PANI molecules and the Ni-Al ferrite particles are embedded in the PANI chains from TEM and SEM images. The dielectric parameters ϵ′, ϵ″ and tan δ decreased with the increase in the frequency of the applied field. The modulus M″ spectra of the investigated samples show two relaxation peaks in two frequency regions. In Cole–Cole plot of M′ versus M″, a semicircular trend is observed, i.e. a non-Debye criterion. The presence of PANI in the NiAl_0.6Fe_1.4O₄/PANI composite films reduces the magnetic properties of the composite samples leading to the decrease of saturation magnetization and remanence magnetization.

This work is carried out for the development of radiation shielding block alloys (bismuth based) for radiation therapy. Two different bismuth alloys whose composition, first, Bi-40 wt.% Pb-20 wt.% Sn and secondly, Bi-40 wt.% Pb-10 wt.% Sn-10 wt.% Cd are known as low melting temperature alloys (named fusible alloys). These alloys are used for the protection of vital critical organs inside the radiated area during radiotherapy applications. Structure, mechanical properties, and radiation shielding parameters of prepared alloys by conventional and rapid quench from molten state using the melt-spun technique have been studied and analyzed. It is concluded that from x-ray diffraction analysis, the presence of a new metastable crystalline phase (hexagonal structure a = 3.505, b = 3.505 and c = 5.795 nm) called Pb₇Bi₃ is detected. The formation of a metastable crystalline phase Pb₇Bi₃ causes the enhancement of mechanical properties. It is also concluded that the bismuth alloy which is cadmium-free exhibits superior microhardness compared to bismuth alloy containing cadmium. The measurements of radiation parameters were taken using ⁶⁰Co and 6 MV. X-ray shows that alloy-free Cd has good attenuation coefficient, good mechanical characteristics, Vickers microhardness and moderate melting temperature. We can easily synthesise the bismuth alloy cadmium-free into suitable shapes in addition to it being friendly to the environment (green environment), so that they may be used as a substitute candidate instead of bismuth alloy containing Cd to use in radiation therapy.