Non-isothermal crystallization kinetics of a rapidly solidified as-cast TiZrHfNiCu high entropy bulk metallic glass

This paper aims to investigate the thermal behavior and crystallization kinetics of TiZrHfNiCu high entropy bulk metallic glass (HE-BMG) alloy using the standard procedure of Differential Scanning Calorimetric (DSC) annealing technique. The alloy was produced using an arc melting machine with a critical diameter of 1.5 mm. The crystallization kinetics and phase transformation mechanism of TiZrHfNiCu HE-BMG was investigated under the isochronal condition at a single heating run based on the Johnson-Mehl- Avrami (JMA) theory. In isochronal heating, the apparent activation energy for glass transition and crystallization events was analyzed by Kissinger and Ozawa methods. The average activation energy value for crystallization of TiZrHfNiCu amorphous alloys in isochronal modes was 226.41 kJ/mol for the first crystallization and 297.72 kJ/mol for second crystallization stages. The crystallization mechanism of the first step was dominated by two- and three-dimensional growth with increasing nucleation rate, while the crystallization mechanism in the second stage was dominated by two-dimensional crystallization growth with a constant nucleation rate. The diffusion mechanism result proved the theory of sluggish atomic diffusion of HEA at elevated temperature

De’villa ventures : G-socks / Muhammad Syazwan Mohd Azi... [et al.]

This strategic agreement shows a diagram of business portrayal, exercises and objectives inside three years anticipating business period Our mission is to sell a socks that can make customers feel comfort when wear it in a long time The customers that we target are kids, teenagers, and adult. Our product comes with various size from small to large

Numerical analysis on deformation behavior of High Entropy Alloy (HEA) under compression test

The mechanical properties of a material reflect the relationship between its response to or deformation from an applied load or force. It determines the range of usefulness of a material and establishes the service life that can be expected. The importance of mechanical properties includes strength, hardness, ductility and stiffness. These properties are ascertained by performing carelully designed laboratory experiments that replicate as closely as possible the service conditions. The introduction to novel high entropy alloys (HEAs) which consists of multicomponent elements have been attracting considerable attention all over the world, particularly in the recent years. HEAs reported to exhibit exceptional mechanical properties at various conditions of surrounding and expected to be applied in engineering application. This paper discusses the mechanical properties of FeCoNiAIBSi HEA under compression condition with increasing of boron content. The deformation behaviour during this condition of the FIEA was analysed numericaily by using LS-Dyna software. The piecewise linear plasticity material model was used to investigate the deformation of the HEA. An inverse finite element method was introduced to determine the optimum friction properties of each model. Increasing of friction coefficient was proven to increase the strength of the material. The validation on the numerical analysis was done by comparing the simulated stress-strain curve and geometry with the experimental value for each HEA sample. The deformation behavior was discussed through the morphology analysis of the samples. It was found that increase in boron content changed the structure of the FIEA and thus altered its mechanical properties

Methyl orange adsorption from aqueous solution by corn cob based activated carbon

Water is essential to the ecosystem for the energy required to stay alive. Nowadays, rapid development in technology can cause pollution to the environment such as water quality pollution and then faced by society. A dangerous source in wastewater such as dyes poses a severe problem due to its toxicity and it was hard to treat. Based on the adsorption ability, activated carbon from corn cob was made for the removal of dyes in wastewater treatment. Activated carbon from corn cob was developed by using alkaline solution treatment of potassium hydroxide (KOH) with different mass ratios, and then was characterized by FTIR, XRD, and SEM. The synthesized activated carbon was also used for removal of methyl orange from aqueous solution. In this research, the obtained char yield after pre-carbonization at 500 °C was 74.20%, while activated carbon yields were 53.60% to 78.80%, based on its difference mass ratios of KOH. The activated carbon without an activation agent gave adsorption capacities of 14.63%. However, when the char was introduced to KOH, the adsorption was increased from 41.09% to 80.36%. The percentage of dye removal increased when the mass ratios of KOH increased. The produce activated carbon from corn cob by using KOH can be effectively used for wastewater treatment