Iranian Journal of Materials Science and Engineering

Highlights

• Different polymeric nanocomposite materials for bumper beam were injection molded.
• Criteria weighting was carried out through AHP and Entropy methods.
• Material selection was performed using TOPSIS and MOORA methods.
• Impact and tensile strengths were the most important criteria.
• PC/ 0.5 wt% nano Al₂O₃ is the most appropriate material for automotive bumper beam.

• In this study the use titanium and tungsten as alternatives to the noble metals in the jewellery industry was investigated.
• Alternate immersion tests were performed in 3.5% sodium chloride and artificial perspiration. The metals’ abrasion resistance with respect to textile fabrics was determined.
• In general, there is around 30% difference in pit density for titanium and tungsten as compared to that of gold. Pit depth and pit diameter showed a similar trend.
• It was found that if titanium and tungsten would be used to manufacture jewellery products, they would have longer maintenance intervals than that of gold.
• New tools and techniques, however, would be required by jewellers to work with titanium and tungsten. 

• The use of short heat treatment cycles to reduce the diffusion of oxygen into the titanium alloy
• Improvement of wear resistance of Ti-grade 5 alloy by changing the microstructure via heat treatment
• Determination of wear micro-mechanism of Ti-grade 5 alloy

•  Oxide films, intentionally created in Zn4Al and ZA27 by the OMO sandwich method, were studied.
•  The thickness of the oxide films in Zn4Al and ZA27 alloys, based on halving the thickness of a fold, is estimated to be within the range of 70-200 nm and 30-100 nm, respectively.
•  Thermodynamic examinations showed that the most stable oxide phase, on the surface of the Zn4Al and ZA27 alloys, is the aluminum oxide.
•  The thickness of the oxide films through kinetic considerations were identical and estimated to be in the range of 2-5 nm, showing the intense effect of turbulent melt flow on the oxidation behavior of cast alloys.

• Multilayered Ag₆Mo₁₀O₃₃ and Ni-substituted one were prepared by mechanochemical.
• Acetamide as driving agent directed solid reaction towards producing rod structure.
• Image processing program showed average diameter of 92 nm for Ag₆Mo₁₀O₃₃.
• The partial substitution of Ag⁺ by nickel unit decreased particle size to 87 nm.
• Ni-substituted sample indicated good photo catalytic ability in water purification.

• The deep rolling process produced a ultrafine-grained layer with increased hardness on the surface of the AISI 316L stainless steel.
• The plasma nitriding at the used conditions generated a hard nitrided layer with further hardness than the deep rolling.
• Deep rolling process combined with plasma nitriding created a thicker nitrided layer with more hardness due to the increased diffusional rapid channels.
• Un-lubricated wear resistance was improved by both the processes particular the plasma nitriding
• Wear resistance at the combined status was found better than the individually processed conditions

• Mo retards the bainitic transformation and enhances the hardenability of the steel.  
• Mo leads to higher fraction of martensite after cooling from isothermal temperature.
• Bainitic microstructure was obtained in the air-cooled Mo-added steel.
• Mechanical properties of the microalloyed steel are improved by Mo addition.