Modeling the flow curves of materials at elevated temperatures is the first step in mathematical simulation of the hot deformation processes of them. In this work a comparative study was provided to examine the capability of three different constitutive equations in modeling the hot deformation flow curves of AZ91 magnesium alloy. For this, the Arrhenius equation with strain dependent constants...

The fast degradation rates in the physiological environment constitute the main limitation for the applications of surgical magnesium alloys as biodegradable hard-tissue implants. In this work, a stable and dense hydrogenated amorphous silicon coating (a-Si:H) with desirable bioactivity is deposited on AZ91 magnesium alloy using magnetron sputtering deposition. Raman spectroscopy and Fourier tr...

Due to their low density, magnesium alloys are very appealing for light-weight constructions. However, the use of most common alloy, AZ91 (Mg 9 wt.% Al, 1 Zn), is limited temperatures below 150 °C due creep failure. Several with an improved resistance have been developed in past, example alloy MRI 230D or Ca-alloyed variants. there ongoing discussion literature regarding mechanisms resistance. ...

Scatter behavior of fatigue life in die-cast AM60B alloy was investigated. For comparison, those in rolled AM60B alloy and die-cast A365-T5 aluminum alloy were also studied. Scatter behavior of pore size was also investigated to discuss dominant factors for fatigue life scatter in die-cast materials. Three-parameter Weibull function was suitable to explain the scatter behavior of both fatigue l...

Abstract Friction stir processing (FSP) was used to modify the surface layer of AZ91 magnesium alloy. The treatment carried out using a jet cooling nozzle, generating stream cold air and enabling intensive friction processed (FSPed) zone. Single-pass FSP tool rotational speed 500 rpm travel 30 mm/min. conducted truncated cone-shaped with threaded side surface. Strong grain refinement microstruc...

In the current study, Twin Parallel Channel Angular Extrusion (TPCAE) as a developed SPD processing technique is used to improve hydrogen storage properties of AZ91 cast alloy. The conducted at different temperatures, ranging from 340 °C down 200 °C. absorption and desorption tests are kinetically three using Sievert-type apparatus. Remarkable improvement in kinetic achieved result TPCAE proces...

(HIPing), can improve the tribo-mechanical properties of cobalt-based alloys. The alloy selected for this investigation had a nominal wt.% composition of Co-30Cr-14W-1C, which is similar to the composition of the commercially available Stellite®4 alloy. The Hot Isostatic Pressed (HIPed) alloy had a much finer microstructure than the cast alloy, which showed a typical hypoeutectic dendritic micr...

Over the years, aluminum content in a vehicle part is increasing due to the needs to reduce weight as well as increase fuel efficiency. Most of the cast product in a vehicle part is mostly cast from A356 alloy. It is used because A356 alloy posses’excellent characteristics over other type of alloy such as cast ability, high weight-to-strength ratio, good corrosion resistance and good weld-abili...

This paper aims to compare the tribo-mechanical properties and structure–property relationships of a wear resistant cobalt-based alloy produced via two different manufacturing routes, namely sand casting and powder consolidation by hot isostatic pressing (HIPing). The alloy had a nominal wt % composition of Co–33Cr–17.5W–2.5C, which is similar to the composition of commercially available Stelli...