Abstract. Forming components of titanium alloys via superplastic forming at elevated temperatures while being exposed to oxygen leads surface oxidation. The hard oxide layer formed on the is referred as alpha case. This case requires post-form processing remove it, thus increasing overall manufacturing costs and times. Superplastic lower can significantly reduce formation has other benefits, su...

The effects of Mg content and cooling rate on the T5 treatment Al-Si-Mg alloys have been investigated using Avrami kinetics transmission electron microscopy. were super-heated at 800 oC for 1 hr followed by degassing 720 15 min, poured into a metallic mold preheated to 250 oC. as-cast then T5-treated temperature 190 As and/or increased, strength increased while elongation decreased over entire ...

This article presents the results of studying temperature distribution in process thermo-frictional cutting titanium alloy Ti-5553. The was simulated using Machining module DEFORM 3D software package based on finite element method. It found that when off Ti-5553, depending geometry circular saw, "disk-workpiece" contact zone reached T = 800 ÷ 1130 °C, and its propagation into depth workpiece 0....

The effect of Co:Ni ratio on the oxidation performance ?-?? alloys based (Ni,Co)75Al5Ti5Cr15 system (at.%) was investigated. Seven model superalloys Co concentration 0, 9, 19, 28, 38, 47 and 56 at.% underwent isothermal in air at 800 °C using both box-furnace exposure (1000 h) thermogravimetric analysis (100 h). Following 1000 h °C, containing 38 exhibited a flatter, more compact external scale...

The current work seeks to discover and choose the proper friction stir processing (FSP) settings for aluminum alloy 7075 surface composites enhanced by adding three unique nanoparticles of titanium dioxide (TiO2), B4C, graphene superior performance. FSP is only method that produces higher amounts particle distribution nanoscale reinforcing. For sample fabrication, a special relatively high rota...

Intermetallic alloy is a combination consists of two metal compounds or more. One intermetallic that can be used nickel. Nickel corrosion resistant and withstands high temperature. for application on aircraft components such as turbin gas engine operate in temperature extreme environment. This study conducted to find out the changes micro structure hardness NiAlTi material added by germanium 1,...

objectives: micromechanical retention of resin cements to alloys is an important factor affecting the longevity of metal base restorations. this study aimed to compare the bond strength and etching pattern of a newly introduced experimental etchant gel namely nano met etch with those of conventional surface treatment techniques for nickel-chrome (ni-cr) and high noble alloys.  materials and met...

A new, white Leucoagaricus species is described from central California. Leucoagaricus amanitoides is characterized by a volvate, short and bulbous stipe, long narrowly clavate cystidia and ellipsoid spores without a germ pore.

(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...