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Joining of AA2014 and AA5059 dissimilar aluminium alloys by Friction Stir Welding

100%

Saleh A. A.

tom Vol. 97, nr 1

15--20

Purpose: This work aims to investigate the microstructure and mechanical properties achieved by FSW of butt joints, namely of dissimilar sheets namely of 2014-T3 to 5059-H11 Al alloys by bonding the two materials perpendicular to their rolling directions. Design/methodology/approach: AA 2014T3 and AA 5059H11 were two dissimilar aluminium alloys friction stir welded. The joint has been examined in terms of hardness, microstructure, and mechanical properties. The microstructure of the weld area was characterized by using optical microscopy. Seven diverse regions of the microstructure in the joint can be illustrious. Findings: It has been noticed that a structure of fine grain is formed in the nugget region as a consequence of recrystallization. The thermos mechanically affected and heat affected zones of aluminium alloy 2014 are characterized by the lowest hardness values in spite of there are a general hardness decrease through the weld zone compared to both base metals. The ultimate tensile strength values of the dissimilar joint were found to be varying between 54% to 66% those of the base metal. Research limitations/implications: The t joining in FSW takes place with the base materials remnant in the solid state, which gives a considerable possibility to produce joints between the alleged difficult-to-weld heat treatable aluminium alloys. Originality/value: The outcomes display that friction stir welding can be effectively applied for the joining of dissimilar aluminium alloys.

Effect of dietary mixture of Aspergillus probiotic and selenium nano-particles on growth, nutrient digestibilities, selected blood parameters and muscle fatty acid profile in broiler chickens

100%

Saleh A. A.

nr 1

Forty five chickens (15 days old) were assigned to three groups: (1) control group fed a basal diet;group (2) fed the basal diet supplemented with 0.05% Aspergillus awamori and group (3) fed mixture of A. awamori 0.05% + selenium nano-particles 0.3%. Chickens were allowed free access to feed and raised for 12 days. Body weight gain and breast muscle weight increased in group 2 and 3 when compared to the control. Plasma 3-methylhistidine concentration occurred lower in group 2 and 3 Plasma triglyceride and total cholesterol were decreased by feeding A. awamori and the combination of A. awamori with selenium nano-particles. Fat content of the breast muscle increased accompanied by decrease of saturated fatty acids (SFAs) and increase of unsaturated fatty acids (UFAs). Moreover,decreased muscle TBARS and increased α-tocopherol contents in the breast muscle was observed in both experimental groups. The mRNAs of FAS, GPX and delta-6 desaturase were increased by feeding A. awamori and the combination of A. awamori with selenium nano-particles. In conclusion,it is suggested that feeding A. awamori alone or its combination with selenium nano-particles may improve growth performance, modify the skeletal muscle fatty acid profile and α-tocopherol content,suggesting that they may improve meat quality.

Physical properties of neodymium tin oxide pyrochlore ceramics

51%

Saleh A. A. , Qasrawi A. F. , Yumusak G. , Mergen A.

Materials Science Poland

2017

tom Vol. 35, No. 3

534--538

In this work, physical properties of neodymium tin oxide pyrochlore ceramics prepared by solid state reaction technique are investigated by means of X-ray diffraction, scanning electron microscopy, ultraviolet-visible light (UV-Vis) spectrophotometry and temperature dependent electrical resistivity measurements. The pyrochlore is observed to have a cubic FCC crystal lattice with lattice parameter of 10.578 A. The planes of the cubic cell are best oriented in the [2 2 2] direction. From the X-ray, the UV-Vis spectrophotometry and the electrical resistivity data analysis, the grain size, strain, dislocation density, optical and thermal energy band gaps, localized energy band tail states and resistivity activation energies are determined and discussed. The pyrochlore is observed to have an optical energy band gap of ∼3.40 eV. This value corresponds to 365 nm UV light spectra which nominates the neodymium tin oxide pyrochlore ceramics for the use as UV sensors.