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Effect of arc re-melting on microstructure,mechanical and tribological properties of commercial 390A alloy

Transactions of Nonferrous Metals Society of China 2021年第8期31卷 2264-2276页

作者： ali pasa hekimoglu Merve CaliS Department of Mechanical Engineering Recep Tayyip Erdogan University53100RizeTurkey

To investigate the effect of the arc re-melting on the microstructure,mechanical and tribological properties of the 390 A alloy,its ingot produced by the conventional induction melting method was subjected to the arc re-melting *** microstructure of the 390 A alloy was examined by OM and *** properties of the 390 A alloy were determined by the Brinell method and tensile *** properties were investigated with a ball-on-disc type *** was observed that the microstructure of both conventional induction melted and arc re-melted 390 A alloys consisted ofα(Al),eutectic Al-12 Si,primary silicon particles,θ-CuAl_(2),β-Al_(5) FeSi,δ-Al_(4) FeSi_(2),andα-Al_(15)(FeMnCu)3 Si_(2) ***-melting with the arc process caused grain refinement in these *** addition,after this process,theα(Al)phase and primary silicon particles were dispersed more uniformly,and sharp edges of primary silicon particles became *** arc re-melting process resulted in an increase in the hardness of the 390 A alloy produced by the conventional method from 102 HB to 118 HB and the tensile strength from 130 to 240 *** also caused an increase in the wear resistance of the 390 A alloy and a decrease in the friction coefficient.

关键词： 390A alloy microstructure mechanical properties tribological properties arc melting

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Pyrethroid Insecticide Resistance <i>kdr</i>Gene in the House Fly, <i>Musca domestica</i>(Diptera: Muscidae), in the United Arab Emirates

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Agricultural Sciences 2014年第14期5卷 1522-1526页

作者： Mohammad ali Al-Deeb Biology Department United Arab Emirates University Al-Ain UAE

The house fly, Musca domestica L., is a very important insect because of its role as a vector of several human, livestock, and poultry diseases. Different groups of insecticides, including the pyrethroids, are used to control house flies. The objective of the current study was to conduct a survey of the kdr insecticide resistance gene in the house fly population in the United Arab Emirates (UAE). Flies were collected from five locations (Abu Dhabi, Dubai, Fujairah, Ajman, and Ras Al- Khaymah). Genomic DNA was extracted and polymerase chain reaction (PCR) amplification of specific allele (pasa) was performed. The maximum percentage (70%) of homozygous genotype (kdr/kdr) occurred at Ajman, followed by Dubai (59.5%), and the minimum percentage occurred at Ras Al-Khaymah (14.3%). Resistant insects of the genotype kdr/kdr were detected in all of the tested house fly populations. Ajman and Fujairah house fly populations were in Hardy-Weinberg equilibrium. The resistance kdr allele was found at a high frequency (0.54 - 0.8) at all locations except at Ras Al-Khaymah (0.21). Together, this study demonstrated that the pyrethroid insecticide resistance kdr allele was found in UAE house fly populations, strongly suggesting that a countrywide pyrethroid insecticide resistance management program needs to be implemented.

关键词： House Fly Pyrethroid kdr Resistance UAE

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