Microstructure, mechanical properties and machinability of Cu–Zn–Mg and Cu–Zn–Sb brass alloys

Abstract

Lead-free alloys have attracted great attentions recently due to the toxic nature of lead for the human body. In this study, low amounts of Mg and Sb were added to the Cu65–Zn35 brass and microstructure, mechanical properties and machinability of samples were compared to Cu65–Zn35 brass. Both Mg and Sb led to the promotion of β′ phase as well as the formation of new ternary copper rich intermetallic particles. It was found that these particles had a significant role in the reduction of the ultimate tensile strength, toughness, work hardening and elongation while increasing the hardness of samples. Results of machinability evaluation of samples showed that the cutting forces were decreased significantly and morphology of chips were improved compared to Cu65–Zn35 brass sample.

Co-TiO2 Nanoparticles as the Reinforcement for Fe Soft Magnetic Composites with Enhanced Mechanical and Magnetic Properties via Pulse Electrodeposition

“…To investigate the surface characteristics, including chemical composition and morphology field emission scanning electron microscopy (FESEM, Hitachi S4160 model) equipped with the EDX point chemical Analyzer were used [8][9][10]. The phase analyses of Fe-Co-TiO2 films were done by XRD technique (Philips, X'pert-MPD system by Cu-Kα).…”

“…In confirmation of the EDX results, the XRD analysis of samples was also performed. Moreover, in spite of EDX limitations, the usage of this analysis is very common in phase analysis [8][9][10].…”

“…Pulse electroplating can effectively modify this process [9]. According to the literature, various attempts were carried out to compensate and enhanced the hardness of these coatings by adding oxide nanoparticles or usages of pulse current with respect to the direct current through the preparation of composite coatings [10]. In pulse electrodeposition, the current includes two modes that the layer charges through on-time and discharges somewhat through offtime.…”

A hybrid approach based on artificial neural network and cuckoo algorithm for optimization of the main cutting force during turning of Si brass alloys

“…In this study, the content of Cu, Zn and Si as well as the CS, FR and DoC were considered as the input variables while; the main cutting force was selected as output variable. The ranges of the input parameters were selected based on the results obtained in literatures [8,24]. From 92 repeatable experimental data sets, 69 tests were selected for training and 23 for testing the network in a random way.…”

“…Formation of brittle phases was reported to be a major cause of the machinability improvement. Adineh et al [8] represented that not only the presence of brittle phases but also the morphology and hardness of the phases involved had significant role on decreasing the main cutting force of Si brass alloys.…”