Effect of Twist Extrusion Process on the Mechanical Properties and Microstructure Evolution of 70-30 Brass Alloy

Journal of Advanced Materials and Processing

مقاله 5، دوره 6، شماره 4، اسفند 2018، صفحه 33-41   

نوع مقاله: Research Paper

نویسندگان

Sara Hosseini Faregh^{* 1}؛ Amir Hasani²؛ Majid Naseri³

¹Department of Materials Science and Engineering, Faculty of Engineering, Semnan University, Semnan, Iran

²Department of Materials science and Engineering, Faculty of Engineering, Semnan University, Semnan, Iran

³Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

چکیده

In this study, cartridge brass alloy was severely deformed by twist extrusion (TE) technique and its mechanical properties, before and after TE, was investigated using a die with the twist line slope of β = 30°. It was revealed that large strains imposed on the material by this advanced method of severe plastic deformation (SPD) led to a nano-scale ultrafine microstructure and to an enhancement of the mechanical properties. It was revealed that the more TE passes a finer grain sized microstructure obtained. Also, by increasing the number of TE passes, the yield strength and ultimate tensile strength increased. Microhardness test results show that the hardness increases from 55 (initial sample) to 110 HV and 140 HV in the center and lateral edges of the sample pass #1 TE, respectively. After six passes of twist extrusion, the microhardness of the center and lateral edges of the sample reaches 160 HV.

کلیدواژه‌ها

Severe Plastic Deformation؛ Twist Extrusion (TE)؛ Cartridge brass؛ Microstructure Evolution؛ Mechanical Properties