فهرس المقالات Twist extrusion

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  1 - Effect of Twist Extrusion Process on the Mechanical Properties and Microstructure Evolution of 70-30 Brass Alloy
  Sara Hosseini Faregh Amir Hasani Majid Naseri
  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 أکثر

  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. تفاصيل المقالة
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  2 - An Upper Bound Solution for Analysis of Twist Extrusion Process with Elliptical Die Cross-section
  یاسر میرباقری حامد معصومی مجید سیدصالحی
  Twist extrusion process is a rather new route to produce highly strained materials. In this process, severe plastic deformation is applied by large shear strains. In current article, required energy for twist extrusion by use of admissible velocity field together with t أکثر

  Twist extrusion process is a rather new route to produce highly strained materials. In this process, severe plastic deformation is applied by large shear strains. In current article, required energy for twist extrusion by use of admissible velocity field together with the upper bound technique is predicted. The proposed model is capable of considering the effect of various parameters such as die geometry and friction conditions. In addition, the model anticipates the critical die design parameters. To verify the proposed model, the predictions were compared with the results of a finite-element analysis and reasonable consistency was observed. تفاصيل المقالة