Effect of ECAP die angle and route type on the experimental evolution, crystallographic texture, and mechanical properties of pure magnesium

IF 1.5 Q2 ENGINEERING, MULTIDISCIPLINARY

Open Engineering Pub Date : 2023-01-01 DOI:10.1515/eng-2022-0406

A. I. Alateyah

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引用次数: 0

Abstract

Abstract In the current study, the effect of equal channel angular pressing parameters such as die route type and die angle were studied. Billets of pure magnesium (Mg) were processed successfully through up to 2-passes of different routes, A, Bc, and C, using equal channel angular pressing dies with different internal angles of 90° and 120° at 225°C. The crystallographic texture and microstructural evolution were investigated using electron back-scatter diffraction. The Vickers microhardness and tensile properties were investigated, analyzed, and linked to the microstructure and crystallographic texture as well. The as-annealed condition revealed relatively coarse equiaxed grains coupled with some extra-elongated grains with average grain size of 6.338 µm. Processing through 2-passes formed an ultrafine grain structure and recrystallized fine grains. This decrease in grain size was associated with hardness and tensile strength enhancement as compared with the as-annealed Mg counterpart. ECAP processing through the 90° die revealed that 2-passes of route Bc was more effective in grain refinement compared to routes A and C, and it reduced the average grain size by 76.45% compared to the as-annealed counterpart. On the other hand, for the ECAP die with 120°, route A was more effective in grain refinement compared to the other routes. Processing through 2-passes of route C resulted in a stronger texture compared to the other routes with momentous rotation for the texture components. Processing of 2-A, 2-Bc, and 2-C through the 90°-die revealed an increase in the Vickers Hardness (HV) of 76.9, 96, and 84.6%, respectively, compared to the AA counterpart. In addition, the tensile findings revealed that the 90°-die resulted in higher ultimate tensile strength coupled with a drop-in ductility compared to the 120°-die. Furthermore, ECAP processing through the 90°-die led to improvement in the ultimate tensile strength by 14.1, 38.4, and 43.75%, respectively, coupled with improving the Mg ductility by 80.9, 73.5, and 47.6% through processing via 2-A, 2-Bc, and 2-C, respectively, compared to the as-annealed counterpart.

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ECAP模角和路径类型对纯镁的实验演化、晶体织构和力学性能的影响

摘要在本研究中，研究了模具路径类型和模具角度等等通道角挤压参数的影响。纯镁（Mg）坯料在225°C下使用90°和120°不同内角的等通道角压模，通过A、Bc和C这两种不同路线成功加工。利用电子背散射衍射研究了晶体结构和微观结构的演变。研究、分析了维氏显微硬度和拉伸性能，并将其与微观结构和结晶织构联系起来。退火状态显示相对粗糙的等轴晶粒与一些平均晶粒尺寸为6.338的超长晶粒耦合 µm。通过两道工序加工形成了超细晶粒结构并使细晶粒再结晶。与退火后的Mg对应物相比，晶粒尺寸的减小与硬度和拉伸强度的提高有关。通过90°模具的ECAP处理表明，与路线A和C相比，路线Bc的2道次在晶粒细化方面更有效，并且与退火后的对应物相比，其平均晶粒尺寸减小了76.45%。另一方面，对于120°ECAP模具，与其他途径相比，途径A在晶粒细化方面更有效。与纹理成分具有显著旋转的其他路径相比，通过路径C的两个路径进行处理导致更强的纹理。通过90°模具加工2-A、2-Bc和2-C表明，与AA对应物相比，维氏硬度（HV）分别提高了76.9%、96%和84.6%。此外，拉伸结果表明，与120°模具相比，90°模具的极限拉伸强度更高，延展性下降。此外，通过90°模具的ECAP处理使极限抗拉强度分别提高了14.1、38.4和43.75%，同时通过2-A、2-Bc和2-C处理使Mg延展性分别提高了80.9、73.5和47.6%。

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来源期刊

Open Engineering ENGINEERING, MULTIDISCIPLINARY-

CiteScore

3.90

自引率

0.00%

发文量

审稿时长

30 weeks

期刊介绍： Open Engineering publishes research results of wide interest in emerging interdisciplinary and traditional engineering fields, including: electrical and computer engineering, civil and environmental engineering, mechanical and aerospace engineering, material science and engineering. The journal is designed to facilitate the exchange of innovative and interdisciplinary ideas between researchers from different countries. Open Engineering is a peer-reviewed, English language journal. Researchers from non-English speaking regions are provided with free language correction by scientists who are native speakers. Additionally, each published article is widely promoted to researchers working in the same field.