Startseite Microstructure and mechanical properties of AZ31 Mg alloy produced by a new compound extrusion technique
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Microstructure and mechanical properties of AZ31 Mg alloy produced by a new compound extrusion technique

  • Liwei Lu , Zhenru Yin , Jun Zhao , Dongfeng Shi und Chuming Li
Veröffentlicht/Copyright: 26. September 2018
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Materials Testing
Aus der Zeitschrift Materials Testing Band 60 Heft 10

Abstract

A new extrusion technique, integrated dual-directional extrusion and spiral deformation(DDES), is proposed and successfully applied to AZ31 Mg alloys with no cracks present in the alloys. Combining finite-element analytic, optical microscopy, and X-ray diffraction techniques, it is found that the DDES process may cause cumulative strains of 1.88 in Mg alloy billet. The average grain size of the alloys can be refined from 300 μm to 3.5 μm at a temperature of 573 K, and the basal texture is also dramatically weakened from 53.6 to 6.52. These improvements are mainly attributed to dynamic recrystallization induced by heavily accumulated strain at the spiral region. Further compressive tests are carried out on processed AZ31 Mg alloys, and the superior compressive strength and fracture strain can attain 395 MPa and 30.6 %, respectively, rendering this new deformation technique into a promising approach for further governing properties of Mg-based alloys.

Kurzfassung

In dem vorliegenden Beitrag wird eine neue Extrusionstechnik, eine integrierte zweigerichtete Extrusion und Spiralverformung, vorgestellt und an Magnesiumlegierungen des Typs AZ 31 angewandt, wobei diese Technik keine Risse hervorrief. Mittels Finite-Elemente-Analysen, Lichtmikroskopie und Röntgendiffraktometrie stellte sich heraus, dass der DDES-Prozess kumulative Dehnungen von 1,88 in den Magnesiumcoupons hervorrufen kann, die durchschnittliche Korngröße von 300 auf 3,5 μm bei einer Temperatur von 573 K reduziert werden kann und dass die grundlegende Textur ebenso dramatisch abnimmt, nämlich von 53,6 auf 6,52, was auf die dynamische Rekristallisation zurückgeführt werden kann, die durch die hochgradig akkumulierten Dehnungen in den Regionen der Spirale zurückgeführt werden kann. Darüber hinaus wurden Druckversuche mit den so hergestellten AZ31 Magnesiumlegierungen durchgeführt, wobei die hervorragende Druckfestigkeit und Bruchdehnung entsprechend auf 395 MPa und 30,6 % erhöhen, was diese neue Verformungstechnik als einen vielversprechenden Ansatz für die weitere Kontrolle der Eigenschaften von Magnesiumlegierungen erscheinen lässt.

*Correspondence Address, Associate Prof. Dr. Liwei Lu, Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material, Hunan University of Science and Technology, Xiangtan, Hunan 411201, P. R. China, E-mail:

Assoc. Prof. Li-Wei Lu received his BSc degree from Hunan University of Technology, Zhuzhou City, Hunan Province, China in 2006 and his MSc and PhD degrees from Chongqing University, China in 2012. Currently, he is Associate Professor at Hunan University of Science and Technology, Xiangtan, China.

Zhenru Yin, Jun Zhao and Dongfeng Shi are research assistants at Hunan University of Science and Technology, Xiangtan, China.

Prof. Chuming Liu is Professor at College of Material Science and Engineering, Central South University, Changsha, China. He received his PhD from Central South University, China in 2007. His research interests include wrought magnesium alloys.

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Published Online: 2018-09-26
Published in Print: 2018-10-27

© 2018, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Inhalt/Contents
  2. Contents
  3. Laudatio
  4. Professor Dr.-Ing. Harald Zenner: on the occasion of his eightieth birthday
  5. Fachbeiträge/Technical Contributions
  6. Fatigue life curve – A continuous Wöhler curve from LCF to VHCF
  7. On the accuracy of estimating fatigue notch factors
  8. Analytical strength assessments of austempered ductile iron components
  9. On the estimation of cyclic material properties – Part 1: Quality of known estimation methods
  10. On the estimation of cyclic material properties – Part 2: Introduction of a new estimation method
  11. Execution and evaluation of cyclic tests at constant load amplitudes – DIN 50100:2016
  12. Wear resistance of laser cladded Stellite 31 coating on AISI 316L steel
  13. Determination of the Johnson-Cook damage parameter D4 by Charpy impact testing
  14. Effect of residual Alclad on friction stir spot welds of AA2219 alloys
  15. Effect of cooling rate on microstructure, mechanical properties and residual stress of 7075 aluminum alloy
  16. Failure analysis of an adhesively joined composite pipe system under internal pressure
  17. Non-metallic inclusions and fatigue strength of steel 34CrNiMo6
  18. Untersuchungen des Schädigungsgrades von Polyethylenformstoffen als Werkstoffe von Heizöllagerbehältern nach einer Nutzungsdauer von über 30 Jahren
  19. Microstructure and mechanical properties of AZ31 Mg alloy produced by a new compound extrusion technique
  20. Failure analysis of a cracked Q125 casing for ultra-deep wells at the Tarim Oilfield
https://doi.org/10.3139/120.111244

Artikel in diesem Heft

  1. Inhalt/Contents
  2. Contents
  3. Laudatio
  4. Professor Dr.-Ing. Harald Zenner: on the occasion of his eightieth birthday
  5. Fachbeiträge/Technical Contributions
  6. Fatigue life curve – A continuous Wöhler curve from LCF to VHCF
  7. On the accuracy of estimating fatigue notch factors
  8. Analytical strength assessments of austempered ductile iron components
  9. On the estimation of cyclic material properties – Part 1: Quality of known estimation methods
  10. On the estimation of cyclic material properties – Part 2: Introduction of a new estimation method
  11. Execution and evaluation of cyclic tests at constant load amplitudes – DIN 50100:2016
  12. Wear resistance of laser cladded Stellite 31 coating on AISI 316L steel
  13. Determination of the Johnson-Cook damage parameter D4 by Charpy impact testing
  14. Effect of residual Alclad on friction stir spot welds of AA2219 alloys
  15. Effect of cooling rate on microstructure, mechanical properties and residual stress of 7075 aluminum alloy
  16. Failure analysis of an adhesively joined composite pipe system under internal pressure
  17. Non-metallic inclusions and fatigue strength of steel 34CrNiMo6
  18. Untersuchungen des Schädigungsgrades von Polyethylenformstoffen als Werkstoffe von Heizöllagerbehältern nach einer Nutzungsdauer von über 30 Jahren
  19. Microstructure and mechanical properties of AZ31 Mg alloy produced by a new compound extrusion technique
  20. Failure analysis of a cracked Q125 casing for ultra-deep wells at the Tarim Oilfield
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