Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 31, Issue 3, Pages 666-678Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(21)65528-0
Keywords
Mg-Zn-Ca-Zr alloy; extrusion-shearing process; die design; dynamic recrystallization; mechanical properties
Categories
Funding
- Liaoning Revitalization Talents Program, China [XLYC1807021]
- Joint Research Fund of Liaoning - Shenyang National Laboratory for Materials Science, China [2019JH3/30100014]
- Innovation Talent Program in Sciences and Technologies for Young and Middle-aged Scientists of Shenyang, China [RC200414]
- Scientific Research Fund of Liaoning Provincial Department of Education, China [LJGD2020008]
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The novel ES composite process successfully processed the ZXK310 magnesium alloy, achieving excellent mechanical properties with grain refinement, deformation strengthening, and significant dynamic recrystallization. The alloy exhibited high strength and toughness due to the pinning of second phase and formation of ultrafine grains during the ES process.
A novel extrusion-shearing (ES) composite process was designed to fabricate fine-grained, high strength and tough magnesium alloy. The structural parameters of an ES die were optimized by conducting an orthogonal simulation experiment using finite element software Deform-3D, and Mg-3Zn-0.6Ca-0.6Zr (ZXK310) alloy was processed using the ES die. The results show that the optimized structural parameters of ES die are extrusion angle (alpha) of 90 degrees, extrusion section height (h) of 15 mm and inner fillet radius (r) of 10 mm. After ES at an extrusion temperature and a die temperature of 350 degrees C, ZXK310 alloy exhibited good ES forming ability, and obvious dynamic recrystallization occurred in the forming area. The grain size decreased from 1.42 mu m of extrusion area to 0.85 mu m of the forming area. Owing to the pinning of second phase and formation of ultrafine grains, the tensile strength, yield strength and elongation of alloy reached 362 MPa, 289 MPa and 21.7%, respectively.
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