Journal
MATERIALS & DESIGN
Volume 101, Issue -, Pages 131-136Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.03.141
Keywords
AZ80 magnesium alloy; Warm-hydrostatic extrusion; Microstructure; Mechanical properties; Extrusion ratio; Conical mandrel angle
Categories
Funding
- Major National Science and Technology Projects [ZX201204010101]
- Fundamental Research Funds for the Central Universities [30920140112008]
- Jiangsu Qinglan Project
- Jiangsu National Natural Science Foundation [BK20151489]
- Robust Munitions Center, CAEP [RMC2014B01]
- SAST [2015044]
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To meet the need for high strength tubes for various industrial applications, a new method, known as hydrostatic extrusion integrated with circular equal channel angular pressing (HECCAP), was proposed for the fabrication of AZ80 magnesium alloy tubes. Small diameter billets could be extruded into tubes of larger diameters using this method. The effects of the extrusion ratio (ER) and the conical mandrel angle (CMA) on the microstructure and tensile properties of the AZ80 magnesium alloy tubewere investigated. The HECCAP-treated alloys exhibited a partial dynamically recrystallized microstructure. More shear zones formed inside of these grains, and a higher recrystallization grain volume fraction were presented in the alloy after HECCAP treatment with a larger ER or CMA values. The tensile yield strength, ultimate tensile strength, and elongation percent increased as ER and CMA also increase. The highest ultimate tensile strength, tensile yield strength and elongation were 335 MPa, 308 MPa, and 7.2%, respectively, at an ER of 2.77 and CMA of 120 degrees. A formula was proposed to calculate the total generated plastic strain after HECCAP, which increased with increasing ER and CMA. (C) 2016 Elsevier Ltd. All rights reserved.
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