Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 739, Issue -, Pages 69-76Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.12.229
Keywords
Magnesium alloys; Extrusion; Non-flammability; Dynamic recrystallization; Mechanical properties; Yield asymmetry
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Funding
- National Research Council of Science & Technology (NST) grant by the Korea government (MSIP) [CRC-15-06-KIGAM]
- National Research Council of Science & Technology (NST), Republic of Korea [17-8900, CRC-15-06-KIGAM] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A new Mg alloy with the composition of Mg-8Al-0.3Zn-0.1Mn-0.3Ca-0.2Y was successfully fabricated by a low-temperature, low-speed indirect extrusion process. The extruded alloy showed excellent mechanical properties, i.e., a tensile yield strength of 379.3 MPa, ultimate tensile strength of 421.7 MPa, elongation of 11.3%, and yield asymmetry of 0.95, as well as a very high chip ignition temperature of 820 degrees C. The outstanding mechanical properties are attributed to the microstructural characteristics of the extruded alloy, that is, (i) grain boundary strengthening by fine recrystallized grains, (ii) precipitation hardening by abundant fine Mg17Al12 precipitates, and (iii) strain hardening by the deformed nonrecrystallized region with a strong basal texture that is unfavorable for basal slip during tension. Electron backscatter diffraction results showed that no twinning occurred in the recrystallized grains, which had a very small size of approximately 800 nm, whereas {10-12} twins were formed in the nonrecrystallized grains even at low compressive stress, which consequently increased the yield asymmetry. (C) 2017 Elsevier B.V. All rights reserved.
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