Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 772, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.138686
Keywords
AZ31 Mg alloys; Mechanical properties; Pre-compression; Extension twins; DRX
Categories
Funding
- National Natural Science Foundation of China [U1810122, 51504162, 51704209, 51601123]
- Talent Training Program for Shandong Province Higher Educational Youth Innovative Teams (2019)
- Innovative Talents of Higher Education Institutions of Shanxi (2018)
- Natural Science Foundation of Shanxi Province [201801D221139]
- Project of International Cooperation in Shanxi [201803D421086]
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{10-12} extension twins were pre-introduced in the hot-rolled AZ31 Mg alloy plates by pre-compression at room temperature (RT) along the transverse direction (TD). Pre-introduced {10-12} extension twins substantially improved the yield strength of AZ31 Mg alloy plates and did not deteriorate the compression ratio. Especially at RT, 100 degrees C and 200 degrees C, the pre-compressed samples containing {10-12} extension twins exhibited much larger yield strength (122 MPa vs. 66 MPa, 121 MPa vs. 64 MPa and 118 MPa vs. 63 MPa) than the initial samples. The pre-compressed sample showed more obvious compression flow softening phenomenon than the initial sample at 200 degrees C, which was attributed to the dynamic recrystallization (DRX) process accelerated by pre-introduced {10-12} extension twins. When compressing at 300 degrees C, the compression flow curves of the initial and pre-compressed samples tended to coincidence, which was because the discontinuous dynamic recrystallization (DDRX) was the controlling mechanism in both kinds of the samples and the effect of pre-introduced {10-12} extension twins was vanished.
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