Work

Effect of cryogenic temperature on the strengthening mechanisms of AZ61 Mg alloy extruded at different temperatures

Year: 2024

Type: article

Abstract: This study investigates the influence of extrusion and deformation temperatures on the mechanical properties of the AZ61 Mg alloy . Increasing the extrusion temperature from 300 to 400 °C led to larger grain size and higher basal texture intensity. At 400 °C, the AZ61 alloy exhibited more Al–Mn phases and fewer Mg 17 Al 12 phases, indicating enhanced dissolution of Mg 17 Al 12 in the α-Mg matrix. Uniaxial tensile tests were conducted at room temperature (RT) and cryogenic temperature (CT, −150 °C). Despite grain growth, a higher yield strength (YS) was achieved at higher extrusion temperatures due to the texture-strengthening mechanism. However, during deformation at CT, the higher YS was primarily attributed to the formation of multiple twinning within individual grains, causing twinning interactions. These twin-interacting boundaries create additional barriers to dislocation movement . Notably, the AZ61 sample extruded at 400 °C demonstrated the formation of stacking faults during deformation at CT, with dislocations accumulating around the faults. This contributed to the best strength without compromising ductility in this sample.

Source: Journal of Materials Research and Technology

DOI: 10.1016/j.jmrt.2024.09.068

Authors: Hafiz Muhammad Rehan Tariq, Umer Masood Chaudry, Joung Sik Suh, Young Min Kim, Tea-Sung Jun

Institutions: Incheon National University, Korea Institute of Materials Science

Language: English

Topic: Magnesium Alloys: Properties and Applications

Subfield: Biomaterials

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,430

Funders: Ministry of Science and ICT, South Korea, Korea Institute of Materials Science