Improvement of mechanical properties of hot extruded and aged Mg-Zn-Mn-Sn alloy through Dy addition

• Published in: Materials characterization Vol. 187; p. 111874
• Main Authors: Xue, Hansong, Liu, Song, Xie, Wei, Zhou, Yang, Peng, Jianbo, Pan, Haitao, Zhang, Dingfei, Pan, Fusheng
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.05.2022
• Subjects: Dy addition; Mechanical property; Mg-Zn-Mn-Sn alloy; MgSnDy; Microstructures; Dy addition; Mg-Zn-Mn-Sn alloy; Microstructures; MgSnDy; Mechanical property
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2022.111874

The effects of various Dy addition on the microstructure and mechanical properties of Mg-6Zn-1Mn-3Sn (wt%, ZMT613) alloys were investigated. The results showed significant grain refinement and new MgSnDy phases were detected with Dy addition of the as-cast ZMT613 alloy. A small amount of Dy (≤0.8 wt%) can hinder the proportion of dynamic recrystallized (DRXed) grains during hot-extrusion process and enhance the basal texture of the alloy. The MgSnDy high-temperature phase (HTP) particles inhibited the recovery process and retained substructures during solution treatment, which promoted the precipitation of the second phase. The as-aged ZMT613–0.2Dy alloy showed optimum mechanical properties, where yield strength, ultimate tensile strength, and elongation were 336 MPa, 399 MPa, and 4.4%, respectively. •The microstructure can be improved significantly with Dy addition.•The formation mechanism of MgSnDy phases was revealed.•The mechanism of the basal texture evolvement of the alloy was revealed.•The mechanism of the improvement mechanical properties was revealed.