Preparation of the 0.4GNPs/Mg-8Al-1Sm magnesium matrix composites via plasma sintering and plasma forging two steps forming method. (March 2023)

• Record Type: Journal Article
• Authors: Zeng, Junming; Yu, Yandong; Yan, Zehua; Dai, Hongbin; Zhou, Hao
• Is Part Of: Materials today communications. Volume 34(2023)
• Publication Date: 2023-03
• Subjects: 0.4GNPs/Mg-8Al-1Sm MMCs·Two steps forming method·Double-size grain·Bimodal basal texture; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2023.105345
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: 0.4GNPs/Mg-8Al-1Sm magnesium matrix composites (MMCs) were prepared by plasma sintering and plasma forging (two steps forming method). The rapid formation behavior and mechanisms of 0.4GNPs/Mg-8Al-1Sm MMCs have been investigated. The results show that 0.4GNPs/Mg-8Al-1Sm MMCs have low compressive strength and elongation after plasma sintering (one-step forming), with values of only 198 MPa and 8.4%. The compressive strength (367 MPa) and elongation (10.1%) of 0.4GNPs/Mg-8Al-1Sm MMCs after plasma forging (two-step forming) were significantly improved, which were 85.3% and 20.2% higher than that of one-step forming, respectively. By comparing the internal microstructure of the 0.4GNPs/Mg-8Al-1Sm MMCs after one-step and two-step forming, it can be seen that the GNPs after the two-step forming are uniformly dispersed in the 0.4GNPs/Mg-8Al-1Sm MMCs and nicely bound to the dynamic precipitated phases. GNPs and precipitates promote the continuous dynamic recrystallization (CDRX) behavior, and promote the formation of double-size grain distribution in 0.4GNPs/Mg-8Al-1Sm MMCs. Moreover, the basal texture of 0.4GNPs/Mg-8Al-1Sm MMCs are deflected and bimodal peaks are formed, which weakens the anisotropy of the composites and improves the comprehensive mechanical properties of the material. Microstructure evolution provides favorable conditions for secondary processing of materials. Graphical Abstract: Fig Recrystallization and texture orientation after two steps forming. ga1