Effect of Multi-Pass Equal Channel Angular Pressing on the Microstructure and Mechanical Properties of a Heterogeneous Mg88Y8Zn4 Alloy

doi:10.1016/j.jmst.2016.05.015

Abstract

Abstract:

The microstructure evolutions and mechanical properties of a heterogeneous Mg₈₈Y₈Zn₄ (in at.%) alloy during multi-pass equal channel angular pressing (ECAP) were systematically investigated in this work. The results show that four phases, i.e. α-Mg, 18R long period stacking ordered (LPSO) phase, Mg₂₄Y₅ and Y-rich phase, are present in cast alloy. During ECAP, dynamic recrystallization (DRX) occurs and the diameter of DRXed α-Mg grains decreases to 0.8 μm. Moreover, precipitation of lamellar 14H LPSO structure is developed within α-Mg phase. Both the refinement of α-Mg grains and precipitation of 14H LPSO contribute to the increase in micro-hardness from 98 HV to 135 HV for α-Mg. In addition, a simplified model describing the evolution of 18R LPSO phase is established, which illustrates that 18R undergoes a four-step morphological evolution with increasing strains during ECAP, i.e. original lath → bent lath → cracked lath → smaller particles. Compression test results indicate that the alloy has been markedly strengthened after multi-pass ECAP, and the main reason for the significantly enhanced mechanical properties could be ascribed to the DRXed α-Mg grains, newly precipitated 14H lamellas, 18R kinking and refined 18R particles.

Key words: Magnesium alloys, Equal channel angular pressing (ECAP), Long period stacking ordered (LPSO) phase, Microstructure, Mechanical property

Liu Huan,Cheng Zhaojun,Yan Kai,Yan Jingli,Bai Jing,Jiang Jinghua,Ma Aibin. Effect of Multi-Pass Equal Channel Angular Pressing on the Microstructure and Mechanical Properties of a Heterogeneous Mg₈₈Y₈Zn₄ Alloy[J]. J. Mater. Sci. Technol., 2016, 32(12): 1274-1281.

Figures/Tables 11

Fig. 1. Microstructure and EDS results of as-cast Mg88Y8Zn4 alloy: (a) optical image; (b) SEM image; (c) EDS result of I phase; (d) EDS result of II phase; (e) EDS result of III phase; (f) EDS result of IV phase.

Fig. 2. TEM observation of α-Mg phase (a) and LPSO phase (b) in as-cast Mg88Y8Zn4 alloy. Insets of (a) and (b) correspond to SAED patterns of α-Mg and LPSO phases.

Fig. 3. Optical microstructure of Mg88Y8Zn4 alloy after ECAP for (a) 4 passes, (b) 8 passes, (c) 12 passes and (d) 16 passes.

Fig. 4. SEM images of recrystallized α-Mg grains (a) and an enlarged area of DRX grains (b) in 4-pass ECAP specimen.

Fig. 5. Variations of the average diameters of α-Mg grains in ECAP alloy for different passes.

Fig. 6. SEM images of 14H LPSO phases formed in recrystallized α-Mg regions (a) and an enlarged region of 14H clusters (b) in 8-pass ECAP sample.

Fig. 7. TEM observation of the 14H LPSO lamellas. Inset shows the corresponding SAED patterns of 14H phase.

Fig. 8. SEM images of 18R LPSO phases in ECAP alloys: (a, b) severe kinkings of 18R phases in 4-pass and 16-pass ECAP samples; (c) rupturing 18R phases; and (d) ruptured 18R phases.

Fig. 9. Micro-hardness evolutions of α-Mg phase and 18R LPSO phase after ECAP for different passes.

Fig. 10. Typical engineering stress-strain compression curves of different ECAP samples at room temperature.

Fig. 11. Schematic illustration for the refinement process of 18R LPSO phases.

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Effect of Multi-Pass Equal Channel Angular Pressing on the Microstructure and Mechanical Properties of a Heterogeneous Mg₈₈Y₈Zn₄ Alloy

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