Tension-Compression Yield Asymmetry Influenced by the Variable Deformation Modes in Gradient Structure Mg Alloys

doi:10.1007/s40195-019-00934-y

Abstract

Abstract:

Surface mechanical attrition treatment (SMAT) was carried out on hot-rolled AZ31 Mg samples along two orthogonal directions; as a result, two types of gradient structures with different grain sizes and texture components in different layers were produced. The tension-compression yield asymmetry (YA) was studied using samples with different thicknesses, in order to elucidate the effect of combinations of variable deformation modes operating in different layers of the two oriented SMAT samples. The 0° oriented SMAT sample containing layers with strong basal texture displayed significant YA, because of either dislocation slip or extension twinning domination during tension or compression. By contrast, the 90° oriented SMAT sample containing layers with coexisting orthogonal texture components had an obviously weakened YA, which was attributed to the multi-deformation modes cooperating during tension or compression, i.e., extension twinning or detwinning in conjunction with dislocation slips, leading to close yield stresses compared between tension and compression.

Key words: Mg alloy, Gradient structure, Yield asymmetry, Texture, Deformation mechanism

Jiang-Li Ning, Bo Xu, Yun-Li Feng, Xu-Dong Li, Xin-Kang Li, Wei-Ping Tong. Tension-Compression Yield Asymmetry Influenced by the Variable Deformation Modes in Gradient Structure Mg Alloys[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(2): 252-266.

Figures/Tables 16

Fig. 1 a Optical micrograph, b (0001) pole figure of RD-TD cross section of as-received HR plate

Fig. 2 Schematic illustration of two sample orientations used for SMAT process and tensile and compression tests

Fig. 3 Optical micrographs of ND-RD sections of a SMAT 0°, b SMAT 90° samples

Fig. 4 (0001) PFs at different depths scanned from planes parallel to the treated surface: 350 μm in the SMAT a 0°, b 90° samples; 700 μm in the SMAT c 0°, d 90° samples; 1500 μm in the SMAT e 0°, f 90° samples

Fig. 5 Tensile and compression true stress-true strain curves of HR a 0°, b 90° samples, SMAT c 0°, d 90° samples with 0.7 mm thickness, SMAT e 0°, f 90° samples with 1.5 mm thickness

Table 1 Yield stresses of SMAT 0° and 90° samples with different thicknesses obtained by tension and compression in comparison with the HR 0° and 90° samples

Fig. 6 Optical micrographs of ND-RD sections of SMAT a 0°, b 90° samples with thickness of 1.5 mm after tension to strain of 5%

Fig. 7 Inverse pole figure maps of ND-RD sections of the SMAT a 0°, b 90° samples after tension to strain of 5%

Fig. 8 Calculated SFs for basal and prismatic slips of different layers in SMAT 0° sample after tension: a 0 μm-350 μm, b 350 μm-700 μm, c 700 μm-1000 μm for basal slip; d 0 μm-350 μm, e 350 μm-700 μm, f 700 μm-1000 μm for prismatic slip

Fig. 9 (0001) PFs at different depths scanned from planes parallel to the treated surface after tension to strain of 5%: 700 μm in the SMAT a 0°, b 90° samples; 1500 μm in the SMAT c 0°, d 90° samples

Fig. 10 Calculated SFs for basal and prismatic slips of different layers in SMAT 90° sample after tension: a 0 μm-350 μm, b 350 μm-700 μm for basal slip; c 0 μm-350 μm, d 350 μm-700 μm for prismatic slip

Fig. 11 Optical micrographs of ND-RD sections of SMAT a 0°, b 90° samples with thickness of 1.5 mm after compression to strain of 5%

Fig. 12 Inverse pole figure maps of ND-RD sections of SMAT a 0°, b 90° samples after compression to strain of 5%

Fig. 13 Calculated SFs in the layer of 0-350 μm of the two samples after compression: a basal slip, b prismatic slip for the SMAT 0° sample; c basal slip, d prismatic slip for the SMAT 90° sample

Fig. 14 (0001) PFs after compression to strain of 5%: derived by EBSD from the layer of 350-700 μm of the a SMAT 0°, b SMAT 90° samples; derived by XRD scanned from planes parallel to the treated surface at the depth of 1500 μm of the c SMAT 0°, d SMAT 90° samples

Table 2 Variable deformation modes dominating in different layers of SMAT 0° and 90° samples during tension or compression

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