Microstructural softening induced adiabatic shear banding in Ti-23Nb-0.7Ta-2Zr-O gum metal

doi:10.1016/j.jmst.2020.03.042

Abstract

Abstract:

Ti-23Nb-0.7Ta-2Zr-O gum metal (GM) is an attractive candidate material for applications that require superior mechanical properties. In our earlier investigation of the GM [1], geometrical softening and the generation of adiabatic shear bands (ASBs) were proposed as primary reasons for the documented anisotropic impact response. In the present study, electron backscattered diffraction (EBSD) analysis reveals two different deformed microstructures, i.e., deformed ultrafine grains (UFGs) and dynamically recrystallized UFGs, formed in the ASBs of GM samples processed by extrusion equal channel angular pressing (ECAP), respectively. Additional calculation of temperature rise during dynamic compression suggests that the above microstructure differences in the ASBs was originated from their different maximum ASB temperatures (608?K for extruded GM and 1159?K for ECAP-processed GM). Moreover, our calculation on the temperature at the onset of ASBs indicates that microstructural softening is the primary cause for the development of ASBs in both extruded GM (321?K) and ECAP-processed GM (331?K).

Key words: Gum metal, Split hopkinson bar, Adiabatic shear band, Microstructures

Silu Liu, Y.Z. Guo, Z.L. Pan, X.Z. Liao, E.J. Lavernia, Y.T. Zhu, Q.M. Wei, Yonghao Zhao. Microstructural softening induced adiabatic shear banding in Ti-23Nb-0.7Ta-2Zr-O gum metal[J]. J. Mater. Sci. Technol., 2020, 54: 31-39.

Figures/Tables 11

Fig. 1. Schematic diagrams of the material fabrication process and sample coordinate system. (a) The extrusion process with the green arrow indicating the extrusion direction (ED). (b) The equal channel angular pressing (ECAP) process with the sample coordinate system, in which the red, green and blue arrows represent the transverse direction (TD), extrusion direction (ED) and normal direction (ND), respectively.

Fig. 2. Engineering strain-stress curves of Extruded-GM (blue line) and ECAP-GM (red line). The black triangles marked the ends of the stress plateaus.

Table 1 Mechanical parameters from engineering and true stress-strain curves of the impacted Extruded-GM and ECAP-GM specimens.

	End point of peak stress plateau				20% engineering strain
	Engineeringstress (MPa)	Engineering strain (%)	True stress (MPa)	True strain (%)	Engineering stress (MPa)	Engineering strain (%)	True stress (MPa)	True strain (%)
Extruded-GM	1212	8.6	1108	8.2	679	20.0	543	18.3
ECAP-GM	1381	11.0	1228	10.5	1008	20.0	806	18.3

Fig. 3. (a) The IPF-Z orientation map from the ED-TD plane of Extruded-GM, inset is the IPF-Z coloring code; (b) inverse pole figures of (a); (c) the zoom-in view and local misorientation map of Extruded-GM, blue, green and red colors in the rainbow bar represent low (<?1°), medium (from 1° to 3°) and high (from 3° to 5°) misorientations; (d) GBs displayed on (c); (e) the recrystallization map of (c), blue, yellow, red colors indicate recrystallized, substructured and deformed areas, respectively.

Fig. 4. (a) The IPF-Z orientation map of an area from the ED-TD plane ofECAP-GM; (b) pole figures of (a); (c) the local misorientation map of (a).

Fig. 5. (a, b) The IPF-Z orientation maps of areas crossed by ASBs from the ND-TD plane of Extruded-GM-DY and ECAP-GM-DY, respectively [1]. The transition areas were enveloped by dashed lines and highlighted by “T”.

Fig. 6. (a, c) The zoom-in views of areas in the ASBs of Extruded-GM-DY and ECAP-GM-DY; (b, d) the grain size distributions in the ASBs of Extruded-GM-DY and ECAP-GM-DY.

Fig. 7. (a, c) Pole figures of the ASBs in Extruded-GM-DY and ECAP-GM-DY, SD and NSP represent shear direction and the direction being normal to shear plane; (b, d) pole figures of matrix areas in Extruded-GM-DY and ECAP-GM-DY.

Fig. 8. (a, b) The local misorientation maps of the ASBs of Extruded-GM-DY and ECAP-GM-DY; (c, e) GB distributions of matrix areas in Extruded-GM-DY and ECAP-GM-DY; (d, f) GB distributions of ASBs in Extruded-GM-DY and ECAP-GM-DY.

Fig. 9. (a, b) The recrystallization maps of the ASBs of Extruded-GM-DY and ECAP-GM-DY; (c, d) statistic fractions of recrystallized area (Recryst.), substructured area (Sub.) and deformed area (Defor.) in Fig. 9(a, b).

Fig. 10. (a) The temperature versus engineering strain of Extruded-GM-DY (blue line) and ECAP-GM-DY (red line) and (b) the temperature (T) vs time of Extruded-GM-DY (blue line) and ECAP-GM-DY (red line).

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