Enhanced Mechanical Properties of Pure Zirconium via Friction Stir Processing

doi:10.1007/s40195-019-00939-7

Abstract

Abstract:

Friction stir processing (FSP), as a new kind of severe plastic deformation technique, can refine and homogenize the microstructure of metallic material. In this study, the effect of FSP on the microstructure and mechanical properties of pure Zr was investigated using electron backscatter diffraction analysis, microhardness and room-temperature tensile testing. The fine-grained (FG) structure with an average grain size of?~?5.3 μm was obtained in the processed zone, where the average microhardness was?~?198 HV, 1.6 times higher than that of base metal. Furthermore, tensile property of FG pure Zr exhibited obvious anisotropy owing to strong texture. Both grain size and texture had a significant effect on strength and ductility of FG pure Zr. High yield strength (248 MPa) and ultimate tensile strength (483 MPa), as well as good uniform elongation (10%) were achieved, which demonstrated that FSP was an effective method to fabricate bulk FG pure Zr with high strength and good ductility.

Key words: Friction stir processing, Pure zirconium, Grain size Texture, Mechanical property

Wen Wang, Peng Han, Jie Yuan, Pai Peng, Qiang Liu, Fei Qiang, Ke Qiao, Kuai-She Wang. Enhanced Mechanical Properties of Pure Zirconium via Friction Stir Processing[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(1): 147-153.

Figures/Tables 8

Fig. 1 a Illustration of FSP and sampling position, b specific fixture used for tensile testing. AS Advancing side, RS retreating side, PD processing direction, TD transverse direction, ND normal direction, RD rolling direction

Fig. 2 a Cross-sectional macrostructure of FSP pure Zr, b, c IPFs, d, e grain size distributions, f, g misorientation angle distributions in d, f BM, e, g PZ, respectively

Fig. 3 PFs in a BM, b PZ

Fig. 4 Cross-sectional microhardness distribution of FSP pure Zr

Fig. 5 Engineering stress-strain curves of BM-PD, BM-TD, FSP-PD and FSP-TD specimens

Table 1 Tensile property of BM and FSP specimens

Specimens	σ_s (MPa)	σ_b (MPa)	ε_u (%)	ε_t (%)
BM-PD specimen	135?±?5	391?±?3	18?±?2	48?±?1
BM-TD specimen	137?±?6	390?±?5	18?±?4	44?±?3
FSP-PD specimen	248?±?3	483?±?5	10?±?1	51?±?2
FSP-TD specimen	136?±?4	391?±?7	16?±?2	45?±?3

Fig. 6 SFs distributions of prismatic slip {10$ \bar{1} $0}?〈1$ \bar{2} $10〉?of different specimens: a BM-PD, b BM-TD, c FSP-PD, d FSP-TD specimens

Fig. 7 Representative tensile properties of FG and UFG pure Zr fabricated by SPD techniques. Hollow symbols are reported data in the literature [4, 37, 38, 39, 40, 41, 42]. Solid symbols are experimental data in this study

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