Achieving high hetero-deformation induced (HDI) strengthening and hardening in brass by dual heterostructures

doi:10.1016/j.jmst.2021.03.088

Abstract

Abstract:

Heterostructured materials have a superior combination of strength and ductility, due to their ability to produce hetero-deform induced (HDI) strengthening and hardening. Therefore, achieving high HDI strengthening and hardening is the primary goal for designing heterostructures. Here we report a dual heterostructure in brass that consists of the heterogeneous lamella and gradient structure, fabricated by rolling, partial annealing, and rotationally accelerated shot peening (RASP). The dual heterostructures are able to generate extra interfaces of heterogeneity compared to the single heterostructures, which could lead to higher HDI strengthening and hardening, and a more superior combination of strength and ductility. This finding presents a new pathway to designing heterostructures in metallic materials.

Key words: Heterostructure, Geometrically necessary dislocation, Hetero-deformation induced hardening, Mechanical property

T. Fang X., K. Li Z., F. Wang Y., M. Ruiz, L. Ma X., Y. Wang H., Y. Zhu, R. Schoell, C. Zheng, D. Kaoumi, T. Zhu Y.. Achieving high hetero-deformation induced (HDI) strengthening and hardening in brass by dual heterostructures[J]. J. Mater. Sci. Technol., 2022, 98: 244-247.

Figures/Tables 5

Fig. 1. (a) Strain-stress curves of the samples fabricated by different processing routes; (b) Strain hardening rate curves of the samples; (c) Comparison of mechanical properties of brass samples with different structures [25], [26], [27], [28], [29].

Fig. 2. Representative microstructure starting from surface (a) RASP and (b) PA+RASP samples; (c) and (d) TEM image of the nano/ultrafine layer of PA+RASP samples (< 30 μm) and grain size statistic of the nano/ultrafine layer; EBSD image of (e) RASP and (f) PA+RASP at depth ~ 100 μm; TEM image of (g) RASP and (h) PA+RASP at depth ~ 100 μm.

Fig. 3. (a) Hardness profile of three different samples; (b) Increment of hardness after 3% of tensile plastic deformation (the shaded area indicates the peak of the hardness profile).

Table 1 . Dislocation density increment at 3% tensile strain ( × 1014 m-2).

Depth	PA+RASP	RASP
~100 μm	0.76	1.77
~250 μm	2.70	4.42

Fig. 4. (a) Loading-unloading-reloading (LUR) test to measure the HDI stresses. (b) HDI stress calculated from the LUR curves.

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