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We report that a gradient structured Zr processed by asymmetric rolling and partial annealing possesses an exceptional synergy of high strength (σy ∼ 550 MPa) and high tensile ductility (εu ∼ 10.1%) much better than that (σy ∼ 250 MPa and εu ∼ 14.2%) of its coarse-grained (CG) counterpart. This gradient structure is characterized by a gradient dislocation density distribution from the surface to the...
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