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In situ characterization of work hardening and springback in grade 2 α-titanium under tensile load

DOI: 10.1016/j.actamat.2019.09.039 DOI Help

Authors: K. Sofinowski (Paul Scherrer Institut; École Polytechnique Fédérale de Lausanne) , M. Šmíd (Paul Scherrer Institut) , S. Van Petegem (Paul Scherrer Institut) , S. Rahimi (University of Strathclyde) , T. Connolley (Diamond Light Source) , Helena Van Swygenhoven (Paul Scherrer Institute; École Polytechnique Fédérale de Lausanne)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acta Materialia , VOL 181 , PAGES 87 - 98

State: Published (Approved)
Published: December 2019
Diamond Proposal Number(s): 19236

Open Access Open Access

Abstract: Plastic effects during sheet metal forming can lead to undesirable distortions in formed components. Here, the three-stage work hardening and plastic strain recovery (“springback”) in a cold-rolled, α-phase commercially pure titanium is examined. Interrupted standard tensile tests with in situ x-ray diffraction and quasi- in situ electron backscatter diffraction show that twinning plays a minor role in both of these phenomena. The experiments give evidence that the observed work hardening plateau is the result of an abrupt activation and multiplication of  c + a  slip and a subsequent redistribution of load between grain families. The springback can be attributed to inelastic backwards motion and annihilation of dislocations, driven by backstresses from dislocation-based hardening during loading. The peak broadening behavior, observed by x-ray diffraction, suggests that the internal stress state is highest in the rolling direction, resulting in consistently higher springback magnitude along this direction.

Journal Keywords: Springback; Work hardening plateau; CP-titanium; In situ x-ray diffraction; EBSD

Subject Areas: Materials, Engineering

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing