Microstructure Evolution and Mechanical Properties of Titanium Nickelide during Pressing in Equal-Channel Angular Matrix with Quasi-Small Angle of Channels Intersection

Abstract

The article presents the results of the analysis of the microstructure and mechanical properties of titanium nickelide formed during pressing in an equal-channel angular matrix with a quasi-small angle of channels intersection. The conducted studies have shown that pressing in an equal-channel angular matrix with a quasi-small angle of channels intersection ensures the formation of a homogeneous sub-ultrafine-grained structure in the titanium nickelide alloy, while the average grain size, decreasing by 100-200 times, is 0.3-0.5 microns, and the tensile strength increases to 1350 MPa in 6 passes, which is almost 90% higher than in the coarse-grained quenched state.

Investigation of a new forging technology implementing shear deformation

“…Simple processes that allow implementing severe plastic deformations can include equal-channel angular pressing [1], including in an equal-channel step matrix [2], radial-shear rolling [3,4]. Various combined processes, including the combined processes of "rolling-pressing" [5], "pressing -drawing" [6] and many others, can be attributed to complex processes that allow to implement severe plastic deformations.…”