Methods for determining a recovery state of a metal alloy
AssigneeGM Global Technology Operations LLC
InventorsRajesh Raghavan, Shashank Tiwari, Sushil Kumar Mishra
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Abstract
Methods for determining a recovery state of a metal alloy are disclosed herein. In one example, a fluctuation in a crystallographic grain orientation of the metal alloy is determined by utilizing electron backscatter diffraction (EBSD) data of the metal alloy. A processor of an electron backscatter diffraction machine utilizes a local orientation deviation quantifier to correlate the fluctuation in the crystallographic grain orientation of the metal alloy with a plastic strain recovery of the metal alloy. Other examples of the method are also disclosed herein.
Claims16
A method for determining a recovery state of a metal alloy, the method comprising:
- determining a fluctuation in a crystallographic grain orientation of the metal alloy, the determining being accomplished utilizing electron backscatter diffraction (EBSD) data of the metal alloy;
- and
- by a processor of an electron backscatter diffraction machine, utilizing a local orientation deviation quantifier to correlate the fluctuation in the crystallographic grain orientation of the metal alloy with a plastic strain recovery of the metal alloy, wherein the utilizing includes:
- evaluating, by the processor, a local average orientation deviation at each of a plurality of EBSD scan points of the metal alloy from a reference orientation at each of the plurality of EBSD scan points;
- plotting, by the processor, an area fraction of the local average orientation deviation at each of the plurality of EBSD scan points of the metal alloy, the EBSD scan points including a scan point for when the metal alloy is in a deformed state and an other scan point for when the metal alloy is in an at least partially recovered state;
- identifying, by the processor, θreference, a local orientation deviation angle for the metal alloy in the deformed state, and θrecovery, a local orientation deviation angle for the metal alloy in the at least partially recovered state;
- and
- determining that at least partial recovery of the metal alloy has occurred when the θrecovery is less than the θreference.
A method for determining a recovery state of a plastically-strained metal alloy, the method comprising:
- obtaining electron backscatter diffraction (EBSD) data of the metal alloy;
- from the EBSD data, identifying a fluctuation in grain orientations of the metal alloy;
- identifying, by a processor of an electron backscatter diffraction machine that generates the EBSD data, a local orientation deviation angle at each of a plurality of scan points in the EBSD by comparing the fluctuation in grain orientations with a reference orientation at each of the plurality of scan points in the EBSD data;
- plotting, by the processor, an area fraction for the local orientation deviation angles of each of the plurality of EBSD scan points;
- and
- from the plot, determining that at least partial plastic strain recovery of the metal alloy has occurred.
Dependencies are inferred from the claim text.