Process structure linkages for channel–die compressed 16-09-2014

PROCESS-STRUCTURE LINKAGES FOR CHANNEL–DIE COMPRESSED

AM30 MAGNESIUM ALLOY

Team Members

Akash Gupta

Dipen Patel

PROJECT DESCRIPTION Establish process-structure linkages for AM30 Magnesium alloy during

channel-die compression.

These linkages will reveal the effect of process parameters like temperature, strain rate and % strain on the evolution of texture during channel-die compression.

Source of Dataset - Orientation map datasets generated from EBSD test done on channel die compressed samples are provided by Prof Haitham El Kadiri, Mississippi State University

PROCESS DATA Channel die tests allows the faces of the sample to remain plane

(homogeneous deformation) while being compressed and prevent any lateral spreading.

EBSD datasets containing orientation maps are generated at different processing conditions of temperature, strain rate and strain level

Schematic diagram of (a) assembled channel die, and (b) various parts of channel dieRef: Antonyraj, A., Marin, E., Ma, Q., Wang, P., Horstemeyer, M., & King, R. (Oct 2010). TMS 2011, California

Temp(deg C) Strain rate (1/s)0% 3% 6% 9% 18%

RT 10.1 1 1 1

0.01 1 10.001 1 1 1 1

0% 30% 60% 73% 90%1

0.1 1 1 10.01 1 1 1

0.001 1 1 11

0.1 1 1 10.01 1 1 1 1

0.001 1 1 10

0.1 1 1 10.01 1 1 1

0.001 1 1 1

40Total microstructures =

Strain

Strain

200

300

400

STRUCTURE DATA 2-D pixel data containing

crystal orientations for Mg alloy polycrystalline material generated at different processing conditions.

300C EBSD DATA

10-2

10-3

10-

1

60% 73% 90%0%STRAIN RATE

STRAIN

PRESENT STATUS AND WAY FORWARD

Extracting orientations from .oim files and Image Segmentation

Microstructure function – h (crystal orientations)

Number of local states too high if we bin the microstructure using fundamental zone for hexagonal(depends on bin size)

Alternative approach is using GSH to generate n-point statistics