This Summer I analyzed data that was taken in the Spring of 2016. We collected data at the advanced photon source (APS) at Argonne National Laboratories. In the experiment, we wanted to see how metallic glasses were affected by cryogenic cycling. Specifically, we had samples of La55Ni20Al25, La55Ni10AL35 and Cu46Zr46Al7Gd1, in rod and ribbon form, with samples of them both annealed and unannealed (virgin). The cryogenic cycling would get the glasses to liquid nitrogen temperatures, and then back to room temperature, and data was taken after 0, 5, 10, 20, 30, 40, and 60 cycles.
The final methodology used to collect the data was to collect an S(q) file and find the S(q1) and q1 using a peak-finding program.
The program used to get the S(q) file was called X-ray Batch_08202014, which took the empty, empty dark, dark and sample images and compiled them to give a massive amount of data, including the S(q) and q. While operating the program, it is important to make sure that it is running 10 frames and goes for 15 angstroms. other than that, only the background should be adjusted to collect all the data.
We used 5 methods to adjust the background. We normalized using the PDF, monitor with and without time, and moa with and without time. In the end, we ended up using the monitor with time graphs because that was the ‘cleanest’ data.
In order to get S(q1) and q1, We used an octave program called S_peakfind_v2.m. I had made the slight adjustment to it so that it would print the S(q1) and q1 after running the program. In order to run the program, just but in the file location of the S(q) file that needs to be analyzed.
We noticed three major trends in the data:
1) Cryogeneic cycling has no noticeable effect on q1 over any of the samples, and that there is no major change in q1 between the same compositions
2) The annealing process raised the S(q1) by about 3% for all samples.
3) Cryogenic cycling had no noticeable effect on the La samples, but there did appear to be a rise in S(q1) for the Cu samples.