BEGIN:VCALENDAR VERSION:2.0 METHOD:PUBLISH PRODID:-//Missouri State University/Calendar of Events//EN CALSCALE:GREGORIAN X-WR-TIMEZONE:America/Chicago BEGIN:VTIMEZONE TZID:America/Chicago BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 DTSTART:20070311T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU TZNAME:CDT END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 DTSTART:20071104T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU TZNAME:CST END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:c099153e-b42e-495a-a804-6108a260d731.222143@calendar.missouristate.edu CREATED:20220906T201644Z LAST-MODIFIED:20220906T201644Z LOCATION:Kemper Hall 204 SUMMARY:PAMS Seminar: "High-throughput Investigations of Phase Formation a nd Mechanical Properties in Complex Metallic Alloys" by Dr. Katharine Fl ores DESCRIPTION:Dr. Katharine FloresDepartment of Mechanical Engineering & Mat erials ScienceInstitute of Materials Science and EngineeringWashington Un iversity in St. Louis\n\n\nAbstract:\n\n\nMeeting the design requirements of the next generation of high performance transportation systems\, powe r generators\, and energy storage devices requires the discovery and deve lopment of new structural alloys with enhanced properties. In this work\, we integrate computational simulations and high-throughput synthesis met hods to rapidly screen and identify alloy compositions with desirable str ucture-property combinations. The first part of this presentation will fo cus on the application of this methodology to the discovery of metallic g lass-forming alloys. Using molecular dynamics simulations\, we investigat e the evolution of the atomic structure from the liquid to room temperatu re for more than 200 alloy compositions in a range of binary and ternary systems. These results are then compared with glass-forming compositional regimes identified experimentally in alloy libraries produced by a high- throughput laser-deposition technique. The simulated and experimental gla ss forming compositional ranges are found to be in excellent agreement. B ased on this comparison\, we then identify structural parameters in the s imulated liquid that are predictive of glass formation upon quenching. To further demonstrate the utility of the high-throughput synthesis method\ , we next apply it to investigate “high entropy” alloys. Compositional an d microstructural libraries of an AlxCoCrFeNi high entropy alloy are cons tructed over a wide composition range. As the Al content increased from x = 0.15-1.32\, the crystal structure was observed to transition from FCC to BCC/B2\, in excellent agreement with previously published work. In add ition to the presence of the expected phases\, the laser-processed micros tructure was surprisingly consistent with that produced by casting. In li ght of this\, the laser processing conditions were then varied in an effo rt to study the sensitivity of the microstructure and properties to heati ng and cooling rates. These results are compared with existing models for dendritic solidification. X-ALT-DESC;FMTTYPE=text/html:<html><head><title></title></head><body><p><b >Dr.&nbsp\;Katharine Flores</b><br><b>Department of&nbsp\;Mechanical Engi neering &amp\; Materials Science<br></b><strong>Institute of Materials Sc ience and Engineering</strong><br><b>Washington University in St. Louis</ b></p>\n<p>Abstract:</p>\n<p>Meeting the design requirements of the next generation of high performance transportation systems\, power generators\ , and energy storage devices requires the discovery and development of ne w structural alloys with enhanced properties. In this work\, we integrate computational simulations and high-throughput synthesis methods to rapid ly screen and identify alloy compositions with desirable structure-proper ty combinations. The first part of this presentation will focus on the ap plication of this methodology to the discovery of metallic glass-forming alloys. Using molecular dynamics simulations\, we investigate the evoluti on of the atomic structure from the liquid to room temperature for more t han 200 alloy compositions in a range of binary and ternary systems. Thes e results are then compared with glass-forming compositional regimes iden tified experimentally in alloy libraries produced by a high-throughput la ser-deposition technique. The simulated and experimental glass forming co mpositional ranges are found to be in excellent agreement. Based on this comparison\, we then identify structural parameters in the simulated liqu id that are predictive of glass formation upon quenching. To further demo nstrate the utility of the high-throughput synthesis method\, we next app ly it to investigate “high entropy” alloys. Compositional and microstruct ural libraries of an AlxCoCrFeNi high entropy alloy are constructed over a wide composition range. As the Al content increased from x = 0.15-1.32\ , the crystal structure was observed to transition from FCC to BCC/B2\, i n excellent agreement with previously published work. In addition to the presence of the expected phases\, the laser-processed microstructure was surprisingly consistent with that produced by casting. In light of this\, the laser processing conditions were then varied in an effort to study t he sensitivity of the microstructure and properties to heating and coolin g rates. These results are compared with existing models for dendritic so lidification.</p>\n<p></p></body></html> DTSTART;TZID=America/Chicago:20220915T160000 DTEND;TZID=America/Chicago:20220915T170000 SEQUENCE:0 URL:https://physics.missouristate.edu/seminars.htm CATEGORIES:Public,Alumni,Current Students,Faculty,Future Students,Staff END:VEVENT END:VCALENDAR