Events Calendar

03 Feb
MEMS Department Seminar Series - Ravit Silverstein
Event Type

Lectures, Symposia, Etc.

University Unit
Department of Mechanical Engineering and Materials Science
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MEMS Department Seminar Series - Ravit Silverstein

This is a past event.

 “High-Performance Materials for Extreme Conditions: Interstitials Effects and the Science of Processing”

ABSTRACT:

Refractory multi-principal elements alloys (RMPEs) and SiC-based ceramic matrix composites (SiC-CMCs) are examples of advanced materials for high-temperature structural applications. However, some limiting factors prevent them from reaching their ultimate performance. Examples include interstitials effects along with processing design issues. This presentation will provide insights into the role of interstitials in RMPEs, the implications for structural design, and discuss a novel processing approach to elevate the temperatures of SiC matrices for CMCs.

The first part of this presentation will discuss the key challenges of fabricating robust SiC matrices caused by the hindrance to wetting of C surfaces by the Si melt. This work explores a preconditioning approach, using Si vapor of C surfaces, to mitigate reactive wetting with a controlled infiltration rate, hinder reaction chocking, and to ultimately achieve robust SiC matrices.

The second part of this presentation will focus on effects of dilute concentrations of interstitials (<1at%) in refractory equimolar Ti-Nb alloys, which is intended to provide insight into the potential underlying mechanisms of interstitials-induced phase transformation in higher-order RMPEs. This work will look into the transformation pathways between the parent BCC phase and the reaction products and provide insights into the preferred interstitials environments. To conclude, it be will discussed how these phase transformation paths can be applied to peruse further developments in advancing engineering materials.

BIOGRAPHY:

Ravit Silverstein is the Microscopy and Microanalysis Facility Manager and the TEM director at the University of California, Santa Barbara. Ravit received her Ph.D. in Materials Engineering from Ben-Gurion University (Advisor: Dan Eliezer) and was a research associate at the Applied Physics Division, National Nuclear Research Center in Israel. From February 2018 until November 2021, she was a post-doctoral fellow at the Materials Department at UC Santa Barbara (Advisor: Carlos G. Levi). Ravit is also the recipient of several awards, including the Intel award, VATAT (Israel council of higher education) postdoctoral fellowship, the Ben-Gurion postdoctoral fellowship, ISEF postdoctoral fellowship, the NEGEV graduate research fellowship, and participant in the 67th Lindau Nobel Laureate Meeting.

Thursday, February 3 at 11:00 a.m. to 12:00 p.m.

Benedum Hall, 102
3700 O'Hara Street, Pittsburgh, PA 15261

MEMS Department Seminar Series - Ravit Silverstein

 “High-Performance Materials for Extreme Conditions: Interstitials Effects and the Science of Processing”

ABSTRACT:

Refractory multi-principal elements alloys (RMPEs) and SiC-based ceramic matrix composites (SiC-CMCs) are examples of advanced materials for high-temperature structural applications. However, some limiting factors prevent them from reaching their ultimate performance. Examples include interstitials effects along with processing design issues. This presentation will provide insights into the role of interstitials in RMPEs, the implications for structural design, and discuss a novel processing approach to elevate the temperatures of SiC matrices for CMCs.

The first part of this presentation will discuss the key challenges of fabricating robust SiC matrices caused by the hindrance to wetting of C surfaces by the Si melt. This work explores a preconditioning approach, using Si vapor of C surfaces, to mitigate reactive wetting with a controlled infiltration rate, hinder reaction chocking, and to ultimately achieve robust SiC matrices.

The second part of this presentation will focus on effects of dilute concentrations of interstitials (<1at%) in refractory equimolar Ti-Nb alloys, which is intended to provide insight into the potential underlying mechanisms of interstitials-induced phase transformation in higher-order RMPEs. This work will look into the transformation pathways between the parent BCC phase and the reaction products and provide insights into the preferred interstitials environments. To conclude, it be will discussed how these phase transformation paths can be applied to peruse further developments in advancing engineering materials.

BIOGRAPHY:

Ravit Silverstein is the Microscopy and Microanalysis Facility Manager and the TEM director at the University of California, Santa Barbara. Ravit received her Ph.D. in Materials Engineering from Ben-Gurion University (Advisor: Dan Eliezer) and was a research associate at the Applied Physics Division, National Nuclear Research Center in Israel. From February 2018 until November 2021, she was a post-doctoral fellow at the Materials Department at UC Santa Barbara (Advisor: Carlos G. Levi). Ravit is also the recipient of several awards, including the Intel award, VATAT (Israel council of higher education) postdoctoral fellowship, the Ben-Gurion postdoctoral fellowship, ISEF postdoctoral fellowship, the NEGEV graduate research fellowship, and participant in the 67th Lindau Nobel Laureate Meeting.

Thursday, February 3 at 11:00 a.m. to 12:00 p.m.

Benedum Hall, 102
3700 O'Hara Street, Pittsburgh, PA 15261

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