Anthony Rollett

Professor Carnegie Mellon University

  • Pittsburgh PA

Anthony Rollett’s research focuses on microstructural evolution and microstructure-property relationships in 3D.

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Carnegie Mellon University

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Biography

Anthony Rollett’s research focuses on microstructural evolution and microstructure-property relationships in 3D, using both experiments and simulations. Interests include 3D printing of metals, materials for energy conversion systems, strength of materials, constitutive relations, microstructure, texture, anisotropy, grain growth, recrystallization, formability and stereology. He is co-director of the Next Manufacturing Center on additive manufacturing and previously worked at the Los Alamos National Laboratory, where he was group leader of metallurgy and deputy division director of materials science and technology.

Areas of Expertise

3D Printing ‎
Materials Science
Microstructural Evolution
Manufacturing & Materials Microstructure
Computational Materials Science
Advanced Manufacturing
Crystalline Materials

Media Appearances

NASA Aeronautics Selects Three University Teams for Research Help

NASA  online

2023-04-04

The JHU-CMU partnership is led by the University’s Somnath Ghosh, Michael G. Callas chair professor in the Department of Civil and Systems Engineering and director of the Computational Mechanics Research Laboratory, and CMU’s Anthony Rollett, a professor in the Department of Materials Science and Engineering and co-director of the Next Manufacturing Center.

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CMU To Lead NASA Space Technology Research Institute

Carnegie Mellon University  online

2023-03-20

"The STRI affords us an opportunity for a major collaboration through which we can construct the models that our partners at NASA very much need." — Tony Rollett

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A route for avoiding defects during additive manufacturing

CMU Engineering News  online

2020-11-27

“The real practical value of this research is that we can be precise about controlling the machines to avoid this problem,” says Anthony Rollett, a professor of materials science and engineeringOpens in new window and a lead co-author of the paper.

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Social

Industry Expertise

Manufacturing

Accomplishments

Chercheur d'Excellence (Outstanding Researcher). University of Lorraine

2012

Brahm Prakash Professor at the Indian Institute of Science (Bangalore)

2011

Member of Honor of the French Metallurgical Society

2015

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Education

Drexel University

Ph.D.

Materials Engineering

1987

Cambridge University

M.A.

Metallurgy & Materials Science

1976

Articles

Mapping nanocrystal orientations via scanning Laue diffraction microscopy for multi-peak Bragg coherent diffraction imaging

Journal of Synchrotron Radiation

2023

The recent commissioning of a movable monochromator at the 34-ID-C endstation of the Advanced Photon Source has vastly simplified the collection of Bragg coherent diffraction imaging (BCDI) data from multiple Bragg peaks of sub-micrometre scale samples. Laue patterns arising from the scattering of a polychromatic beam by arbitrarily oriented nanocrystals permit their crystal orientations to be computed, which are then used for locating and collecting several non-co-linear Bragg reflections. The volumetric six-component strain tensor is then constructed by combining the projected displacement fields that are imaged using each of the measured reflections via iterative phase retrieval algorithms. Complications arise when the sample is heterogeneous in composition and/or when multiple grains of a given lattice structure are simultaneously illuminated by the polychromatic beam

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Small dataset for hot cracking susceptibility of Al alloys and Ni alloys using dynamic X-ray radiography (DXR) technique

Data in Brief

2023

Hot cracking as the major concern in the manufacturing process of metal alloys is detrimental to part performance and can lead to catastrophic failure. However, current research in this field is restricted to the scarcity of the relevant hot cracking susceptibility data. Here, using the DXR technique provided at 32-ID-B beamline of Advanced Photon Source (APS) at Argonne National Laboratory, we characterized the hot cracking formation in Laser Powder Bed Fusion (L-PBF) process for ten commercial alloys (Al7075, Al6061, Al2024, Al5052, Haynes 230, Haynes 160, Haynes X, Haynes 120, Haynes 214, and Haynes 718). The extracted DXR images captured the post-solidification hot cracking distribution and allow the quantification of the hot cracking susceptibility of those alloys.

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Variant selection in laser powder bed fusion of non-spherical Ti-6Al-4V powder

Journal of Materials Science & Technology

2023

The presence of α/α′ on prior β/β grain boundaries directly impacts the final mechanical properties of the titanium alloys. The β/β grain boundary variant selection of titanium alloys has been assumed to be unlikely owing to the high cooling rates in laser powder bed fusion (L-PBF). However, we hypothesize that powder characteristics such as morphology (non-spherical) and particle size (50–120 µm) could affect the initial variant selection in L-PBF processed Ti-6Al-4V alloy by locally altering the cooling rates. Despite the high cooling rate found in L-PBF, results showed the presence of β/β grain boundary α′ lath growth inside two adjacent prior β grains.

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