Publications

1.

Fracture behavior of high-entropy alloys: Resistance to fracture from strain hardening and softening.

Matter 8-4 (2025).

P. Kumar, D. Cook, W. Wang, P. Borges, A. M. Minor, M. Asta, R. O. Ritchie*

DOI: https://doi.org/10.1016/j.matt.2025.102042

2.

Kink bands promote exceptional fracture resistance in a NbTaTiHf refractory medium-entropy alloy.

Science 384, 178–184 (2024).

D. H. Cook#, P. Kumar#*, C. H. Belcher, M. Payne, P. Borges, W. Wang, F. Walsh, A. Devaraj, M. Zhang, M. Asta, A. M. Minor, D. Apelian, E. J. Lavernia, R. O. Ritchie*

DOI: https://www.science.org/doi/10.1126/science.adn2428

3.

A strong fracture-resistant high-entropy alloy with nano-bridged honeycomb microstructure: A critical role of 3D printing in promoting strength without compromising toughness.

Nature Communications 15(1) (2024), 841.

P. Kumar, H. Sheng, D. H. Cook, K. Chen, U. Ramamurty, X. Tan, R. O. Ritchie*

DOI: https://doi.org/10.1038/s41467-024-45178-2

4.

On the strength and fracture toughness of an additive manufactured CrCoNi medium-entropy alloy.

Acta Materialia 258 (2023), 119249.

P. Kumar, M. Michalek, D. H. Cook, H. Sheng, K. B. Lau, P. Wang, M. Zhang, A. M. Minor, U. Ramamurty, R. O. Ritchie*

DOI: https://doi.org/10.1016/j.actamat.2023.119249

5.

Degradation of the mechanical properties of NbMoTaW refractory high-entropy alloy in tension.

Acta Materialia 279, 120297 (2024).

P. Kumar, X. Gou, D. H. Cook, N. J. Morrison, M. I. Payne, W. Wang, M. Zhang, M. Asta, A. M. Minor, R. Cao, Y. Li, R. O. Ritchie*

DOI: https://doi.org/10.1016/j.actamat.2024.120297

6.

Compressive vs. tensile yield and fracture toughness behavior of a body-centered cubic refractory high-entropy superalloy Al0.5Nb1.25Ta1.25TiZr at temperatures from ambient to 1200°C.

Acta Materialia 245 (2023), 118620.

P. Kumar, S. J. Kim, Q. Yu, J. Ell, M. Zhang, Y. Yang, J. Y. Kim, H. Park, A. M. Minor, E. S. Park, R. O. Ritchie*

DOI: https://doi.org/10.1016/j.actamat.2022.118620

7.

Exceptional cryogenic-to-ambient impact toughness of a low carbon micro-alloyed steel with a multi-heterogeneous structure.

Acta Materialia 274, 120019 (2024).

X. Xu#, P. Kumar#, R. Cao, Q. Ye, Y. Chu, Y. Tian, Y. Li*, R. O. Ritchie*

DOI: https://doi.org/10.1016/j.actamat.2024.120019

8.

Fracture Behavior of Laser Powder Bed Fusion Fabricated Ti41Nb via In-situ Alloying.

Acta Materialia 225 (2021), 117593.

S Huang*, P. Kumar, W. Y. Yeong, R. L. Narayan, U. Ramamurty

DOI: https://doi.org/10.1016/j.actamat.2021.117593

10.

Fatigue strength of additively manufactured 316L austenitic stainless steel.

Acta Materialia 199 (2020), 225–239.

P. Kumar, R. Jayaraj, J. Suryawanshi, U.R. Satwik, J. McKinnell, U. Ramamurty*

DOI: https://doi.org/10.1016/j.actamat.2020.08.033

11.

Microstructural optimization through heat treatment for enhancing the fracture toughness and fatigue crack growth resistance of selective laser melted Ti–6Al–4V alloy.

Acta Materialia 169 (2019), 45–59.

P. Kumar, U. Ramamurty*

DOI: https://doi.org/10.1016/j.actamat.2019.03.003

12.

Micro-and meso-structures and their influence on mechanical properties of selectively laser melted Ti-6Al-4V.

Acta Materialia 154 (2018), 246–260.

P. Kumar, O. Prakash, U. Ramamurty*

DOI: https://doi.org/10.1016/j.actamat.2018.05.044