• 14019 Citations
1964 …2021
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Personal profile

Research Interests

Development of High-Temperature Cobalt-Based Superalloys

The goal of this research effort is to develop new high-temperatures cobalt-based superalloys, with the aim of supplanting nickel-based superalloys with gamma(f.c.c.) plus gamma-prime(L12 structure) microstructures, for use as turbine blades in commercial and millitary aircraft and land-based natural-gas fired turbines for producing electricity. The driving force for this research is that the maximum operating temperature of nickel-based superalloys is reaching a plateau and hence their thermodynamic efficiency is also on a plateau. These alloys are studied using atom-probe tomography, scanning electron microscopy, microhardness and creep measurements, and three-dimensional dislocation dynamics (In cooperation with Prof. David C. Dunand).

Five-Dimensional Correlative Studies of the Temporal Evolution of Nickel-Aluminum Alloys on a Nano- to Subnanoscale

The focus of this research is on temporal evolution of the nucleation, growth and coarsening gamma-prime (L12 structure) precipitates in Ni-Al alloys utilizing three-dimensional atom-probe tomography, scanning and transmission electron microscopies, monovacancy mediated lattice-kinetics Monte Carlo simulations. Phase separation in multicomponent alloys is basic to understanding and predicting microstructures of all high-temperature alloys.

HIgh-Temperature Aluminum Alloys

The aim of this research project is to increase the maximum operating temperature aluminum alloys. The highest operating temperature of commercial Al alloys in about 463 K. We have developed Al alloys that can operate at temperatures as high as 698 K for extended periods of time. Our alloys can be used to replace the front brake rotors in vehicles, thereby decreasing their weight and helping to make them more fuel efficient. (In cooperation with Prof. David C. Dunand).

A High Strength and High Toughness Steel

We are working on a high-strength and high-toughness steels for Naval applications. This is a low-ccarbon 10 wt.% Ni steel, which is subjected to QLT (quench, lamellarization, temperature) treatment that yields a steel with about 18 % austenite, which is strong, tough, projectile resistant and weldable.

Education/Academic qualification

Physical Metallurgy, Physics (minor), PhD, University of Illinois at Urbana-Champaign

… → 1965

Physical Metallurgy, MS, New York University

… → 1962

Physical Metallurgy, Physics (minor), BS, New York University

… → 1960

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Grants 2001 2021

heat resistant alloys
trajectories
nucleation
precipitates
degeneration
costs
scattering
configurations
atoms
tomography
toughness
high strength
steels
welding
microstructure
aluminum alloys
precipitates
tungsten
creep strength
ambient temperature

Research Output 1964 2019

Effect of micro-additions of Ge, In or Sn on precipitation in dilute Al-Sc-Zr alloys

Okle, P., Lin, J. D., Zhu, T., Dunand, D. C. & Seidman, D. N., Jan 2 2019, In : Materials Science and Engineering A. 739, p. 427-436 10 p.

Research output: Contribution to journalArticle

Microhardness
microhardness
Precipitates
precipitates
Aging of materials
Erbium alloys
Scandium alloys
Manganese alloys
Molybdenum alloys
Zirconium alloys

Effects of Si and Fe micro-additions on the aging response of a dilute Al-0.08Zr-0.08Hf-0.045Er at.% alloy

Michi, R. A., De Luca, A., Seidman, D. N. & Dunand, D. C., Jan 1 2019, In : Materials Characterization. 147, p. 72-83 12 p.

Research output: Contribution to journalArticle

Precipitates
Aging of materials
Microhardness
Kinetics
precipitates

The effect of phosphorus on the formation of grain boundary laves phase in high-refractory content Ni-based superalloys

Antonov, S., Chen, W., Lu, S., Isheim, D., Seidman, D. N., Feng, Q., Sun, E. & Tin, S., Mar 1 2019, In : Scripta Materialia. 161, p. 44-48 5 p.

Research output: Contribution to journalArticle

Laves phases
heat resistant alloys
Phase boundaries
refractories
Superalloys

γ’-(L12) precipitate evolution during isothermal aging of a Co–Al–W–Ni superalloy

Sauza, D. J., Dunand, D. C., Noebe, R. D. & Seidman, D. N., Feb 1 2019, In : Acta Materialia. 164, p. 654-662 9 p.

Research output: Contribution to journalArticle

Tungsten alloys
Nickel alloys
Coarsening
Nickel
Superalloys