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Effect of Lattice Misfit on Microstructural Evolution and Mechanical Properties in Gamma-Prime Strengthened Cobalt-Based Superalloys

Description:

Superalloys strengthened by γ′(L12)-precipitates in γ(f.c.c.)-matrix exhibit superior high temperature mechanical properties and environmental resistance over long periods of operation, making them ideal candidates for aerospace and energy conversion applications. The emerging class of superalloys based on Co-Al-W ternary system was identified with a melting temperature 50-100 ˚C higher than...

Keyword:

Microstructural evolution, Co-based superalloys, Atom-probe tomography, Phase-field, Mechanical properties, and Creep

Subject:

Materials Science

Creator:

Chung, Ding-Wen

Owner:

Scholarly Digital Publishing

Language:

en

Date Uploaded:

04/29/2020

Date Created:

2020-01-01

Resource Type:

Dissertation

Alternate Identifier:

etdadmin_upload_717986 and http://dissertations.umi.com/northwestern:14989
Optimizing Nanoscale Precipitates in Aluminum Alloys by Microalloying with Transition Metals

Description:

Dilute Al-Sc-Zr-Si-based aluminum alloys retain their strength for long periods of time at elevated temperatures due to a dispersion of nanometric, coherent, and coarsening-resistant Al3(Sc,Zr) (L12 structure) nanoprecipitates that are formed upon aging. These alloys are attractive for replacement of dense steels and costly Ti alloys in the 250–400 °C...

Keyword:

L12 nanoprecipitates, Atom-probe tomography, Coarsening, High-temperature alloys, Creep, and Aluminum alloys

Subject:

Materials Science

Creator:

Michi, Richard Andrew

Owner:

Scholarly Digital Publishing

Language:

en

Date Uploaded:

04/29/2020

Date Created:

2020-01-01

Resource Type:

Dissertation

Alternate Identifier:

etdadmin_upload_718569 and http://dissertations.umi.com/northwestern:14999

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Effect of Lattice Misfit on Microstructural Evolution and Mechanical Properties in Gamma-Prime Strengthened Cobalt-Based Superalloys

Optimizing Nanoscale Precipitates in Aluminum Alloys by Microalloying with Transition Metals

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