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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Microstructural Template Consisting of a Face-Centered Cubic Matrix with Ordered Precipitates: Microstructural Evolution and Properties
Presentation Title High Temperature Microstructural Stability Mechanisms Revealed by Microscopy in Al-Cu-Mn-Zr Alloys
Author(s) Jonathan Poplawsky, Patrick Shower, Lawrence Allard, Matthew Chisholm, Dongwon Shin, Amit Shyam
On-Site Speaker (Planned) Jonathan Poplawsky
Abstract Scope Typical Al-alloys used for automotive applications can only withstand temperatures of 250C. Retention of a high number density of metastable 𝜃’ precipitates (Al2Cu) is crucial for these alloys’ strength. Recently, ORNL developed an affordable and castable Al-Cu alloy that maintains its strength after a lengthy exposure to 350C (> 200 Hrs). Mn and Zr additions have been shown to be critical for the high temperature stability through a series of atom probe tomography (APT) experiments, scanning transmission electron microscopy (STEM) experiments, and computational simulations. Mn and Zr segregate to both the coherent and semi-coherent 𝜃’ precipitate interfaces. APT was used to calculated interfacial Gibbsian excess that reveal segregation behaviors with time and temperature. The segregation stabilizes the precipitates due to a combined reduction in interfacial energy and solute drag mechanisms. APT was conducted at the CNMS, which is a U.S. DOE Office of Science user facility.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


A Nickel-based Superalloy Dual-reinforced by L12 Ni3Al and D022 Ni3V Ordered-fcc Precipitates
Alloying for Corrosion Resistance: the Effect of Manganese and Silicon on a Polycrystalline Nickel-based Superalloy
Coarsening and Creep Behavior of Co-Ni-Al-W-Ti-Ta-B Superalloy with High γ′ Solvus Temperature
Coarsening Kinetics and Mechanical Properties of fcc Compositionally Complex Alloys Strengthened by L12 Precipitates
Correlative High-resolution Characterization of the Early Stages of Precipitation During Direct Aging of Alloy 718
D022 + D022’ Dual-phase Microstructure in As-cast Al-Mo-Ti Alloys
Elevated Temperature Microstructure Evolution and Properties of an Equiatomic CrCoNi Superalloy Containing Al,Ti
FCC High-entropy Alloys Strengthened with L12 Precipitates: Alloying Strategies and Highlights
High Temperature Microstructural Stability Mechanisms Revealed by Microscopy in Al-Cu-Mn-Zr Alloys
Impact of L12-phase Dispersoids on the Hardening Behavior of Multi-phase Strengthened Aluminum Alloys
In-situ Transmission Electron Microscopy Investigation of Continuous Precipitation of Ni3Mo in a Ni-25Mo-8Cr Alloy Formed by Direct Current Magnetron Sputtering
Mapping the Mechanical Property Space of Al-Cu-Mn-Zr (ACMZ) Cast Aluminum Alloys with Superior Microstructural Stability
Nanoscale Precipitation-strengthened Al-Er-Sc-Zr-(V,Nb,Ta) Alloys
Novel fcc-Cu Matrix Based High Temperature Alloys Strengthened by Ordered Precipitates
Novel Microstructural Template Based on Ordered Intermetallic Precipitation in FCC Based Complex Concentrated Alloys
Ordered Precipitates and Mechanical Properties of Nickel-base Superalloys Studied by Analytical Scanning and Transmission Electron Microscopy
Precipitation and Deformation Mechanisms of γ’/γ” Co-precipitates in Alloy 718
Sc-free Nanoprecipitate-strengthened Aluminum Alloys with Exceptional Creep Resistance
Stress Induced Sensitization in HAZ of 304 LN Austenitic Stainless Steel
The Quantitative Model for Heat Treatment Parameters and Gamma Prime Variations on Nickel-base Superalloys

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