Advanced Real Time Imaging: Alloys
Sponsored by: TMS Functional Materials Division, TMS Structural Materials Division, TMS: Advanced Characterization, Testing, and Simulation Committee, TMS: Alloy Phases Committee, TMS: Biomaterials Committee
Program Organizers: Jinichiro Nakano, MatterGreen; David Alman, National Energy Technology Laboratory; Il Sohn, Yonsei University; Hiroyuki Shibata, Tohoku University; Antoine Allanore, Massachusetts Institute of Technology; Noritaka Saito, Kyushu University; Anna Nakano, US Department of Energy National Energy Technology Laboratory; Zuotai Zhang, Southern University of Science and Technology; Candan Tamerler, University of Kansas; Bryan Webler, Carnegie Mellon University; Wangzhong Mu, KTH Royal Institute of Technology; David Veysset, Stanford University
Tuesday 8:30 AM
March 16, 2021
Room: RM 14
Location: TMS2021 Virtual
Session Chair: Wangzhong Mu, KTH Royal Institute of Technology ; Bryan Webler, Carnegie Mellon University
8:30 AM Invited
In Situ Thermoelastic Property Evolution of Ni-based Concentrated Solid Solution Alloys under Extremes: Cody Dennett1; 1Idaho National Laboratory
Directly observing the evolution of material performance in situ under extreme conditions remains a great challenge. To fill this gap, transient grating spectroscopy (TGS) has been used to collect multi-property information in situ under high temperature exposure to ion beam irradiation. This all-optical method returns elastic and thermal transport properties with second-scale time resolution. Here, recent work using this methodology to track the evolution of Ni-based solid-solution alloys using the in situ ion irradiation TGS (I3TGS) beamline will be described. Tracking material property evolution during long exposure times (hours) provides a clear indication of when void swelling has occurred. On short timescales (seconds to minutes), observing rapid changes in thermoelastic properties as defect generation is initiated allows a unique window into bulk transient defect populations which are otherwise difficult to observe. Together, these studies demonstrate the growing utility of direct property and performance measurements in understanding evolving material systems.
8:50 AM
Atomic Scale Processes of Initial Oxidation of Cu and Cu-Ni Alloy Revealed by In Situ Environmental TEM: Meng Li1; Matthew Curnan1; Richard Garza1; Stephen House1; Wissam Saidi1; Judith Yang1; 1University of Pittsburgh
The initial oxidation processes of metals and alloys are essential for fundamental understanding of oxidation and plays key roles in corrosion prediction, catalyst design and oxide control. Despite numerous prior studies in metal and alloy oxidation, the microstructural evolution during initial oxidation process, i.e. transition from clean metal/alloy surface to oxide scale, is not well understood, especially at atomic scale. Here we use correlated in situ Environmental TEM and atomistic simulations to investigate the atomic-scale processes of initial oxidation on pure Cu and Cu-Ni. The atomic resolution processes of surface reconstruction formation, oxide nucleation and growth processes are observed and analyzed, which provides key evidences for initial oxidation of Cu and Cu-Ni alloy. These atomic scale experimental observations, in correlation with multi-scale simulations, will help unveil the mechanism during initial oxidation in metal and alloys. Funding support: NSF-DMR grants 1905647, 1410055, 1508417, 1410335
9:10 AM
In Situ Investigation of the Effect of Ion Irradiation and Carbon Addition in GST on Crystallization and Amorphization Thresholds: Trevor Clark1; David Adams1; Khalid Hattar1; 1Sandia National Laboratories
The rapid phase change in germanium antimony tellurium (GST) make it widespread in memory applications. Typical transitions between crystalline and amorphous phases occurs at temperatures in the range of 100-150 °C. The reliability of memory devices in extreme environments is critical for applications such as in satellites and extra-terrestrial exploration where radiation damage can cause phase change. In situ transmission electron microscopy (TEM) is utilized to observe the real time crystallization due to applied heating for a variety of C doped GST compositions. In this work, thin films were prepared for TEM via DC magnetron sputter deposition and irradiated with 2.8 MeV Au ions ex situ to a range of damage levels. Increasing levels of C increase the crystallization temperature. In situ ion irradiation TEM experiments investigated the amorphization thresholds of crystallized films. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.
9:30 AM
High-velocity Microparticle Impact Modes for Mismatched Metals: David Veysset1; Mostafa Hassani2; Yuchen Sun1; Keith Nelson1; Christopher Schuh1; 1Massachusetts Institute of Technology; 2Cornell University
Using an all-optical micro-ballistic platform, we study the high-velocity microparticle impact behavior of metals for different combinations of particle and substrate. Under specific impact conditions, metallic particles can bond, instead of rebound, to metallic substrates upon impacting at velocities beyond a material- and process-dependent threshold velocity. Through real-time observations, we image particle deformation upon impact and measure threshold adhesion velocities for nine particle/substrate pairs. Supported by post-mortem examinations, we identify three impact modes of behavior: splatting (extreme flattening of the particle), co-deformation (similar plastic strain in particle and substrate), and penetration (particle embedment in substrate). We develop an analytical framework to predict the operative impact regime for a given particle/substrate combination and propose an impact ratio indicator based on material properties. The impact ratio aims to predict the impact modes and is validated with the nine material pairs presented in this study and six other pairs taken from the literature.
9:50 AM
Dynamics of Abnormal Grain Growth in a Particle-containing System Uncovered by Multimodal Three-dimensional X-ray Imaging: Jiwoong Kang1; Ning Lu1; Nancy Senabulya1; Nicolas Gueninchault2; Ashwin Shahani1; 1University of Michigan; 2Carl Zeiss X-ray Microscopy, Inc.
Abnormal grain growth (AGG) is a discontinuous process in which a few solid grains grow more rapidly than other grains, significantly influencing the properties of a granular microstructure. To better understand the mechanism of AGG in particle-containing alloys, we integrate laboratory-based X-ray absorption- and diffraction-contrast tomography (ACT and DCT, respectively) and image the evolution of microstructure in Al-3.5wt%Cu. The 4D data enables us to uncover what microstructural features set the abnormal grain apart from its neighbors. We find the distribution of grain boundaries (imaged via DCT) becomes more closely correlated to the distribution of Al2Cu particles (imaged via ACT) upon annealing, suggesting that the abnormal grain nucleates in a relatively particle-free region. Once it has attained its size advantage, the abnormal grain persists to grow due to a large capillary driving force. This study provides new insights on the origin of AGG with implications to the manufacture of single crystals.