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Strong, ductile, and irradiation-tolerant structural materials are in urgent demand for improving the safety and efficiency of advanced nuclear reactors. Amorphous ceramics could be promising candidates for high irradiation tolerance due to thermal stability and lack of crystal defects. However, they are very brittle due to plastic flow instability. Here, we realized enhanced plasticity of amorphous...
Al-Cu eutectic composites are composed of α-Al and θ-Al2Cu phases. Al-Al2Cu interfaces play a crucial role in determining the deformation modes and mechanical properties of nanoscale Al-Cu composites. In this work, we studied the structures and properties of the $$ \left( {110} \right)_{{{\text{Al}}_{ 2} {\text{Cu}}}} \left\| {\left( {111} \right)_{\text{Al}} } \right. $$ 110 Al 2 Cu ...
Molecular dynamics simulations were performed on heterogeneous nanocrystalline Al lamellae composed of nanocrystalline (NC) and single-crystalline (SC) layers to study the effect of the heterogeneous microstructures on the propagation of preexisting cracks. Under tensile loading, the heterogeneous NC Al lamella exhibited higher crack growth resistance than the pure NC Al. In addition, a lower volume...
CALculation of PHAseDiagram-type (CALPHAD-type) thermodynamic databases for Mg alloy systems have been developed over the last two decades. In the present study, recent updates of the thermodynamic data related to the Mg-RE and Mg-Sn based systems to the FactSage FTlite database are reviewed. Several examples of applications of the new database to Mg alloy design are presented.
We present in situ indentation in a transmission electron microscope on Al-TiN multilayers with individual layer thicknesses of 50 nm and 2.7 nm to explore the effect of length scales on the plastic co-deformability of a metal and a ceramic. At 50 nm, plasticity was confined to the Al layers with brittle fracture in the TiN layers. At 5 nm and below, cracking in TiN was suppressed with co-deformation...
A new environmentally friendly technology with higher recovery of bismuth is proposed to extract bismuth from low-grade bismuthinite and co-production MnSO 4 from low-grade pyrolusite. The effects of simultaneous roasting process parameters on the sulfur-fixing rate and MnSO 4 formation rate are investigated. Based on the Pourbaix diagram of metal-sulfur-oxygen system,...
Using molecular dynamics (MD) simulations, we studied the dislocation pileup–grain boundary (GB) interactions. Two Σ11 asymmetrical tilt grain boundaries in Al are studied to explore the influence of orientation relationship and interface structure on dislocation activities at grain boundaries. To mimic the reality of a dislocation pileup in a coarse-grained polycrystalline, we optimized the dislocation...
Interface-dominated nanolayered crystalline composites exhibit extraordinary strength and hardness, far beyond those of their constituent materials. Modeling the deformation of such materials would aid in understanding and designing them for future applications. This task is a multiscale effort. Up to now, most modeling efforts lie at either the atomic scale or the mesoscale. Models that link the...
In this article, we highlighted twinning-associated boundaries that play crucial roles in nucleation, growth, and interactions of deformation twins. According to microscopic characterizations and atomistic simulations in Mg, three types of boundaries are reviewed, including (I) prismatic-basal boundaries associated with twin nucleation via pure-shuffle mechanism, (II) serrated coherent twin boundaries...
Thermal stabilities of Cu/Nb, Cu/Ag, and Cu/Mo multilayers are studied by a recently developed model for microstructure evolution in multilayers with immiscible constituents, which actually is an extension to the classic grooving theory. The experimentally evidenced zig–zag microstructure is found to form through grooving when grains are staggered in a “stair-like” fashion. Furthermore, stability...
Jian Wang is the guest editor for the Nanomechanical Materials Behavior Committee of the TMS Materials Processing & Manufacturing Division, and he coordinated the topic Modeling Mechanical Behavior of Ultrafine-grained Polycrystals in this issue.
In the past decade, core/shell nanowires (NWs) have attracted much attention due to the broad variety of potential applications of these structures in future nanoelectronic and nanophotonic devices. Because of the lattice mismatch between the core and shell materials, crystal dislocations often form to relax the mismatch strains. In this article, we propose a relaxation mechanism for the misfit strains...
Jian Wang is a technical staff member at Los Alamos National Laboratory and is the advisor to JOM from the Nanomechanical Materials Behavior Committee of the Materials Processing & Manufacturing Division of TMS.
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