scispace - formally typeset
Search or ask a question
Author

Haiming Wen

Bio: Haiming Wen is an academic researcher from Missouri University of Science and Technology. The author has contributed to research in topics: Microstructure & Grain boundary. The author has an hindex of 23, co-authored 65 publications receiving 2287 citations. Previous affiliations of Haiming Wen include Northwestern University & University of California.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the relationship between precipitation phenomena, grain size and mechanical behavior in a complex precipitation-strengthened alloy system, Al 7075 alloy, a commonly used aluminum alloy, was selected as a model system in the present study.

995 citations

Journal ArticleDOI
TL;DR: In this paper, three-dimensional atom-probe tomography studies demonstrate that the distribution of Al is highly inhomogeneous in the sintered bulk samples, and Al-containing precipitates including Al(Cu,Zn)−O−N, Al-O-N and Al−N are distributed in the matrix.

420 citations

Journal ArticleDOI
TL;DR: In this paper, the design, phase formation, microstructure, mechanical behavior and strengthening mechanisms of a single-phase Co 25 Ni 25 Fe 25 Al 7.5 Cu 17.5 (at.%) high-entropy alloy (HEA) were investigated.

331 citations

Journal ArticleDOI
TL;DR: The results show that precipitation strengthening, as one of the main strengthening mechanisms, contributes to a tensile yield strength of ~1.52 GPa at room temperature, which heretofore represents the highest strength reported for an HEA with an appreciable failure strain of ~5.2%.
Abstract: High-entropy alloys (HEAs) are a class of metallic materials that have revolutionized alloy design. They are known for their high compressive strengths, often greater than 1 GPa; however, the tensile strengths of most reported HEAs are limited. Here, we report a strategy for the design and fabrication of HEAs that can achieve ultrahigh tensile strengths. The proposed strategy involves the introduction of a high density of hierarchical intragranular nanoprecipitates. To establish the validity of this strategy, we designed and fabricated a bulk Fe25Co25Ni25Al10Ti15 HEA to consist of a principal face-centered cubic (fcc) phase containing hierarchical intragranular nanoprecipitates. Our results show that precipitation strengthening, as one of the main strengthening mechanisms, contributes to a tensile yield strength (σ0.2) of ~1.86 GPa and an ultimate tensile strength of ~2.52 GPa at room temperature, which heretofore represents the highest strength reported for an HEA with an appreciable failure strain of ~5.2%.

225 citations

Journal ArticleDOI
TL;DR: In this paper, an Al alloy reinforced with a broad size distribution of B4C particles, ranging from several nanometers to submicrometers, was incorporated into an ultrafine grained Al matrix using cryomilling and thermomechanical consolidation.

113 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors demonstrate the possibility to precipitate a coherent reinforcing phase in a fcc-FeCoNiCr HEA matrix using minor additions of Ti and Al, and demonstrate that extraordinary balanced tensile properties at room temperature were achieved, which was due to a well combination of various hardening mechanisms, particularly precipitation hardening.

1,486 citations

Journal ArticleDOI
TL;DR: In this paper, a review of deformation twinning in nanocrystalline materials is presented, including deformation twins observed by molecular dynamics simulations and experiments, twinning mechanisms, factors affecting the twinning, analytical models on the nucleation and growth of deformations, interactions between twins and dislocations, and the effects of twins on mechanical and other properties.

1,015 citations

Journal ArticleDOI
TL;DR: In this article, the relationship between precipitation phenomena, grain size and mechanical behavior in a complex precipitation-strengthened alloy system, Al 7075 alloy, a commonly used aluminum alloy, was selected as a model system in the present study.

995 citations

Journal ArticleDOI
TL;DR: In this article, the authors provide a detailed review of the deformation mechanisms of HEAs with the complex concentrated alloys (CCAs) with the FCC and BCC structures, highlighting both successes and limitations.

769 citations