Peter Liaw

Dr. Peter Liaw

Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996-2100, USA
orcid

Research Focus & Metrics

Academic Career Length

37Years (1990-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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5 February 2017 in Metals
Verified
Journal Article
Open access
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YSYunzhu Shi
Yunzhu Shi
BYBin Yang
Bin Yang
Peter LiawPeter Liaw
Peter Liaw
Corrosion destroys more than three percent of the world’s gross domestic product. Therefore, the design of highly corrosion-resistant materials is urgently needed. By breaking the classical alloy-design philosophy, high-entropy alloys (HEAs) possess unique microstructures, which are solid solutions with random arrangements of multiple elements. The particular locally-disordered chemical environment is expected to lead to unique corrosion-resistant properties. In this review, the studies of the corrosion-resistant HEAs during the last decade are summarized. The corrosion-resistant properties of HEAs in various aqueous environments and the corrosion behavior of HEA coatings are presented. The effects of environments, alloying elements, and processing methods on the corrosion resistance are analyzed in detail. Furthermore, the possible directions of future work regarding the corrosion behavior of HEAs are suggested.

30 January 2019 in Nature Communications
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Journal Article
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PSPeijian Shi
Peijian Shi
WRWeili Ren
Weili Ren
TZTianxiang Zheng
Tianxiang Zheng
ZRZhongming Ren
Zhongming Ren
XHXueling Hou
Xueling Hou
Peter LiawPeter Liaw
Peter Liaw
Realizing improved strength–ductility synergy in eutectic alloys acting as in situ composite materials remains a challenge in conventional eutectic systems, which is why eutectic high-entropy alloys (EHEAs), a newly-emerging multi-principal-element eutectic category, may offer wider in situ composite possibilities. Here, we use an AlCoCrFeNi2.1 EHEA to engineer an ultrafine-grained duplex microstructure that deliberately inherits its composite lamellar nature by tailored thermo-mechanical processing to achieve property combinations which are not accessible to previously-reported reinforcement methodologies. The as-prepared samples exhibit hierarchically-structural heterogeneity due to phase decomposition, and the improved mechanical response during deformation is attributed to both a two-hierarchical constraint effect and a self-generated microcrack-arresting mechanism. This work provides a pathway for strengthening eutectic alloys and widens the design toolbox for high-performance materials based upon EHEAs.

19 November 2021 in Science
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Journal Article
Closed access
QPQingsong Pan
Qingsong Pan
LZLiangxue Zhang
Liangxue Zhang
RFRui Feng
Rui Feng
QLQiuhong Lu
Qiuhong Lu
Ke AnKe An
Ke An
LLLei Lu
Lei Lu
Strength by cyclic torsion: For most alloys, conventional or high entropy, increasing strength comes at the cost of poor ductility. Although there are many strategies to break this inverse relationship, Pan et al . now show that cyclic torsion on a high-entropy alloy enhances strength without degrading ductility (see the Perspective by Yeh). Cyclic torsion creates a gradient of dislocations and low-angle grain boundaries from the surface to the interior that organize into tiny stacking faults and twin when straining begins. These structures allow for the good ductility while simultaneously helping to work harden the alloy. —BG

20 January 2015 in Nature Communications
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Journal Article
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LSLouis J. Santodonato
Louis J. Santodonato
YZYang Zhang
Yang Zhang
MFMikhail Feygenson
Mikhail Feygenson
CPChad M. Parish
Chad M. Parish
MGMichael C. Gao
Michael C. Gao
Peter LiawPeter Liaw
Peter Liaw
The alloy-design strategy of combining multiple elements in near-equimolar ratios has shown great potential for producing exceptional engineering materials, often known as ‘high-entropy alloys’. Understanding the elemental distribution, and, thus, the evolution of the configurational entropy during solidification, is undertaken in the present study using the Al1.3CoCrCuFeNi model alloy. Here we show that, even when the material undergoes elemental segregation, precipitation, chemical ordering and spinodal decomposition, a significant amount of disorder remains, due to the distributions of multiple elements in the major phases. The results suggest that the high-entropy alloy-design strategy may be applied to a wide range of complex materials, and should not be limited to the goal of creating single-phase solid solutions.

1 February 2019 in Acta Materialia
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Journal Article
Closed access
YTY. Tong
Y. Tong
DCDa CHEN
Da CHEN
BHB. Han
B. Han
JWJ. Wang
J. Wang
RFR. Feng
R. Feng
JKJ.J. Kai
J.J. Kai

20 August 2021 in Science
Verified
Journal Article
Closed access
PSPeijian Shi
Peijian Shi
Runguang LiRunguang Li
Runguang Li
YLYi Li
Yi Li
YWYuebo Wen
Yuebo Wen
YZYunbo Zhong
Yunbo Zhong
YWYandong Wang
Yandong Wang
High-entropy herringbone alloy: Eutectic high-entropy alloys have a dual phase structure that could be useful for optimizing a material’s properties. Shi et al . found that directional solidification of an aluminum-iron-cobalt-nickel eutectic high-entropy alloy created a herringbone-patterned microstructure that was extremely resistant to fracture (see the Perspective by An). The structure contained lamellae of hard and soft phases, and the cracks that formed in the hard phase were arrested at the boundary of the soft phase. This, along with stress transfer, allowed a tripling of the maximal elongation while retaining high strength. —BG