About

Yiyu Wang is an Assistant Professor in the Department of Mathematics at The Ohio State University. His areas of expertise include Algebraic Geometry and Combinatorics. He is based in the Zassenhaus Office (MW458) at 231 W 18th Ave, Columbus, OH. His professional website and contact information are provided, indicating his active engagement in research and academic activities within the department.

Research topics

• Condensed matter physics
• Materials science
• Crystallography
• Composite material
• Physics
• Nanotechnology
• Thermodynamics

Selected publications

• Comparing High-Temperature Mechanical Behavior of Novel CoNi-Based Superalloys and Conventional Ni-Based Superalloys Exhibiting Local Phase Transformation

  Metallurgical and Materials Transactions A · 2026-04-06

  articleOpen access

  Abstract Superalloys are renowned for their exceptional high-temperature strength and are essential in gas turbine engines. Much research has focused on solute partitioning to defects, leading to local phase transformations (LPT) that impact mechanical properties. This study investigates five single-crystalline CoNi-based alloys derived from polycrystalline CoWAlloy1, with variations in Nb, Re, Ta, Ti, and W. Their performance is compared with established Ni-based alloys (NA1, NA6, ME3, RRHT5) using constant strain rate (CSR) compression and compression creep tests. Deformation mechanisms were investigated utilizing transmission electron microscopy (TEM) and atomic resolution X-ray energy dispersive spectroscopy (EDS). Thermodynamic calculations were also employed to rationalize alloy behavior in the context of LPT. Results showed CSR testing at 850 °C ( $$\dot{\varepsilon }=1{0}^{-4}\,{\text{s}}^{-1}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mover> <mml:mi>ε</mml:mi> <mml:mo>˙</mml:mo> </mml:mover> <mml:mo>=</mml:mo> <mml:mn>1</mml:mn> <mml:msup> <mml:mrow> <mml:mn>0</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>4</mml:mn> </mml:mrow> </mml:msup> <mml:mspace/> <mml:msup> <mml:mrow> <mml:mtext>s</mml:mtext> </mml:mrow> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> ) parallels creep testing in predicting alloy performance within deformation regimes dominated by γ ′ shearing via planar defects. Nb and Ta were highlighted as critical in enhancing LPT by increasing η and χ ordering, unlike Ti, which showed significantly less influence. Although theoretical models suggested Re and W would enhance LPT, they exhibited poor behavior in creep tests due to low diffusivity. These findings validated using η -ordering tendency to estimate high-temperature performance and establish the groundwork for computationally driven LPT design in CoNi-based superalloys for disk applications.

  PublisherDOI

• Regimes of γ' Precipitation along Coherent Σ3 Annealing Twin Boundaries in Ni–Based Superalloys

  SSRN Electronic Journal · 2026-01-01

  preprintOpen access
  PublisherDOI

• Achieving high strain hardening and strength in an additively manufactured titanium alloy

  Nature Communications · 2025-11-20 · 6 citations

  articleOpen access

  Strain hardening is a crucial property of metals and alloys that directly affects their mechanical processability, safe usage, and durability throughout their service life. However, titanium alloys traditionally used in structural applications often exhibit limited strain hardening, restricting their broader use. In this work, we demonstrate that by employing additive manufacturing (AM), strong strain hardening with high strength can be simultaneously achieved in a commercially available titanium alloy. These remarkable properties arise from a martensitic microstructure originated from the AM process. The microstructure is characterized by nanosized martensite plates with extremely fine triple-twinned substructures. During tensile deformation, detwinning rather than dislocation slip gradually transforms this microstructure into single-twinned lamellae with ~10 nm twin boundary spacing and internal stacking faults, necessitating progressively higher stresses and resulting in significant strain hardening.

  PublisherOA PDFDOI

• High temperature oxidation of Ni-based superalloy 247 produced by electron beam powder bed fusion additive manufacturing

  Corrosion Science · 2025-09-05 · 4 citations

  articleOpen access

  This study investigates high temperature oxidation of Ni-base superalloy 247 processed by electron beam powder bed fusion (PBF-EB) compared with a conventionally cast (CC) counterpart. In terms of mass-gain during isothermal thermogravimetry at 1100 o C, the CC alloy outperformed the PBF-EB alloy. However, the PBF-EB alloy suffers from deeper internal oxidation due to its fine grain structure while shortening the transient oxidation stage. On the other hand, the CC alloy forms a non-homogeneous scale due to inhomogeneous distribution of bulky carbides and takes longer time to transition towards a steady-stage oxidation. The findings are analyzed and rationalized in the context of prior literature and thermodynamic-kinetic modeling. • In terms of specific mass-gain, CC 247 outperforms PBF-EB 247 • Fine-grained PBF-EB 247 shows deep internal oxidation and short transient stage • Cr consumption drive Al towards the surface, but kinetics is grain-size dependent

  PublisherDOI

• Computational Studies on BCC Superalloys

  SSRN Electronic Journal · 2025-01-01 · 1 citations

  preprintOpen accessSenior author
  PublisherDOI

• Phase transformation pathways in BCC-B2 superalloys

  Scripta Materialia · 2025-07-01 · 9 citations

  article
  PublisherDOI

• Substantial Change in Medium Range Ordering and its Influence on Glass Forming Ability and Mechanical Properties of ZrCu and ZrCuAl Metallic Glasses

  SSRN Electronic Journal · 2025-01-01

  preprintOpen access
  PublisherDOI

• Unique twinning mode and extended twin boundary core structure associated with symmetry breaking in a multifunctional Ti-Nb-based alloy

  Acta Materialia · 2025-01-23 · 4 citations

  articleSenior authorCorresponding
  PublisherDOI

• Solution of the Bloch Equation Based on Spectral Diagonalization and Matrix Exponential Integration: Modeling of SSFP for SNMR

  2025-05-07

  preprintOpen access

  We present a spectral-diagonalization-based matrix exponential integration (SD-MEI) algorithm for efficient and stable solutions of fully coupled Bloch equations in surface nuclear magnetic resonance (SNMR). Conventional explicit numerical methods exhibit cumulative discretization errors and escalating computational costs due to step-size dependence and finite precision limitations. SD-MEI integrates spectral diagonalization with matrix exponential operations, replacing iterative computations with a single eigendecomposition of the system matrix. This approach achieves parameter-robust computational complexity while maintaining numerical stability across broad RF field strengths (10$^{-10}$ T to 10$^{-5}$ T) and relaxation times (10 ms to 1000 ms). Validated for steady-state free precession (SSFP) dynamics in heterogeneous geomagnetic environments, the method enables high-accuracy modeling of transient magnetization evolution with large time steps. The framework advances SNMR efficient forward modeling and inversion while optimizing protocols by resolving critical limitations in existing numerical and analytical approaches.

  PublisherDOI

• Polarization-assisted calibration of camera–projector systems under non-uniform ambient lighting

  Journal of Optics · 2025-12-01

  article

  Abstract Accurate calibration is pivotal for precise measurements. Traditional calibration methods primarily focus on enhancing feature point extraction algorithms but often overlook the imaging process of the calibration images themselves. Under non-uniform ambient lighting conditions, errors arising from non-uniform surface reflections during calibration are difficult to eliminate, potentially compromising the camera calibration results. To address this issue, we propose a novel globally optimal polarization-assisted camera–projector calibration method. This approach employs an liquid crystal display projector to project polarized light in varying polarization states, analyzes the reprojection errors, and determines the optimal global polarization image, effectively eliminating the influence of non-uniform ambient light. Experimental results validate the effectiveness of the proposed method.

  PublisherDOI

Recent grants

• Collaborative Research: Design of Low-Hysteresis High-Susceptibility Materials by Nanodomain Engineering

  NSF · $308k · 2014–2018

• DMREF/Collaborative Research: Accelerated Development of Next Generation of Ti Alloys by ICMSE Exploitation of Non-Conventional Transformation Pathways

  NSF · $606k · 2014–2017

• Collaborative Research: Compositionally and Structurally Modulated Ferroelastic Films for Unprecedented Superelastic Properties

  NSF · $362k · 2024–2027

• Materials World Network: Collaborative Research: Modeling Ferroelastic Strain Glasses

  NSF · $309k · 2010–2014

• Collaborative Research: Traversals in Transformation Strain Space and Microstructure Design for High Performance Ferroelastic Materials

  NSF · $339k · 2020–2024

Frequent coauthors

• Dong Wang

  Xi'an Jiaotong University

  85 shared

• Xiaobing Ren

  Xi'an Jiaotong University

  73 shared

• Michael J. Mills

  34 shared

• Chen Ding

  Union Hospital

  33 shared

• Yipeng Gao

  32 shared

• Jiaming Zhu

  Hong Kong Polytechnic University

  28 shared

• Pengyang Zhao

  Shanghai Jiao Tong University

  27 shared

• Xiaoqin Ke

  Xi'an Jiaotong University

  25 shared

Education

• Ph.D., Materials Science and Engineering

  Rutgers University New Brunswick

  1995

• M.S., Materials Science and Engineering

  Rutgers University New Brunswick

  1992

Awards & honors

• Graduate Teaching Awards