Method and analysis for determining yielding of titanium alloy with nonlinear Rayleigh surface waves

Shifeng Guo, Lei Zhang, Meysam Sharifzadeh Mirshekarloo, Shuting Chen, Yi Fan Chen, Zheng Zheng Wong, Zhiyuan Shen, Huajun Liu, Kui Yao

Research output: Contribution to journalArticleResearchpeer-review

13 Citations (Scopus)

Abstract

Methods for determining yielding of titanium (Ti) alloy material with second harmonic Rayleigh ultrasonic wave are investigated. Both piezoelectric angle beam transducers and high frequency laser scanning vibrometer (LSV) are used to detect ultrasonic signals in the Ti alloy specimens with different plastic strain levels. Technical features and outcomes with use of piezoelectric transducers and LSV are compared. The method using piezoelectric transducers, with much higher signal-to-noise ratio than LSV, has been further improved by deploying two transducers with central frequencies corresponding to the fundamental and second order harmonic signals respectively to improve the testing reliability and accuracy. Both the techniques using piezoelectric transducer and LSV demonstrate consistently that the acoustic nonlinearity increases with plastic strain, and the second harmonic Rayleigh ultrasonic wave can be utilized for effective determination of yielding in Ti alloy. Our experiments further show that the acoustic nonlinearity increases gradually with plastic strain at small plastic strain level, and there is a more significant increase of acoustic nonlinearity when the plastic strain reaches a higher level. Microscopic investigations using scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM) are conducted for clarifying the relationship between the observed acoustic nonlinearity and micro-structural changes.

Original languageEnglish
Pages (from-to)41-47
Number of pages7
JournalMaterials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume669
DOIs
Publication statusPublished - 4 Jul 2016
Externally publishedYes

Keywords

  • Nonlinear ultrasonics
  • Piezoelectric transducer
  • Rayleigh wave
  • Titanium alloy
  • Yield

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