Ultrasonic Measurement of Elastic Properties of Nanostructured Alumina

Kim, Noh Yu; Kim, Hee Joon; Oh, Se Woong; Hozumi, N.; Lee, Cheol Kyou; Hong, Min Sung

doi:10.4028/www.scientific.net/KEM.321-323.1711

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Home Key Engineering Materials Advanced Nondestructive Evaluation IUltrasonic Measurement of Elastic Properties of...

Ultrasonic Measurement of Elastic Properties of Nanostructured Alumina

Abstract:

In this paper, elastic moduli of nanostructured alumina are evaluated by simultaneous measurement of longitudinal and shear wave velocities using mode-converted ultrasound in scanning acoustic microscope (SAM). Mode-converted longitudinal and shear waves inside alumina sample are captured to calculate acoustic wave velocities and determine elastic constants such as Young’s modulus and Bulk modulus. Al2O3 nanostructured alumina samples are formed by compacting micro-sized Al2O3 powder with nano-sized Al2O3 powder from 10wt% to 50wt%, and tested by SAM to investigate elastic moduli. A correlation is found from experiment that the more percentage of nano-particles are added, the higher elastic moduli are obtained. It is also shown that the mode-converted ultrasound is sensitive enough to characterize mechanical modulus of nanostructured alumina quantitatively.

Info:

Periodical:

Key Engineering Materials (Volumes 321-323)

Main Theme:

Advanced Nondestructive Evaluation I

Edited by:

Seung-Seok Lee, Joon Hyun Lee, Ik Keun Park, Sung-Jin Song, Man Yong Choi

Pages:

1711-1714

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.321-323.1711

Citation:

N. Y. Kim et al., "Ultrasonic Measurement of Elastic Properties of Nanostructured Alumina", Key Engineering Materials, Vols. 321-323, pp. 1711-1714, 2006

Online since:

October 2006

Authors:

Noh Yu Kim, Hee Joon Kim, Se Woong Oh, N. Hozumi, Cheol Kyou Lee, Min Sung Hong

Keywords:

Elastic Property, Mode Conversion, Scanning Acoustic Microscopy (SAM), Sintered Alumina, Ultrasonic Wave Velocities

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Price:

$38.00

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References

[1] E. Drescher-Krasicka and C.P. Ostertag, Residual Steel Measurements in Welded Steel Beam Column Connections by SAM, Journal of material Science(1999), Vol. 34, pp.4173-4179.

[2] N. Kim et al., Ultrasonic characterization of Elastic Moduli using defocused scanning acoustic microscopy, 2004 Japan-Korea Joint Workshop on Advanced Semiconductor Processes and Equipments(2004), Unzen, Japan, Nov. 18-20.

[3] S.W. Oh, H. Muto, K. Muramoto, et. al., Sintering behavior of microstructured γ-alumina with nanosized γ-alumina additive, 2004 Japan-Korea Joint Workshop on Advanced Semiconductor Processes and Equipments(2004), Unzen, Japan, Nov. 18-20.

DOI: https://doi.org/10.4028/www.scientific.net/kem.317-318.7

Paper TitlePages

Sintering and Mechanical Properties of Alumina Ceramics Prepared by Nanosize Alumina

Authors: Indra, S.W. Oh, Hee Joon Kim

Abstract: This work examined the mechanical properties of alumina that can directly be enhanced by ratio of nano sized alumina powders additives to micro size alumina powders (n/m ratio). These new materials have mechanical properties that are strongly grain size dependent and often significantly different from those of their coarser grained counter parts. The mechanical characteristics of samples were observed by using the indentation test system. This data shows that the relative density for the sample is increased with increasing Meyer hardness.

821

High Temperature Elastic Properties of Refractory Materials

Authors: Mahdi Ghassemi Kakroudi, Shahin Khameneh Asl

Abstract: A pulse-echo technique, based on ultrasonic "long-bar" mode (LBM) velocity measurements, working up to 1700°C is described. Magnetostrictive transducers and ultrasonic lines used in a 40-350 kHz frequency range are detailed. The conditions of choice of fundamental parameters (frequency, line geometry, sample size) are discussed in relation with the nature and the microstructure of the materials under test. This technique can be used to study the variations of elastic moduli of materials at high temperature.

On the Measurement of Dynamic Elastic and Internal Friction Properties of Nickel Based Super Alloys up to 650°C Temperature

Authors: K. Saravanan, V.M.J. Sharma, P. Ramesh Narayanan, S.C. Sharma, Koshy M. George

Abstract: Elastic constants are the fundamental key parameters to understand the mechanical behaviour of engineering materials under stressed condition. This paper explains the test methodology and provides results of experiments carried out using resonance based high temperature impulse excitation technique test facility for the measurement of technical elastic moduli i.e., Young’s modulus (E), Shear modulus (G), Poisson’s ratio (ν) and internal friction (Q^-1) of two nickel-base polycrystalline super alloys IN718 and Haynes 214 from ambient to 650°C temperature in argon environment during heating and cooling.

203

Young’s Modulus of Alumina Particles Reinforced Metal-Matrix Composite

Authors: Petr Haušild, Ondřej Kovářík, Kristýna Havlíková, Martina Thomasová

Abstract: Young’s modulus of alumina particles reinforced pure Al-matrix composite is characterized by different methods: the pulse-echo ultrasound method, static three point bending, resonant bending and continuous multicycle measurement by instrumented indentation. Dependency of apparent Young’s modulus on loading amplitude was observed and attributed to the local mechanical properties of both phases, especially to the development of internal damage (local plasticity and particle cracking).

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