Nanoindentation study of electrodeposited Ag thin coating: An inverse calculation of anisotropic elastic-plastic properties

Cheng, Guang; X, Sun; Wang, Yuxin; Tay, See Leng; Gao, Wei

doi:10.1016/j.surfcoat.2016.12.056

Cited by 41 publications

(23 citation statements)

References 61 publications

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“…3, it can be seen that the results of the 10 measurements on the original coating, especially during loading, were more homogenous than those on the thermally aged coating. It has been reported that differences in surface roughness lead to dispersion of loading curves [37]. However, in this study, the original and thermally aged coatings had similar surface roughness values, and so, the large dispersion of the loaddisplacement curves for the thermally aged coating was caused by other factors.…”

Section: Study Of Mechanical Propertiescontrasting

confidence: 50%

Characterizations of thermal stability and electrical performance of Au-Ni coating on CuCrZr substrate for high vacuum radio-frequency contact application

et al. 2018

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Radio-frequency (RF) contacts-which are an example of electrical contacts-are commonly employed on accelerators and nuclear fusion experimental devices. RF contacts with a current load of 2 kA for steady-state operation were designed for application to the International Thermonuclear Experimental Reactor (ITER) device. In contrast to the typical working conditions of general commercial electrical contacts, those of RF contacts employed on fusion devices include high vacuum, high temperature, and neutron radiation. CuCrZr is currently of interest as a base material for the manufacture of louvers of RF contacts, which has excellent thermal and electrical properties and has low creep rate at 250 °C. In this study, a hard Au coating (Au-Ni) was electroplated on CuCrZr samples and the samples were then subjected to thermal aging treatment at 250 °C for 500 h in order to simulate the vacuum-commissioning process of the ITER. The effects of thermal aging on the hardness, elastic modulus, crystallite size, and compositions of the coating were investigated via microstructural and mechanical characterizations of the coating material. Metal atom migration in different coating layers during thermal aging was characterized and evaluated via scanning electron microscopy/energy dispersive X-ray spectroscopy observations of the cross-sectional surfaces, and the obtained results could be used to directly select the coating thickness for the final RF contact component. The contact resistance-an important parameter of the RF contact-was measured in a dedicated testbed built to simulate fusion reactor conditions between CuCrZr pins and stainless steel plates coated with Au-Ni and Rh, respectively.

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Section: Study Of Mechanical Propertiescontrasting

confidence: 50%

Characterizations of thermal stability and electrical performance of Au-Ni coating on CuCrZr substrate for high vacuum radio-frequency contact application

et al. 2018

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“…For example, the stiffness of a Cu thin film was observed to increase as the film thickness decreased due to the increase of <111> fiber texture component [21]. Similarly, the anisotropic elastic-plastic properties of the electrodeposited Ag thin coating were recognized by nanoindentation testing on the longitudinal and transverse directions of the coating surfaces [22]. It was reported, however, that the elastic modulus measured by a cantilever microbeam test was close to that in the parallel direction to the film surface [23].…”

Section: Discussionmentioning

confidence: 97%

A Comparative Study on the Elastic Characteristics of an Aluminum Thin-Film Using Laser Optical Measurement Techniques

2017

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Abstract:The increase of a surface area-to-volume ratio with the reduction of material dimensions significantly alters the characteristics of materials from their macroscopic status. Therefore, efforts have been made to establish evaluation techniques for nanoscale films. While contact mechanics-based techniques are conventionally available, non-contact and nondestructive methods would be preferable in case damages left on a sample after testing are not desirable, or an in situ assessment is required. In the present study, the Young's modulus of an aluminum thin-film was evaluated using two different laser optical measurement techniques. First, microscale beam testing has been performed so that the resonant frequency change of a microfabricated cantilever beam induced by coating of a 153 nm thick aluminum layer on its top surface can be detected using a laser interferometer in order to evaluate the mechanical property through modal analysis using the finite element method. Second, picosecond ultrasonics were employed for cross-verification so that the mechanical characteristics can be evaluated through the investigation of the longitudinal bulk wave propagation behavior. Results show that the Young's moduli from both measurements agree well with each other within 3.3% error, proving that the proposed techniques are highly effective for the study of nanoscale films.

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“…Contohnya, nilai kekerasan dan modulus Young dapat diperoleh daripada beban maksimum dan permulaan cerun pembebanan seperti yang dicadangkan oleh Oliver dan Pharr (2004). Ujian pelekukan nano juga telah digunakan untuk menentukan modulus Young dan kekerasan filem nipis, perubahan mikrostruktur dan bahan pukal (Cheng et al 2017). Kajian oleh Chen et al (2015) telah menggunakan ujian pelekukan nano untuk mengkaji sifat mekanik struktur sambungan pateri, pateri pukal dan keadaan selepas pematerian.…”

Section: Pengenalanunclassified

Kesan Gelombang Kejutan terhadap Sifat Mikromekanik Sambungan Pateri SAC 0307/ENiG menggunakan Pendekatan Pelekukan Nano

Bakar¹,

Jalar²,

Yusoff³

et al. 2019

JSM

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Kebolehharapan dan kebolehtahanan pempakejan elektronik bagi peralatan elektronik dalam bidang ketenteraan adalah menjangkaui kepenggunaan komersial. Kebolehharapan sambungan pateri merupakan perkara asas bagi penilaian prestasi pempakejan elektronik. Ujian kebolehharapan komersial atau konvensional seperti dalam standard JEDEC (Solid State Technology Association) tidak dapat memenuhi keperluan pempakejan elektronik untuk piawaian ketenteraan. Kajian ini melaporkan gerak balas sambungan logam pateri SAC 0307 pada papan litar bercetak (PCB) dengan kemasan permukaan electroless nickel immersion gold (ENiG) terhadap gelombang kejutan hasil daripada ujian letupan secara terbuka. Perubahan sifat mikromekanik dikaji menggunakan pendekatan pelekukan nano. Gelombang kejutan yang berbeza dikenakan pada sambungan pateri dengan menggunakan bahan Emulex dengan dos sebanyak 700 g dan 1500 g. Kekerasan sambungan pateri telah menyusut sebanyak 29% daripada 141 MPa kepada 100 MPa selepas didedahkan pada gelombang kejutan dengan penggunaan dos Emulex sebanyak 1500 g. Modulus terkurang sambungan pateri juga telah menyusut sebanyak 13% daripada 141 GPa kepada 123 GPa dengan penggunaan dos bahan Emulex sebanyak 1500 g. Ujian gelombang kejutan telah menyebabkan berlakunya perubahan pada sifat mikromekanik sambungan pateri iaitu berlakunya kelakuan perlembutan yang melibatkan penyusutan nilai kekerasan dan modulus terkurang. Tiada retak diperhatikan pada antara sambungan pateri-substrat yang menunjukkan bahawa sambungan pateri adalah tidak gagal dan tetap utuh selepas didedahkan pada gelombang kejutan yang tinggi, walaupun berlaku penyusutan sifat mikromekanik yang ketara.

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Nanoindentation study of electrodeposited Ag thin coating: An inverse calculation of anisotropic elastic-plastic properties

Cited by 41 publications

References 61 publications

Characterizations of thermal stability and electrical performance of Au-Ni coating on CuCrZr substrate for high vacuum radio-frequency contact application

Characterizations of thermal stability and electrical performance of Au-Ni coating on CuCrZr substrate for high vacuum radio-frequency contact application

A Comparative Study on the Elastic Characteristics of an Aluminum Thin-Film Using Laser Optical Measurement Techniques

Kesan Gelombang Kejutan terhadap Sifat Mikromekanik Sambungan Pateri SAC 0307/ENiG menggunakan Pendekatan Pelekukan Nano

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