Microstructure – Mechanical Properties Relationship of Laser Interference Irradiated Ni/Al Multi-Film

2003 ◽  
Vol 795 ◽  
Author(s):  
C. Daniel ◽  
A. Lasagni ◽  
F. Mücklich
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Intermetallic Compounds ◽  
Physical Vapor Deposition ◽  
Thermal Simulation ◽  
Laser Interference ◽  
Structural Investigations ◽  
Relationship Of ◽  
Layered Thin Film ◽  
Made In

ABSTRACTDue to the corresponding intermetallic compounds, Ni/Al multi-layered thin film systems are important to protect against the mechanical and chemical impacts on the bulk component. The mechanical properties of these intermetallic compounds, NiAl, can be further improved by combining with other stiff phases. The mechanical properties would be optimized if the lateral surface composite can be made in such a way that the different phases are arranged periodically with a preferred orientation, micro-scaled period and reticulated phase interfaces. Such optimized surface composites have been achieved by laser interference irradiation in a nano-grained structure.In this study, the thin film systems are produced by physical vapor deposition and subsequently irradiated by the interference pattern of two or more coherent laser beams. The corresponding periodical heat treatment has been analyzed by thermal simulation, and thermal simulation results are compared with the experimental results. Further, the phase transitions during laser interference irradiation are calculated. The structural investigations of irradiated films - grain sizes and deformation by TEM, stress and texture by XRD - are compared with the mechanical properties - hardness and Young's modulus by NI-AFM.

Effect of the Mechanical Properties and Geometric Parameters on the Crack Density of a Multi-Layered Thin Film Structure under Residual Tensile Stress

2014 ◽  
Vol 543-547 ◽  
pp. 1533-1536
Author(s):  
Ban Quan Yang ◽  
Xue Jun Chen ◽  
Wei Hai Sun ◽  
Hong Qian Chen ◽  
Jing Wen Pan ◽  
...  
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Tensile Stress ◽  
Fracture Behavior ◽  
Crack Density ◽  
Film Structure ◽  
Geometric Parameters ◽  
Residual Tensile Stress ◽  
Thin Film Structure ◽  
Layered Thin Film

The effect of the mechanical properties and geometric parameters on the crack density of a multi-layered thin film structure under residual tensile stress is investigated theoretically. The numerical results show that the crack density of the thin film decreases with the increase of the thickness of the thin film and (or) the fracture strength of the thin film. These results can help us more deeply understand the fracture behavior of the multi-layered thin film structure under residual tensile stress.

Nondestructive Evaluation of Thin Film Microstructures by Picosecond Ultrasonics

1988 ◽  
Vol 142 ◽  
Author(s):  
Humphrey J. Maris ◽  
Holger T. Grahn ◽  
Jan Tauc
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Nondestructive Evaluation ◽  
Time Domain ◽  
Elastic Stress ◽  
Time Dependent ◽  
Ultrasonic Evaluation ◽  
Ultrasonic Measurements ◽  
Made In

AbstractWe describe a technique by which ultrasonic measurements can be made in the picosecond time domain. A light pulse (duration of the order of 0.1 psec) is absorbed at a surface, thereby setting up an elastic stress. This stress launches an elastic pulse into the interior. The propagation of this strain, including its reflection at interfaces within a microstructure, is monitored through measurements of the time-dependent changes of the optical reflectivity. These measurements are made using a time-delayed probe pulse. In these experiments the spatial length of the elastic pulses can be as short as 50 Å. We can therefore use this technique to perform a nondestructive ultrasonic evaluation of thin-film microstructures. We describe here results we have obtained which demonstrate the application of the method to the study of the mechanical properties of thin films, the geometry of microstructures, and the quality of bonding at interfaces.

scholarly journals Measurement of Effects of Different Substrates on the Mechanical Properties of Submicron Titanium Nickel Shape Memory Alloy Thin Film Using the Bulge Test

Micromachines ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 85
Author(s):  
Nhat Minh Dang ◽  
Zhao-Ying Wang ◽  
Ti-Yuan Wu ◽  
Tra Anh Khoa Nguyen ◽  
Ming-Tzer Lin
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Thermal Cycling ◽  
Shape Memory ◽  
Physical Vapor Deposition ◽  
Phase Changes ◽  
Bulge Test ◽  
Alloy Thin Film ◽  
Adhesion Layer ◽  
Titanium Nickel

This study investigated the effects of different substrates on the mechanical properties of Ti-60at%Ni shape memory alloys (SMA). Two types of samples were prepared for this experiment: (1) a Ti-60at%Ni deposited on SiNx, and (2) a Ti-60at%Ni deposited on SiNx/Cr; both had a 600 nm thick film of Ti-60at%Ni. Deposition was done using the physical vapor deposition (PVD) process, and the microstructural changes and crystallization phase changes were observed through scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the TiNi thin film with a Cr adhesion layer had better mechanical properties. The bulge test showed that TiNi thin film with a Cr adhesion had a higher Young’s modulus and lower residual stress. From the thermal cycling experiment, it was found that the Cr adhesion layer buffered the mismatch between TiNi and SiNx. Additionally, the thermal cycling test was also used to measure the thermal expansion coefficient of the films, and the fatigue test showed that the Cr layer significantly improved the fatigue resistance of the TiNi film.

Mechanical Properties of Pure Carbon and Carbonnitrogen Coatings on Thin Film Head Sliders

1996 ◽  
Vol 436 ◽  
Author(s):  
G. Wang ◽  
A. Strojny ◽  
J. M. Sivertsen ◽  
J. H. Judy ◽  
W. W. Gerberich
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Elastic Modulus ◽  
Carbon Films ◽  
Wear Protection ◽  
Pure Carbon ◽  
Wear Damage ◽  
Afm Micrographs ◽  
Better Than ◽  
Made In

AbstractThe mechanical properties of pure carbon (C) and carbon-nitrogen (C:N) coatings on thin film head sliders were investigated by continuous drag testing (CDT) and nano-indentation. Comparisons were made in terms of wear protection, elastic modulus and hardness of these two types of carbon films. The C and C:N thin films with various thickness were deposited on thin film head sliders using a facing target sputtering (FTS) system. After 23,000 revolutions of CDT tests, all the testing head sliders which were uncoated and coated with 90 Å C or C:N exhibited some degree of wear damage as indicated in AFM micrographs where that of the uncoated head was the most severe and that of the C:N coated head was the least. Head sliders coated with 1000Å C and C:N were studied under the TriboscopeTM nano-indenter, where load-displacement curves at different maximum loads were recorded. Elastic modulus and hardness were determined from those curves. The results show that elastic modulus and hardness of C:N are greater than that of C. Therefore, one may conclude that both C and C:N behave like a protective coating for the head slider where C:N is better than C, which could be well related to the larger elastic modulus and hardness of C:N.

Using Nanoindentation and Nanoscratch to Determine Thin Film Mechanical Properties

2006 ◽  
Vol 326-328 ◽  
pp. 357-360 ◽  
Author(s):  
Rwei Ching Chang ◽  
Feng Yuan Chen ◽  
Chang En Sun
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Mechanical Properties ◽  
Friction Factor ◽  
Young’S Modulus ◽  
Physical Vapor Deposition ◽  
Young's Modulus ◽  
Indentation Test ◽  
Lateral Force ◽  
Wafer Substrate

This work uses nanoindentation and nanoscratch to measure the mechanical properties of evaporation copper thin films. The thin film is deposited on a silicon wafer substrate by using the physical vapor deposition method provided by a resistive heating evaporator. The mechanical properties are then determined by indentation test and lateral force test produced by nanoindenter and nanoscratch. The results show that, as the copper thin film is 500nm in thickness and the indentation depth increases from 100nm to 400nm, the Young’s modulus increases from 151GPa to 160GPa while the hardness increases from 2.8GPa to 3.5GPa. Moreover, both the Young’s modulus and the hardness decrease as the thickness of the thin film increases. Besides, the nanoscratch results show that the friction factor also increases as the scratch depth increases, and a thinner film thickness makes a larger friction factor. The results represent the substrate has a significant effect on the mechanical properties of the thin films.

Mechanical Properties of Carbon Films for Thin Film Disks

1990 ◽  
Vol 188 ◽  
Author(s):  
Richard L. White ◽  
Mary F. Doerner ◽  
George W. Walker
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Argon Plasma ◽  
Carbon Films ◽  
Film Stress ◽  
Film Hardness ◽  
Residual Film ◽  
Frictional Performance ◽  
Curvature Measurements ◽  
Relationship Of

ABSTRACTCarbon overcoat films are used extensively in thin film disk applications to provide wear resistance. A nano-indentation technique and wafer curvature measurements have been used to study the mechanical properties of carbon films sputtered under various processing conditions. Specifically, the effects of substrate/target spacing, power, pressure, and substrate bias have been studied for films sputtered in an argon plasma. The relationship of these properties to contact start-stop performance of hydrocarbon lubricated disks is further described. The frictional performance during the test can be related to film hardness, while the durability can be affected by the residual film stress.

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