Micromechanical Properties of Biocemented Shale Soils Analyzed Using Nanoindentation Test

The micromechanical properties at bonded Au ball bonds that have undergone three different time intervals of high temperature storage (HTS) have been characterised by using nanoindentation test. 12 indentations have been made at three different locations (Au, IMC and Si area) across the bonded ball bonds to evaluate the variation of hardness with the location of indentation. It was observed that each of the elements and compound that located at the bonded ball bonds exhibit different responses and micromechanical properties upon the nanoindentation tests. Au showed the highest creep behaviour compared to that of IMC and Si. It was observed that the plastic deformation response for Au and IMC were represented in load versus depth profile through the multiple pop-in events that exhibited in loading-unloading curve of Au and IMC. Finally, it was found that the hardness value and the tendency to brittle fracture of IMC were increased with the increment of the HTS time interval.

Download Full-text

AUTOMATIC SYSTEM FOR MICROMECHANICAL PROPERTIES ANALYSIS

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19815174 ◽

1981 ◽

Vol 42 (C5) ◽

pp. C5-1129-C5-1134

Author(s):

S. Etienne ◽

J. Y. Cavaille ◽

J. Perez ◽

M. Salvia

Keyword(s):

Automatic System ◽

Micromechanical Properties

Download Full-text

An optomechanogram: co-registered microstructural and micromechanical properties of the cervix

10.26226/morressier.5f5f8e69aa777f8ba5bd5f9c ◽

2020 ◽

Author(s):

Amir Ostadi Moghaddam

Keyword(s):

Micromechanical Properties

Download Full-text

Interfacial Bonding Behavior of Stainless Steel / Carbon Steel in Cold Rolling Process

Materials Science Forum ◽

10.4028/www.scientific.net/msf.982.121 ◽

2020 ◽

Vol 982 ◽

pp. 121-127

Author(s):

Shuo Li ◽

Qing Dong Zhang

Keyword(s):

Stainless Steel ◽

Carbon Steel ◽

Great Influence ◽

Rolling Process ◽

Interfacial Bonding ◽

304 Stainless Steel ◽

Nanoindentation Test ◽

Real Contact Area ◽

Steel Matrix ◽

Bonding Quality

A cylindrical indenter was designed to simulate the roller and 304 stainless steel / Q235A carbon steel plate with different roughness were bonded together. The interfacial bonding behavior was investigated by SEM, ultrasonic “C” scanning detection and nanoindentation test. The result reveal that with the increase of contact pressure between interfaces, the atoms of dissimilar metals begin to diffuse across interfaces in some regions, then form island-like bonding regions, and eventually extend to the whole interface. There are no obvious cracks on the surface of stainless steel and carbon steel after deformation. The cold roll-bonding mechanism of stainless steel and carbon steel is that elements on both sides of the interface diffuse and form a shallow diffusion layer under pressure to ensure the joint strength, and the joint bonding strength is greater than the strength of carbon steel matrix. In addition, the surface morphology of base metal has a great influence on the interfacial bonding quality. The higher surface roughness values increases the hardening degree of rough peak, which makes real contact area difficult to increase and reduce the interfacial bonding quality.

Download Full-text

Investigation of the Wear Behavior of PVD Coated Carbide Tools during Ti6Al4V Machining with Intensive Built Up Edge Formation

Coatings ◽

10.3390/coatings11030266 ◽

2021 ◽

Vol 11 (3) ◽

pp. 266

Author(s):

M.S.I. Chowdhury ◽

B. Bose ◽

S. Rawal ◽

G.S. Fox-Rabinovich ◽

S.C. Veldhuis

Keyword(s):

Tool Wear ◽

Titanium Alloys ◽

Wear Behavior ◽

Cutting Temperature ◽

Ti6al4v Alloy ◽

Adhesive Interaction ◽

Heavy Load ◽

Micromechanical Properties ◽

Rough Turning ◽

Coated Carbide

Tool wear phenomena during the machining of titanium alloys are very complex. Severe adhesive interaction at the tool chip interface, especially at low cutting speeds, leads to intensive Built Up Edge (BUE) formation. Additionally, a high cutting temperature causes rapid wear in the carbide inserts due to the low thermal conductivity of titanium alloys. The current research studies the effect of AlTiN and CrN PVD coatings deposited on cutting tools during the rough turning of a Ti6Al4V alloy with severe BUE formation. Tool wear characteristics were evaluated in detail using a Scanning Electron Microscope (SEM) and volumetric wear measurements. Chip morphology analysis was conducted to assess the in situ tribological performance of the coatings. A high temperature–heavy load tribometer that mimics machining conditions was used to analyze the frictional behavior of the coatings. The micromechanical properties of the coatings were also investigated to gain a better understanding of the coating performance. It was demonstrated that the CrN coating possess unique micromechanical properties and tribological adaptive characteristics that minimize BUE formation and significantly improve tool performance during the machining of the Ti6Al4V alloy.

Download Full-text