Effect of annealing on microstructure, texture and hardness of ITER-specification tungsten analyzed by EBSD, vickers micro-hardness and nano-indentation techniques

2019 ◽  
Vol 524 ◽  
pp. 191-199 ◽  
Author(s):  
L. Tanure ◽  
A. Bakaeva ◽  
A. Dubinko ◽  
D. Terentyev ◽  
K. Verbeken
Keyword(s):  
Micro Hardness ◽  
Nano Indentation ◽  
Vickers Micro Hardness

Evaluation of the Resistance of Individual Si Die to Cracking

1998 ◽  
Author(s):  
R. Berriche ◽  
R.K. Lowry ◽  
M.I. Rosenfield
Keyword(s):  
Thermal Cycling ◽  
Hardness Test ◽  
Mechanical Stresses ◽  
Test Method ◽  
Processing Conditions ◽  
Micro Hardness ◽  
Test Methodology ◽  
Vickers Micro Hardness

Abstract The present work investigated the use of the Vickers micro-hardness test method to determine the resistance of individual die to cracking. The results are used as an indicator of resistance to failure under the thermal and mechanical stresses of packaging and subsequent thermal cycling. Indentation measurements on die back surfaces are used to determine how changes in wafer backside processing conditions affect cracks that form around impressions produced at different loads. Test methodology and results obtained at different processing conditions are discussed.

scholarly journals Microstructure and Hardness of Scandium Trialuminide with Ternary Rare-Earth Additions

2007 ◽  
Vol 539-543 ◽  
pp. 1565-1570 ◽  
Author(s):  
Yoshihisa Harada ◽  
David C. Dunand
Keyword(s):  
Solid Solution ◽  
Rare Earth ◽  
Lattice Parameter ◽  
Second Phase ◽  
Micro Hardness ◽  
Size Mismatch ◽  
Atomic Size ◽  
Rare Earth Additions ◽  
Re Elements ◽  
Vickers Micro Hardness

The microstructure of ternary Al3(Sc1-yREy) intermetallic compounds (where RE is one of the rare-earth elements La, Ce, Nd, Sm, Eu, Yb or Lu), was investigated as a function of RE concentration for 0<y≤0.75. Alloys with La, Ce, Nd, Sm or Eu additions consist of a L12 phase containing a dendritic second phase with D019 (La, Ce, Nd, Sm) or C11b (Eu) structure. Alloys with Yb or Lu additions show a single L12 phase. The RE solubility limits at 1373 K in the L12-Al3(Sc1-yREy) phase are very low for La, Nd, Ce and Eu (0.08-0.41 at.% or y=0.0032-0.0164), low for Sm (3.22 at.% or y=0.1288) and complete for Yb and Lu. The lattice parameter of the L12 solid-solution increases linearly with RE concentration and the magnitude of this effect is correlated with the atomic size mismatch between Sc and the RE elements. The Vickers micro-hardness of the L12 solid-solution increases linearly with increasing RE concentration.

Development of Titanium-Calcium Alloy Resistant to Aqueous Fluoride Solutions

2010 ◽  
Vol 638-642 ◽  
pp. 564-569 ◽  
Author(s):  
Takumi Haruna ◽  
Itsuki Shinohara
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Oxide Layer ◽  
Metal Layer ◽  
Holding Time ◽  
The Other ◽  
Fluoride Ion ◽  
Micro Hardness ◽  
Immersion Condition ◽  
Vickers Micro Hardness

It has been tried to develop Ti-Ca alloys which demonstrates corrosion resistance in an aqueous fluoride solutions. The Ti-Ca alloys were produced by diffusion-metallizing method. A Ti plate and Ca grains were put in a sealed container of stainless steel. As the container was heated at 1000 oC, Ca was melted and partially vaporized in the inner space. Ca then contacts and permeats into the Ti plate to metallize. In a holding time of 450 h, the alloy surface consisted of two layers, the first was oxide layer and the second was metal layer of about 200 m thick. A Vickers micro hardness of the second layer was quite large, upto about 600 Hv. Evaluation of corrosion resistance for the second layer and the inner part was carried out by electrochemical potentiokinetic method. Test solutions were aqueous fluoride solutions produced with HF and NaF. A concentration of fluoride ion was fixed to 0.024 kmol m-3, and pH of the solution was varied from 3.4 to 4.7. As a result, both Ti and Ti-Ca alloy were passivated under natural immersion condition in the solution of pH 4.7. At pH 3.4, on the other hand, Ti was actively dissolved, but Ti-Ca alloy was still passivated, that means Ti-Ca alloy performs much better corrosion resistance than Ti.

Tem Investigation and Hardness Improvement of A N+ Implanted Al-Alloy

1995 ◽  
Vol 400 ◽  
Author(s):  
A.M. Serventi ◽  
M. Vittori Antisari ◽  
L. Guzman ◽  
A. Miotello
Keyword(s):  
Ion Beam ◽  
Al Alloy ◽  
Micro Hardness ◽  
Cross Sectional ◽  
Hardness Tests ◽  
First Results ◽  
Different Temperatures ◽  
Nitrogen Ion ◽  
A Current ◽  
Vickers Micro Hardness

AbstractThe surface modification induced by nitrogen ion implantation on the Al-alloy 7075 has been studied with the aim of understanding the microstructural evolution and the phase separation during the implantation process. 150 keV N2+ ions have been implanted at different temperatures from 373 K to 473 K, with a current density of 5–15 µA/cm2 on previously polished samples. The implanted dose was in the range 1 × 1017 N/cm2 - 5 × 1017 N/cm2. Vickers micro-hardness tests and friction coefficient measurements show a real improvement in the mechanical behaviour of the alloy after the treatment.TEM observations of specimens treated at low temperature with different ion dose have been carried out at 200 kV on cross-sectional samples, prepared by ion beam milling. First results show the presence of small AlN hexagonal precipitates whose evolution is followed as a function of the implanted dose.

Characterisation of WC-17Co and WC-9Ni HVOF Sprayed Cermet Coatings

2016 ◽  
Vol 840 ◽  
pp. 331-335
Author(s):  
Nur Amira Mohd Rabani ◽  
Zakiah Kamdi
Keyword(s):  
Steel Substrate ◽  
Optical Microscope ◽  
Binder Phase ◽  
High Porosity ◽  
Tungsten Carbides ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hardness Tester ◽  
Vickers Micro Hardness

Cemented tungsten carbides have been paid much attention due its better mechanical properties with excellent combination of hardness and toughness characteristics. The hard WC particles in the coating provide hardness and wear resistance, while the ductile binder such as Co and Ni contribute to toughness and strength. WC-17wt.% Co and WC-9wt.% Ni powders have been sprayed by the HVOF method to form coatings approximately 300μm and 150μm thick onto AISI 1018 steel substrate. Both coatings have been prepared and supplied by an external vendor. The coatings were examined using optical microscope (OM), scanning electron microscope (SEM), and X-Ray diffraction (XRD). The hardness of both coatings were also measured using Vickers micro-hardness tester. The microstructure of the coatings has been analyzed and found to consist of WC, brittle W2C phase, metallic W phase, and amorphous binder phase of Co and Ni. It is found that WC-Ni has a higher hardness value compared to WC-Co due to high porosity distribution.

Vickers micro-hardness of solid solution in the system Cr2O3-Al2O3

1980 ◽  
Vol 15 (5) ◽  
pp. 1314-1316 ◽  
Author(s):  
K. Shinozaki ◽  
Y. Ishikura ◽  
K. Uematsu ◽  
N. Mizutani ◽  
M. Kato
Keyword(s):  
Solid Solution ◽  
Micro Hardness ◽  
Vickers Micro Hardness

scholarly journals EFFECT OF DEPOSITION PARAMETERS ON MICROSTRUCTURE AND TRIBOLOGICAL PROPERTIES OF HARD CA-PVD MULTICOMPONENT TiAlCrN AND TiAlCrCN COATINGS

2020 ◽  
pp. 123-126
Author(s):  
I.O. Misiruk ◽  
O.I. Tymoshenko ◽  
V.S. Taran ◽  
A.V. Taran ◽  
S.P. Romaniuk ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Vacuum Arc ◽  
Micro Hardness ◽  
Deposition Parameters ◽  
430 Stainless Steel ◽  
Evaporation Technique ◽  
Arc Evaporation ◽  
Tribomechanical Properties ◽  
Aisi 430 ◽  
Vickers Micro Hardness

Multicomponent TiAlCrN and TiAlCrCN coatings were deposited using vacuum arc evaporation technique on AISI 430 stainless steel. The influence of working gas pressure, C/N ratio, bias voltage on the structure and tribomechanical properties of the obtained coatings has been studied. The surface morphology, chemical compound of the coatings obtained under the various conditions has been analyzed by SEM with EDX, XRD, and XRF analysis. The dry wear pad-on-disc tests against 100Cr6 counterbody at 20 N load have been carried out. It was established that Vickers micro-hardness was varied from 26 to 41 GPa depending on deposition parameters.

Strain Hardening in Polycrystalline and Nanocrystalline Nickel

2011 ◽  
Vol 409 ◽  
pp. 550-554 ◽  
Author(s):  
B.T.F. Tang ◽  
Uwe Erb ◽  
I. Brooks
Keyword(s):  
Grain Size ◽  
Strain Hardening ◽  
Bulk Material ◽  
Micro Hardness ◽  
Polycrystalline Nickel ◽  
Nanocrystalline Nickel ◽  
Indentation Analysis ◽  
Hardness Values ◽  
Vickers Micro Hardness ◽  
Considerable Strain

The work hardening behavior of electrodeposited nanocrystalline (grain size: 100 nm) and fully annealed polycrystalline nickel (grain size: 160 µm) was examined by hardness indentation analysis. First, plastic strain was introduced into the materials through large Rockwell hardness indentations. A series of Vickers micro-hardness traces below and away from the Rockwell indentation then measured the change in hardness as a function of distance from the plastic zone. The results showed that polycrystalline nickel exhibited considerable strain hardening, with micro-hardness values closest to the Rockwell indentation averaging twice the hardness value of the bulk material. On the other hand, for the nanocrystalline nickel the Vickers micro-hardness values changed only by a few percent indicating a limited strain hardening capacity.

Sign in / Sign up

Export Citation Format

Share Document