Performance of fine-grained W/Cu plate prepared by explosive welding with high wave impedance confinement at room temperature

2021 ◽  
Vol 172 ◽  
pp. 112855
Author(s):  
Qichao Tian ◽  
Yuling Sun ◽  
Honghao Ma ◽  
Yang Zhao ◽  
Zhaowu Shen ◽  
...  
Keyword(s):  
Explosive Welding ◽  
Room Temperature ◽  
Wave Impedance ◽  
High Wave ◽  
Fine Grained

Development of Toughened, Fine Grained, Recrystallized W-1.1%TiC

2021 ◽  
Vol 1024 ◽  
pp. 103-109
Author(s):  
Shunsuke Makimura ◽  
Hiroaki Kurishita ◽  
Koichi Niikura ◽  
Hun Chea Jung ◽  
Hiroyuki Ishizaki ◽  
...  
Keyword(s):  
Melting Point ◽  
Low Temperature ◽  
Fracture Strength ◽  
Room Temperature ◽  
Target Material ◽  
High Density ◽  
High Melting ◽  
High Melting Point ◽  
Irradiation Embrittlement ◽  
Fine Grained

Tungsten (W) is a principal candidate as target material because of its high density and extremely high melting point. W inherently has a critical disadvantage of its brittleness at around room temperature (low temperature brittleness), recrystallization embrittlement, and irradiation embrittlement. TFGR (Toughened, Fine Grained, Recrystallized) W-1.1%TiC has been considered as a realized solution to the embrittlement problems. We started to fabricate TFGR W-1.1%TiC in 2016 under collaboration between KEK and Metal Technology Co. LTD (MTC). The TFGR W-1.1%TiC samples were successfully fabricated in June, 2018. As a result, the specimen showed slight bend ductility and 2.6 GPa of fracture strength.

A thermal and X-ray investigation of scarbroite

1960 ◽  
Vol 32 (248) ◽  
pp. 353-362 ◽  
Author(s):  
W. J. Duffin ◽  
J. Goodyear
Keyword(s):  
Electron Diffraction ◽  
Chemical Analysis ◽  
Diffraction Data ◽  
Room Temperature ◽  
Layer Structure ◽  
Electron Diffraction Data ◽  
X Ray ◽  
Fine Grained ◽  
The North

SummaryScarbroite, a fine-grained but compact deposit obtained from fissures in the sandstone on the north Yorkshire coast, is shown by chemical analysis to have an idealized formula Al2(CO3)3·12Al(OH)3. X-ray and electron diffraction data indicate a triclinic cell with a 9·94 Å., b 14·88 Å., c 26·47 Å., α 98·7°, β 96·5°, and γ 89·0°. A layer structure consisting of gibbsite-type sheets of Al(OH)3 and sheets of Al2(CO3)3 is proposed. The structure is stable from room temperature to about 125° C.

Ultra-Fine Grained Al-SiC Metal Matrix Composite by Rotary Swaging Process

2011 ◽  
Vol 702-703 ◽  
pp. 320-323 ◽  
Author(s):  
Sivaswamy Giribaskar ◽  
Gouthama ◽  
Rajesh Prasad
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Room Temperature ◽  
Volume Fraction ◽  
Second Phase ◽  
Fine Grained ◽  
Rotary Swaging ◽  
Sic Particles ◽  
Dynamic Recrystallisation

In present study microstructural evolution during swaging on aluminium alloy based metal matrix composite (MMC) reinforced with 15% volume fraction silicon carbide (SiC) particles is presented. Samples were swaged at room temperature in steps with reducing die dimensions using rotary swaging technique. SEM and TEM are used to study the microstructural characteristics of swaged samples. SEM observations were made to understand the flow and deformation characteristics of deforming aluminium matrix in the presence of second phase and reinforced SiC particles during swaging. TEM observations on swaged samples confirmed the formation of ultra-fine grains in Al-15%SiC MMC. It is shown that the dynamic recrystallisation occurring in the proximities of second phase particles during the deformation at room temperature, leads to very fine grained microstructure.

Tensile Deformation Behaviors in a Fine-Grained, Rolled Mg-3Al-3Sn Alloy at Room Temperature up to 250 °C

2014 ◽  
Vol 17 (2) ◽  
pp. 199-204 ◽  
Author(s):  
Xiao-Long Nan ◽  
Hui-Yuan Wang ◽  
Jian Rong ◽  
En-Song Xue ◽  
Guo-Jun Liu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Tensile Deformation ◽  
Fine Grained ◽  
Deformation Behaviors

Superplasticity of Ultra-Fine Grained 7075 Alloy Processed by High-Pressure Torsion

2014 ◽  
Vol 794-796 ◽  
pp. 807-810 ◽  
Author(s):  
Seungwon Lee ◽  
Zen Ji Horita
Keyword(s):  
High Pressure ◽  
Room Temperature ◽  
High Pressure Torsion ◽  
Applied Pressure ◽  
Tensile Tests ◽  
Initial Strain ◽  
Strain Rates ◽  
Fine Grained ◽  
Al 7075 ◽  
7075 Alloy

An Al 7075 alloy (5.63mass%Zn-2.56mass%Mg-1.68mass%Cu-0.21mass%Fe-0.19mass%Cr-0.14mass%Si-0.02mass%Ti with balance of Al) was processed by high-pressure torsion (HPT) under an applied pressure of 6 GPa for 1, 3 and 5 revolutions with a rotation speed of 1 rpm at room temperature. Vickers microhardness saturated to a level of 220 Hv after the HPT processing and the grain size was refined to 120 nm at the state of the hardness saturation. Tensile tests were conducted with initial strain rates from 2.0 × 10-4 to 2.0 × 10-2 s-1 at temperatures as 200 °C and 250 °C (equivalent to 0.52Tm and 0.57Tm, respectively, where Tm is the melting point of the alloy). The HPT-processed samples for 3 revolutions exhibited superplastic elongations of 640% and 510% at 250 °C with initial strain rates of 2.0 × 10-3 s-1 and 2.0 × 10-2 s-1, respectively.

Deformation behavior at room temperature ranges of fine-grained Mg–Mn system alloys

2019 ◽  
Vol 766 ◽  
pp. 138384 ◽  
Author(s):  
Hidetoshi Somekawa ◽  
Dudekula Althaf Basha ◽  
Alok Singh
Keyword(s):  
Deformation Behavior ◽  
Room Temperature ◽  
Fine Grained ◽  
Temperature Ranges

scholarly journals Room temperature yielding phenomenon in extruded or/and aged Mg-14Gd-2Ag-0.5Zr alloy with fine-grained microstructure

2020 ◽  
Vol 787 ◽  
pp. 139551 ◽  
Author(s):  
R.G. Li ◽  
D.Y. Zhao ◽  
J.H. Zhang ◽  
H.R. Li ◽  
Y.Q. Dai ◽  
...  
Keyword(s):  
Room Temperature ◽  
Fine Grained

Observation of slip propagation across grain boundaries in Ni3Al

1986 ◽  
Vol 44 ◽  
pp. 864-865 ◽  
Author(s):  
I. Baker ◽  
E.M. Schulson ◽  
J.A. Horton
Keyword(s):  
Grain Size ◽  
Yield Strength ◽  
Room Temperature ◽  
Size Dependence ◽  
Direct Evidence ◽  
Specimen Preparation ◽  
Fine Grained ◽  
Room Temperature Yield Strength ◽  
Pile Up ◽  
Preparation Techniques

Recent modelling of the grain size dependence of the room-temperature yield strength of Ni3Al has invoked the concept of dislocation pile-ups. The idea is that the yield strength measured in the Liiders regime (i.e. the Liiders band propagation stress) represents not the stress to independently nucleate slip in each grain but the stress required to propagate slip through the material. This paper presents direct evidence of slip propagation from one grain to the next and thus validation of the use of a pile-up model for Ni3Al.Miniature tensile specimens (3 mm x 7 mm x0.2 mm), made from an extruded rod of fine-grained (∽10 μm) Ni3Al containing 0.35 at.% boron, were strained under tension whilst being observed in a Philips EM 430T operated at 300 KV. Details of the design and operation of the straining stage and of the specimen preparation techniques are given elsewhere.

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