Investigation of Plastic Properties of Ø8 Rod Made of Fire-Refined Copper of Kmor Grade

2020 ◽  
Vol 989 ◽  
pp. 665-670 ◽  
Author(s):  
Yevgen Smyrnov ◽  
Vitalii Skliar ◽  
Aleksei Gorozhankin
Keyword(s):  
Room Temperature ◽  
Property Values ◽  
Cumulative Effect ◽  
Physical Property ◽  
Drawing Ratio ◽  
Process Variables ◽  
Plastic Properties ◽  
Ohmic Resistance ◽  
Metal Composition ◽  
Specific Elongation

Results of the comparative ductility evaluation of Ø8 rods made of copper of the KM and KMor grades are discussed. It has been found out that plastic properties of KM and KMor grade rods at room temperature practically do not differ in their specific elongation and after-fracture contraction indices. At the same time, the ductility indices of KMor rod at temperature +850 °С became, practically, half-values. Increased spread of physical property values particularly the specific ohmic resistance of the rod KMor can be explained by the cumulative effect of variations of the chemical metal composition, and changes in process variables of the process (for example, unstable density of a cast bar), that initiate an occurrence of tension stresses during rolling. Calculation data of the limiting drawing ratio μr demonstrated that its value must not exceed 1.475.

The Sensitivity of CVD Calculations to Physical Property Values

1985 ◽  
Vol 132 (8) ◽  
pp. 1932-1939 ◽  
Author(s):  
Helen Rebenne ◽  
Richard Pollard
Keyword(s):  
Property Values ◽  
Physical Property

The Effect of Process Variables on Extrusion Pressures of Lead

1959 ◽  
Vol 81 (3) ◽  
pp. 207-214 ◽  
Author(s):  
J. Frisch ◽  
E. G. Thomsen
Keyword(s):  
Room Temperature ◽  
Extrusion Ratio ◽  
Extrusion Pressure ◽  
White Lead ◽  
Cylinder Wall ◽  
Process Variables ◽  
Pure Lead ◽  
Commercially Pure ◽  
Wide Range

Billets of commercially pure lead, 2 in. diam × 3 in. long were extruded at room temperature through five different die contours at ram speeds up to 50 ipm. It was found that, for the direct and indirect extrusions, with good lubrication (white lead in oil) and with good cylinder-wall finish, the extrusion pressure-displacement diagrams were essentially the same. The concentric and eccentric single-bar and multibar extrusions at constant extrusion ratio required approximately the same pressures when extruded at identical speeds. The extrusion pressures over the wide range of speeds investigated showed approximate linearity when plotted on log-log co-ordinates.

The Thermal-Mechanical Behavior of Selected Si3N4 and SiC Ceramics

1996 ◽  
Author(s):  
Norman L. Hecht ◽  
Hongsang Rho ◽  
Nora R. Osborne ◽  
Dale E. McCullum ◽  
Steven M. Goodrich
Keyword(s):  
Mechanical Behavior ◽  
Room Temperature ◽  
Failure Mechanisms ◽  
Property Values ◽  
Heat Engine ◽  
Cyclic Fatigue ◽  
Sic Ceramics ◽  
Environment Temperature ◽  
Fatigue And Fracture

This paper presents the results of a long term program initiated in December of 1984 to investigate the effects of environment (temperature, atmosphere, and stress) on the mechanical behavior of eight Si3N4 and three SiC ceramics being considered for heat engine applications. Microstructure, chemistry, and physical properties were determined. The mechanical behavior of these materials was investigated from room temperature to 1400°C by employing tests for flexural and tensile strength, dynamic, static and cyclic fatigue, and fracture toughness. The results obtained from these evaluations showed that the thermal mechanical behavior was quite varied, depending on the composition and processing methods employed. Batch to batch differences were also found to cause variances in the property values measured. Insights gained from this work about the failure mechanisms and potential service life are also discussed.

X-Ray Diffraction Studies on the Titanium-Nickel System

1962 ◽  
Vol 6 ◽  
pp. 74-84
Author(s):  
John V. Gilfrich
Keyword(s):  
Heat Treatment ◽  
Room Temperature ◽  
Stoichiometric Composition ◽  
Physical Property ◽  
X Ray Diffraction ◽  
X Ray ◽  
Property Data ◽  
Before And After ◽  
Titanium Nickel ◽  
Physical Property Data

AbstractX-ray diffraction studies were made on the Ti–Ni system around the stoichiometric composition of the intermetallic compound TiNi to clarify some confusion which has existed about the phase diagram in this region, and to explain some anomalies in the physical properties of this material. Wrought and cast samples were examined at room temperature both before and after heat treatment and at temperatures both above and below ambient. The compound TiNi does exist at room temperature. The phase purity of the particular sample was found to be greatly affected by such factors as minor variations in composition, heat treatment, and method of sample preparation. Some confirming metallographlc and physical property data will also be presented.

scholarly journals Mineral Phase and Physical Properties of Red Mud Calcined at Different Temperatures

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Chuan-sheng Wu ◽  
Dong-yan Liu
Keyword(s):  
Red Mud ◽  
Room Temperature ◽  
Structural Transition ◽  
Particle Diameter ◽  
Physical Property ◽  
Mineral Phase ◽  
Sem Images ◽  
Tricalcium Aluminate ◽  
Different Temperatures ◽  
The Mean

Different characterizations were carried out on red mud uncalcined and samples calcined in the range of 100°C–1400°C. In the present paper, the phase composition and structural transition of red mud heated from room temperature are indicated by XRD, TG-DTA, and SEM techniques. The mean particle diameter, density, and bond strength of these samples also have been investigated. The results indicate the decomposition of gibbsite into Al2O3and H2O between 300°C and 550°C and calcite into CaO and CO2in the interval of 600–800°C. Tricalcium aluminate and gehlenite are formed in the range of 800–900°C. Combined with the SEM images, the results of physical property testing show that the particle size and the strength each has a continuous rise during the heat treatment from 150°C to 1350°C. But the value of density will undergo a little drop before 450°C and then increases to a higher value at the temperature of 1200°C. These obtained results provide an important base for the further studies of comprehensive utilization of red mud.

scholarly journals Stability of ferroic phases in the highly piezoelectric Pb(ZrxTi1−x)O3ceramics

2007 ◽  
Vol 64 (1) ◽  
pp. 192-203 ◽  
Author(s):  
Dhananjai Pandey ◽  
Akhilesh Kumar Singh ◽  
Sunggi Baik
Keyword(s):  
Phase Diagram ◽  
Room Temperature ◽  
Physical Property ◽  
Rhombohedral Phase ◽  
Multiple Diffraction ◽  
Pzt Ceramics ◽  
X Ray ◽  
Space Groups ◽  
The Stability ◽  
New Phase

The morphotropic phase boundary in the phase diagram of the technologically important Pb(ZrxTi1−x)O3(PZT) ceramics has been traditionally believed to separate ferroelectric tetragonal and rhombohedral phase regions. This old picture has come under close scrutiny during the last eight years following the discovery of new monoclinic phases in theCmandCcspace groups. This article presents a brief overview of these discoveries in which the use of multiple diffraction probes (X-ray, electron, neutron diffraction) in conjunction with physical property measurements has played a crucial role. A new phase diagram of PZT showing the stability fields of these structures below room temperature is also presented.

Investigation of Ni/Al/Ti Ohmic Contact on N-Type 4H-SiC

2021 ◽  
Vol 1045 ◽  
pp. 186-193
Author(s):  
Meng Qian Xue ◽  
Cai Ping Wan ◽  
Nian Nian Ge ◽  
Heng Yu Xu
Keyword(s):  
Surface Morphology ◽  
Ohmic Contact ◽  
Ohmic Contacts ◽  
Alloy System ◽  
Ohmic Resistance ◽  
Annealing Conditions ◽  
Atomic Force ◽  
Metal Composition ◽  
Specific Contact ◽  
P Type

In order to understand the contribution of various metals in the formation of ohmic contacts, Ni/Al/Ti ohmic contacts on n-type 4H-SiC in terms of a different annealing temperature and Ti composition are investigated, which is more difficult to form than p-type ohmic contact. The formation of the Ni/Al/Ti metal alloy system is much more sensitive to metal composition than annealing conditions. With the increase of metal composition, the contact with a high Ti content yields a lower specific contact resistivity compared with the low Ti contact. The annealed surface morphology and phase resultants were examined by scanning electron microscopy (SEM) and atomic force microscope (AFM), respectively. With the increase of Ti components, the surface morphology of the samples becomes more uniform and smoother, while the surface roughness remains unchanged. It implies that Ti metal can not only reduce the ohmic resistance, but also protect the surface of the sample and maintain the roughness.

Research on Formability of AZ31B Magnesium Alloy at Room Temperature

2014 ◽  
Vol 886 ◽  
pp. 3-6
Author(s):  
Zu Jian Yu ◽  
Jian Hui Li ◽  
Yan Yang
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Strain Ratio ◽  
Alloy Sheet ◽  
Strain Hardening Exponent ◽  
Drawing Ratio ◽  
Plastic Strain Ratio ◽  
Az31b Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Az31b Magnesium Alloy Sheet

Tensile tests and a cold deep drawing process were developed at room temperature to estimate the stamping formability of AZ31B magnesium alloy sheet. The results show that AZ31B magnesium alloy sheet has poor formability at room temperature with the total elongation of ~ 20%, the yield ratio is about 0.6 and the strain-hardening exponent is 0.18, while the plastic strain ratio is 1.58, and the earing ratio is-0.55.Thus, AZ31B magnesium alloy sheet can not suffer server plastic deformation. It was found that comparatively shallow magnesium alloy cups were satisfactorily formed at room temperature without heating when the punch fillet radius 6mm and the die fillet radius10mm with a 1mm thickness sheet with limit drawing ratio of 1.25.

Non-water dyeing process of reactive dyes in two organic solvents with temperature-dependent miscibility

2019 ◽  
Vol 89 (18) ◽  
pp. 3882-3889 ◽  
Author(s):  
Yong Deng ◽  
Man Xu ◽  
Yugao Zhang ◽  
Guofu Zhou ◽  
Nan Li ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Energy Saving ◽  
Organic Solvents ◽  
Room Temperature ◽  
Reactive Dyes ◽  
Physical Property ◽  
Cotton Yarn ◽  
Temperature Dependent ◽  
Dyeing Process ◽  
Unique Physical Property

In this paper, a non-water dyeing process using two organic solvents with temperature-dependent miscibility was developed. Fixation of three conventional reactive dyes on cotton yarn could reach 97% using one dyeing bath consisting of two solvents. Only one washing step at room temperature was needed to get satisfactory fastness after the fixation process. In particular, the two selected organic solvents could interconvert from immiscible to miscible when the temperature interchanged from 30 to 90℃. This unique physical property makes the separation and recycling processes of organic solvents extremely easy and energy saving. A 1 kg yarn package was dyed using this dyeing process: the color deviation (△E) of the inner and outer yarns was less than 1.0 and the tensile strength decreased by 8.5–18.0%. The results show that this dyeing process is extremely promising.

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