scholarly journals Influence of time of annealing on anneal hardening effect of a cast CuZn alloy

2003 ◽  
Vol 39 (3-4) ◽  
pp. 489-497 ◽  
Author(s):  
Svetlana Nestorovic ◽  
Lj. Ivanic ◽  
Desimir Markovic
Keyword(s):  
Copper Alloy ◽  
Cold Work ◽  
Pure Copper ◽  
Lattice Parameter ◽  
Recrystallization Temperature ◽  
X Ray ◽  
Hardening Effect ◽  
Anneal Hardening ◽  
Cold Rolled ◽  
Cuzn Alloy

Investigated cast copper alloy containing 8at%Zn of a solute. For comparison parallel specimens made from cast pure copper. Copper and copper alloy were subjected to cold rolling with different a final reduction of 30,50 and 70%. The cold rolled copper and copper alloy samples were isochronally and isothermally annealed up to recrystallization temperature. After that the values of hardness, strength and electrical conductivity were measured and X-ray analysis was performed. These investigations show that anneal hardening effect at alloys was attained under recrystallization temperature in the temperature range of 180-3000C, followed with an increase in hardness. The amount of strengthening increase with increasing degree of prior cold work. Also the X-ray analysis show the change of lattice parameter during annealing when anneal hardening effect was attained.

scholarly journals Anneal hardening effect in sintered copper alloys

2002 ◽  
Vol 34 (2) ◽  
pp. 169-174 ◽  
Author(s):  
Svetlana Nestorovic ◽  
Boran Milicevic ◽  
Desimir Markovic
Keyword(s):  
Electrical Conductivity ◽  
Cold Rolling ◽  
Copper Alloys ◽  
Recrystallization Temperature ◽  
Temperature Range ◽  
Hardening Effect ◽  
Sintered Copper ◽  
Anneal Hardening ◽  
Cold Rolled

Samples of copper and copper alloys CuNi and CuNiAl were prepared by a powder metallurgical method and were then subjected to cold rolling with different degrees of deformation. Copper and copper alloys in the cold-rolled state were isochronally annealed up to the recrystallization temperature during which hardness and electrical conductivity were measured. This investigation shows that the anneal hardening effect occurs in a temperature range of 450 - 650 K, followed with an increase in hardness of alloys.

scholarly journals Influence of degree of deformation in rolling on anneal hardening effect of a cast copper alloy

2003 ◽  
Vol 26 (6) ◽  
pp. 601-604 ◽  
Author(s):  
Svetlana Nestorovic ◽  
Desimir Markovic ◽  
Ljubica Ivanic
Keyword(s):  
Copper Alloy ◽  
Degree Of Deformation ◽  
Hardening Effect ◽  
Anneal Hardening

X-ray Measurements of Surface Residual Stresses in Cold Rolled α-Brass

1970 ◽  
Vol 14 ◽  
pp. 389-407 ◽  
Author(s):  
W. Wallace ◽  
T. Terada
Keyword(s):  
Residual Stresses ◽  
Lattice Parameter ◽  
Rolled Sheet ◽  
Near Surface ◽  
X Ray ◽  
Elastic Stresses ◽  
Surface Residual Stresses ◽  
Exposure Method ◽  
Cold Rolled ◽  
Anisotropic Elastic

AbstractResidual elastic stresses have been measured in cold rolled α-brass (30% zinc) using the available x-ray diffractometer methods. Residual stress values obtained by the two exposure and sin2ψ methods of stress analysis are compared with data obtained using Wagner's extrapolation method.For deformations up to 50% reduction in thickness, tensile surface stresses prevailed, and in most cases could be detected by these methods. Uncertainty of the value of a0, the lattice parameter of the deformed' material, presents a serious limitation to the extrapolation technique. Using the approximation a0 = a0ann, residual stresses appear lower than, and frequently of opposite sign to those given by the two exposure method. In addition, lattice parameter variations in the near surface regions of the rolled sheet were opposite to those expected from the true macrostress distributions shown to exist by the two exposure method and by strain gauge techniques. The distributions of ahkl points in the extrapolation plots were in agreement with theory for a combination of anisotropic elastic stresses and low stacking fault density.

Texture and Microstructure of Cold Rolled and Recrystallized Pure Niobium

2007 ◽  
Vol 539-543 ◽  
pp. 3436-3441 ◽  
Author(s):  
H.F.G. Abreu ◽  
Sergio S.M. Tavares ◽  
S.S. Carvalho ◽  
T.H.T. Eduardo ◽  
Antonia Daniele S. Bruno ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Cold Work ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pure Niobium ◽  
Back Scattering ◽  
Cold Rolled

Crystallographic macrotexture of pure niobium cold rolled to 30, 60, 80 and 90% reduction was analyzed by X-ray diffraction and compared with low carbon steel texture. Annealed samples from 800oC, to 1200oC were investigated by X-ray diffraction and electron back scattering diffraction (EBSD). The texture of cold rolled polycrystalline niobium is characterized by a component {001}<110> that increases in intensity with the cold work percentage. After annealing, the component {001}<110> spreads out about 20o.

scholarly journals Influence of deformation degree at cold-rolling on the anneal hardening effect in sintered copper-based alloys

2004 ◽  
Vol 40 (1) ◽  
pp. 101-109 ◽  
Author(s):  
Svetlana Nestorovic
Keyword(s):  
Cold Rolling ◽  
Annealing Temperature ◽  
Pure Copper ◽  
Deformation Degree ◽  
Temperature Range ◽  
Hardening Effect ◽  
Sintered Copper ◽  
Anneal Hardening

Samples of copper-based alloys, Cu-4at%Zn, Cu-8at%Zn and Cu-5at%Ni-2at%Sn and pure copper have been prepared by a powder metallurgical method. The samples were subjected to cold rolling to 30, 50 and 70% in reduction, followed by annealing up to the recrystallization temperatures. Anneal hardening effect has been observed with the alloys in an annealing temperature range of 180-4000C, the hardness being increased with the amount of reduction at the prior cold - rolling.

Shot Peening Characteristics of Cold-Rolled Mo Sheet

2012 ◽  
Vol 724 ◽  
pp. 269-273
Author(s):  
Gue Serb Cho ◽  
Kyeong Hwan Choe ◽  
Won Beom Lee
Keyword(s):  
High Temperature ◽  
Thermal Resistance ◽  
Shot Peening ◽  
Surface Deformation ◽  
Cold Work ◽  
Secondary Recrystallization ◽  
Recrystallization Temperature ◽  
Temperature Range ◽  
Nucleation Sites ◽  
Cold Rolled

The commercial pure Mo sheet was shot peened to increase high-temperature mechanical and thermal resistance. Shot peenining was conducted on the surface of cold-rolled Mo sheet with 0.4MPa of shot pressure. The hardness of bcc Mo sheet was increased with increase of shot peening time. Surface hardenss is gradually increased to 120s at the 0.4MPa pressure, but the profiles become almost flat at the prolonged time. The grains were deformed and work hardened in the surface layer. The surface roughness was also increased with peening time. The grain size of shot-peened Mo sheet was smaller than that of cold-rolled Mo sheet in the all recrystallization temperature range. The reason for this could be a larger density of nucleation sites caused by the higher surface deformation of shot-peened Mo sheet. Mo2C carbide phase was analyzed on the surface of recrystallized Mo sheet at the secondary recrystallization temperature range. It was considered that molybdenum carbide was formed due to the evaporation of graphite heating element in the hot-zone furnace. From this study, shot peening of Mo sheet could be a good cold work hardening method to improve high-temperature mechanical and thermal resistance properties.

COPPER ALLOY No. C72600

Alloy Digest ◽  
1991 ◽  
Vol 40 (8) ◽  
Keyword(s):  
Physical Properties ◽  
Tensile Properties ◽  
Nickel Alloy ◽  
Copper Alloy ◽  
Cold Work ◽  
Heat Treating ◽  
Resistance Welding ◽  
Copper Nickel ◽  
Copper Nickel Alloy

Abstract Copper Alloy No. C72600 is a wrought copper-nickel alloy. It has excellent capacity for cold work and may be readily joined by soldering, brazing, arc and resistance welding. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fatigue. It also includes information on forming, heat treating, and joining. Filing Code: Cu-563. Producer or source: Copper and copper alloy mills.

scholarly journals Growth of sillenite Bi12FeO20 single crystals: structural, thermal, optical, photocatalytic features and first principle calculations

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Durga Sankar Vavilapalli ◽  
Ambrose A. Melvin ◽  
F. Bellarmine ◽  
Ramanjaneyulu Mannam ◽  
Srihari Velaga ◽  
...  
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Photoelectron Spectroscopy ◽  
Diffraction Method ◽  
Lattice Parameter ◽  
First Principle ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Principle Calculations ◽  
Photodegradation Efficiency

AbstractIdeal sillenite type Bi12FeO20 (BFO) micron sized single crystals have been successfully grown via inexpensive hydrothermal method. The refined single crystal X-ray diffraction data reveals cubic Bi12FeO20 structure with single crystal parameters. Occurrence of rare Fe4+ state is identified via X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). The lattice parameter (a) and corresponding molar volume (Vm) of Bi12FeO20 have been measured in the temperature range of 30–700 °C by the X-ray diffraction method. The thermal expansion coefficient (α) 3.93 × 10–5 K−1 was calculated from the measured values of the parameters. Electronic structure and density of states are investigated by first principle calculations. Photoelectrochemical measurements on single crystals with bandgap of 2 eV reveal significant photo response. The photoactivity of as grown crystals were further investigated by degrading organic effluents such as Methylene blue (MB) and Congo red (CR) under natural sunlight. BFO showed photodegradation efficiency about 74.23% and 32.10% for degrading MB and CR respectively. Interesting morphology and microstructure of pointed spearhead like BFO crystals provide a new insight in designing and synthesizing multifunctional single crystals.

scholarly journals Measurements by x-ray diffraction of the temperature dependence of lattice parameter and crystallite size for isostatically-pressed graphite

Carbon Trends ◽  
2021 ◽  
pp. 100071
Author(s):  
Keith R. Hallam ◽  
James Edward Darnbrough ◽  
Charilaos Paraskevoulakos ◽  
Peter J. Heard ◽  
T. James Marrow ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Crystallite Size ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
X Ray

Problems Associated with Kα Doublet in Residual Stress Measurements

1979 ◽  
Vol 23 ◽  
pp. 333-339
Author(s):  
S. K. Gupta ◽  
B. D. Cullity
Keyword(s):  
Residual Stress ◽  
Silicon Powder ◽  
Lattice Parameter ◽  
Diffraction Peak ◽  
Parameter Determination ◽  
X Ray Diffraction ◽  
X Ray ◽  
Analysis Techniques ◽  
The Difference ◽  
Similar Accuracy

Since the measurement of residual stress by X-ray diffraction techniques is dependent on the difference in angle of a diffraction peak maximum when the sample is examined consecutively with its surface at two different angles to the diffracting planes, it is important that these diffraction angles be obtained precisely, preferably with an accuracy of ± 0.01 deg. 2θ. Similar accuracy is desired in precise lattice parameter determination. In such measurements, it is imperative that the diffractometer be well-aligned. It is in the context of diffractometer alignment with the aid of a silicon powder standard free of residual stress that the diffraction peak analysis techniques described here have been developed, preparatory to residual stress determinations.

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