Quantitative effects of strain, temperature, number of cycles and grain size on fraction of special boundaries generated in commercially pure nickel

2012 ◽  
Vol 51 (2) ◽  
pp. 195-201 ◽  
Author(s):  
Q Y Li ◽  
N L Richards
Keyword(s):  
Grain Size ◽  
Pure Nickel ◽  
Special Boundaries ◽  
Commercially Pure ◽  
Number Of Cycles

scholarly journals The Effects of Strain Annealing on Grain Boundary Distribution and Hardening in Superpure Nickel

1996 ◽  
Vol 28 (1-2) ◽  
pp. 71-79 ◽  
Author(s):  
C. B. Thomson ◽  
V. Randle
Keyword(s):  
Grain Boundary ◽  
Electron Backscatter Diffraction ◽  
Pure Nickel ◽  
Special Boundary ◽  
Special Boundaries ◽  
Commercially Pure ◽  
Electron Backscatter ◽  
Twin Formation ◽  
High Level ◽  
Backscatter Diffraction

Electron backscatter diffraction is applied to the study of texture and mesotexture in superpure nickel. Low level strain annealing is shown to influence the grain boundary population such that greater proportions of special boundaries exist. It is found that variations in the texture of a specimen are not reflected by characteristic changes in the grain boundary population, indicating that texture analysis cannot be applied to the prediction of special boundary densities. Mechanisms active during the evolution of special boundaries are discussed and compared to those involved under similar conditions in commercially pure nickel. It is shown that alnnealing twin formation need not be prevalent for a high level of special boundaries to form. Differences in the hardness of various boundary types are identified, such that low angle boundaries and ∑3 boundaries close to exact misorientation can be categorized separately to other boundaries, in that they show minimal hardening.

519 Effect of Grain Size and Specimen Size on Fatigue Damage in Commercially Pure Iron Thin Wires

2010 ◽  
Vol 2010.85 (0) ◽  
pp. _5-19_
Author(s):  
Naruo MIYABE ◽  
Taro NAKAMURA ◽  
Hiroshi TANAKA ◽  
Yoshikazu NAKAI ◽  
Kenta AKO
Keyword(s):  
Grain Size ◽  
Fatigue Damage ◽  
Pure Iron ◽  
Specimen Size ◽  
Thin Wires ◽  
Commercially Pure

The Effect of 'Hydrogenation – Recalcination' Cycling on the Magnetic Properties of Strontium Hexaferrite

2007 ◽  
Vol 280-283 ◽  
pp. 465-466 ◽  
Author(s):  
S.A. Seyyed Ebrahimi
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Marked Effect ◽  
Hydrogen Atmosphere ◽  
Significant Enhancement ◽  
Strontium Hexaferrite ◽  
Initial Sample ◽  
Maximum Value ◽  
The Reformation ◽  
Number Of Cycles

Strontium hexaferrite powder synthesized conventionally was treated in a hydrogen atmosphere and then recalcined in air. This process had a marked effect on the microstructure and on the magnetic properties of the initial sample. The process was repeated several times and the effects investigated. The results showed that the products of the treatment prior to recalcination are Fe and Sr7Fe10O22 and this resulted in a change in magnetic properties from hard to soft. Consequent calcination, resulted in the reformation of strontium hexaferrite but now with a much finer grain size. This resulted in a significant enhancement of the coercivity. The variation of the coercivity with the number of cycles indicated a maximum value of 413 kA/m which then remained constant with subsequent cycling.

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