scholarly journals Characterization of Gallium-induced Intergranular Fracture Surface and the Auger Electron Spectroscopic Analysis for Mg Grain Boundary Segregation in AA6061 T4 Al-Mg-Si Alloy

2004 ◽  
Vol 45 (6) ◽  
pp. 1925-1932 ◽  
Author(s):  
Jun-Yen Uan ◽  
Cheng-Chia Chang
Keyword(s):  
Fracture Surface ◽  
Grain Boundary ◽  
Intergranular Fracture ◽  
Auger Electron ◽  
Spectroscopic Analysis ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Auger Electron Spectroscopic Analysis ◽  
Intergranular Fracture Surface

TEM study of grain boundary phase transformations in Cu-12 at PPM Bi polycrystals

1992 ◽  
Vol 50 (1) ◽  
pp. 210-211
Author(s):  
E.C. Urdaneta ◽  
C. J. McMahon ◽  
D. E. Luzzi
Keyword(s):  
Fracture Surface ◽  
Grain Boundary ◽  
Electron Spectroscopy ◽  
Auger Electron ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Boundary Phase ◽  
Two Component ◽  
Fracture Surface Analysis ◽  
Bi Segregation

Grain boundary segregation-induced faceting is being studied in Cu-12 at ppm Bi polycrystals as a model two-component alloy for grain boundary transformations. It has been demonstrated that Bi segregation is responsible for grain boundary faceting in copper and that this transformation is reversible. Previous Auger electron spectroscopy fracture surface analysis in Bi-doped Cu have shown that grain boundary faceting only occurs after the segregated Bi reaches a saturation concentration of about 1 monolayer.

Grain boundary segregation in metals

1992 ◽  
Vol 50 (2) ◽  
pp. 1204-1205
Author(s):  
C.L. Briant
Keyword(s):  
Fracture Surface ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Material Properties ◽  
Electron Spectroscopy ◽  
High Vacuum ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Local Concentration ◽  
The One

Grain boundary segregation is the process by which solute elements in a material diffuse to the grain boundaries, become trapped there, and increase their local concentration at the boundary over that in the bulk. As a result of this process this local concentration of the segregant at the grain boundary can be many orders of magnitude greater than the bulk concentration of the segregant. The importance of this problem lies in the fact that grain boundary segregation can affect many material properties such as fracture, corrosion, and grain growth.One of the best ways to study grain boundary segregation is with Auger electron spectroscopy. This spectroscopy is an extremely surface sensitive technique. When it is used to study grain boundary segregation the sample must first be fractured intergranularly in the high vacuum spectrometer. This fracture surface is then the one that is analyzed. The development of scanning Auger spectrometers have allowed researchers to first image the fracture surface that is created and then to perform analyses on individual grain boundaries.

Influence of Phosphorus Grain Boundary Segregation on Fracture Behaviour of Iron-Base Alloys

2007 ◽  
Vol 567-568 ◽  
pp. 33-38
Author(s):  
Jozef Janovec ◽  
Jaroslav Pokluda ◽  
Pavel Lejček
Keyword(s):  
Grain Boundary ◽  
Intergranular Fracture ◽  
Stainless Steels ◽  
Structural Changes ◽  
Fracture Behaviour ◽  
Boundary Segregation ◽  
Austenitic Stainless Steels ◽  
Grain Boundary Segregation ◽  
Boundary Concentration ◽  
Factors Influencing

Chemical and structural changes at the grain boundaries were investigated to quantify their influence on fracture behaviour of austenitic stainless steels and model ferritic Fe-Si-P alloys. The balance between the size and the area density of intergranular particles was found to be one of the most decisive factors influencing sensitivity of the steels to intergranular fracture. The precise dependence of the energy of intergranular fracture on the phosphorus grain boundary concentration was also determined.

Grain-Boundary Segregation of Phosphorus and Inter-Granular Fracture Behavior under Low Tensile Stresses

2012 ◽  
Vol 525-526 ◽  
pp. 273-276 ◽  
Author(s):  
Yu Dong Fu ◽  
Qing Fen Li ◽  
Wei Xin Sun
Keyword(s):  
Grain Boundary ◽  
Intergranular Fracture ◽  
Fracture Behavior ◽  
Boundary Segregation ◽  
Grain Boundary Segregation ◽  
Fracture Rate ◽  
Phosphorus Segregation ◽  
Tensile Stresses ◽  
Segregation Behavior ◽  
Segregation Level

The present work is an effort to provide experimental results focusing on segregation behavior of phosphorus at grain boundary and the intergranular fracture behavio under low tensile stresses. AES (Auger electron spectroscopy) experiments and dynamic analyses on the non-equilibrium grain-boundary segregation (NGS) of phosphorus and the SEM photos of intergranular fracture in Auger specimens in 12Cr1MoV steel were carried out in this paper. The variation of phosphorus segregation level in grain boundary under different low tensile stresses and at different temperature were obtained. Results show that NGS of phosphorus occurred in the experimental steel while subjected to low tensile stresses. Maximum values of phosphorus segregation level were obtained at the critical times. SEM photos of intergranular fracture in Auger specimens of the test steel show that the intergranular fracture rate increased with increasing concentration of phosphorus. The intergranular fracture behavior is accordant with the segregation behavior of phosphorus at grain boundary.

Characterization of Grain-Boundary Segregation in MgO

1981 ◽  
Vol 64 (7) ◽  
pp. 385-389 ◽  
Author(s):  
Y. M. CHIANG ◽  
A. F. HENRIKSEN ◽  
W. D. KINGERY ◽  
D. FINELLO
Keyword(s):  
Grain Boundary ◽  
Boundary Segregation ◽  
Grain Boundary Segregation
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