The Role of Stacking Fault Energy and Deformation Twinning on the Indentation Size Effect of FCC Pure Metals and Alloys

2012 ◽  
pp. 739-746
Author(s):  
David Stegall ◽  
A.A. Elmustafa
Keyword(s):  
Size Effect ◽  
Indentation Size Effect ◽  
Deformation Twinning ◽  
Stacking Fault ◽  
Metals And Alloys ◽  
Stacking Fault Energy ◽  
Indentation Size ◽  
Pure Metals

The Role of Stacking Fault Energy on the Indentation Size Effect of FCC Pure Metals and Alloys

2012 ◽  
Vol 1424 ◽  
Author(s):  
D.E. Stegall ◽  
M.A. Mamun ◽  
A.A. Elmustafa
Keyword(s):  
Size Effect ◽  
Indentation Size Effect ◽  
Stacking Fault ◽  
Cross Slip ◽  
Indentation Size ◽  
Fcc Metals ◽  
Partial Dislocations ◽  
Dislocation Movement ◽  
Pure Metals ◽  
Interfacial Characteristic

ABSTRACTWe investigated the effect of stacking fault free energy (SFE), on the magnitude of the indentation size effect (ISE) of several pure FCC metals using nanoindentation. The metals chosen were 99.999% Aluminum, 99.95% Nickel, 99.95% Silver, and 70/30 Copper Zinc (α-brass). Aluminum has a high SFE of about 200 mJ/ m2, whereas α -brass has a low SFE of less than 10 mJ/ m2. Nickel and Silver have intermediate SFE of about 128 mJ/ m2 and 22 mJ/m2 respectively. The SFE is an important interfacial characteristic and plays a significant role in the deformation of FCC metals due to its influence on dislocation movement and morphology. The SFE is a measure of the distance between partial dislocations and has a direct impact on the ability of dislocations to cross slip during plastic deformation. The lower the SFE the larger the separation between partial dislocations and thus cross slip and dynamic recovery are inhibited. The SFE impacts pure metals differently from alloys. It was discovered that the characteristic ISE behavior for the pure metals was different when compared to the α-brass which is an alloy. Several additional alloys were chosen for comparison including 7075 Aluminum and 70/30 Nickel Copper.

The frictional component of the indentation size effect in low load microhardness testing

1993 ◽  
Vol 8 (5) ◽  
pp. 1028-1032 ◽  
Author(s):  
H. Li ◽  
A. Ghosh ◽  
Y.H. Han ◽  
R.C. Bradt
Keyword(s):  
Size Effect ◽  
Test Specimen ◽  
Indentation Size Effect ◽  
Volume Ratio ◽  
Indentation Size ◽  
Proportional Specimen Resistance ◽  
Low Load ◽  
Microhardness Testing ◽  
Hardness Increase

The role of friction between the microhardness indenter and the test specimen is addressed through the analysis of dry (unlubricated) and lubricated tests on iron by Atkinson and Shi. Quantitative evaluation through a proportional specimen resistance model accurately describes the results. It suggests that friction is a major portion of the observed hardness increase at low test loads, the indentation size effect. The ISE is related to the surface-area-to-volume ratio of the indentation, which is inversely related to the indentation dimension.

scholarly journals Investigation of the mechanism of the indentation size effect for titanium

2019 ◽  
Vol 6 (2) ◽  
pp. 18-00545-18-00545
Author(s):  
Shota HASUNUMA ◽  
Hirohisa MIYAZAKI ◽  
Takeshi OGAWA
Keyword(s):  
Size Effect ◽  
Indentation Size Effect ◽  
Indentation Size

Indentation size effect of cortical bones submitted to different soft tissue removals

2013 ◽  
Vol 20 ◽  
pp. 338-346 ◽  
Author(s):  
A. Bandini ◽  
D. Chicot ◽  
P. Berry ◽  
X. Decoopman ◽  
A. Pertuz ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Size Effect ◽  
Indentation Size Effect ◽  
Indentation Size
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