Influence of grain size and geothermal gradient on the ductile-to-brittle transition in arenaceous sedimentary rocks: implications for fault structure and fluid flow

2007 ◽  
Vol 289 (1) ◽  
pp. 105-121 ◽  
Author(s):  
Q. J. Fisher ◽  
S. D. Harris ◽  
M. Casey ◽  
R. J. Knipe
Keyword(s):  
Grain Size ◽  
Fluid Flow ◽  
Sedimentary Rocks ◽  
Geothermal Gradient ◽  
Fault Structure ◽  
Brittle Transition ◽  
Ductile To Brittle Transition

Is There a Critical Size in Nano Grained Metals for Ductile to Brittle Transition?

2004 ◽  
Author(s):  
Aman Haque ◽  
Taher Saif
Keyword(s):  
Grain Size ◽  
Grain Boundary ◽  
Critical Size ◽  
Volume Ratio ◽  
Metal Films ◽  
Metal Structures ◽  
Brittle Transition ◽  
Ductile To Brittle Transition ◽  
Metal Properties

Nanoscale metal films and electrodes are extensively used in today’s micro and nano electronics as well as nano mechanical systems. These metal structures are usually polycrystalline in nature with nano scale grains connected to each other by grain boundaries. The small size offers large grain boundary to volume ratio that is likely to affect the metal properties significantly. Here, we discuss the role of grain size and boundaries in determining the mechanical behavior of metals, such as elasticity and yielding.

The Effect of Intermetallic Phases on Ductile to Brittle Transition of Aluminium-Iron Alloy

2014 ◽  
Vol 592-594 ◽  
pp. 770-775
Author(s):  
Shahrukh Shamim ◽  
Gaurav Sharma ◽  
Chandrabalan Sasikumar
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Transition Temperature ◽  
Research Work ◽  
Iron Alloy ◽  
Energy Transition ◽  
Intermetallic Phases ◽  
Impact Testing ◽  
Brittle Transition ◽  
Ductile To Brittle Transition

The effect of intermetallic phases and grain size on ductile to brittle transition temperature of Aluminium-Iron alloy (Al–11% Fe) was investigated in this research work. An Izod impact testing method was adopted to study the DBTT in the temperature interval of 77 K to 373 K. The ductile-brittle transition points: fracture transition plastic (FTP), fracture-appearance transition temperature (FATT), impact energy transition temperature (IETT), fractional surface area of cleavage (brittle) and fibrous (ductile) fractures and grain size of the samples were also determined. The fracture toughness of Al-Fe alloy found decreasing with temperature in contrast to conventional materials. The fractographic investigation revealed that the microstructural changes play a major role in determining the fracture toughness of these alloys. Annealing of these samples slightly improved the fracture toughness as the spherical morphology of intermetallic particles resists the crack propagation.

Controls on fracture distribution in Cretaceous sedimentary rocks from the Isfahan region, Iran

2017 ◽  
Vol 156 (06) ◽  
pp. 1092-1104 ◽  
Author(s):  
ALI FARZIPOUR SAEIN ◽  
ZAHRA TAJMIR RIAHI
Keyword(s):  
Grain Size ◽  
Fluid Flow ◽  
Sedimentary Rock ◽  
Sedimentary Rocks ◽  
Sedimentary Basins ◽  
Fracture Pattern ◽  
Fracture Spacing ◽  
Diagenetic Processes ◽  
Fracture Patterns ◽  
Fracture Distribution

AbstractIn this study, relationships between fracture patterns, lithology, thickness, diagenetic processes and grain size are evaluated within Cretaceous sediments in two sections of Dizlu and Kolah Ghazi of Isfahan. This study area was selected based on its outcrops of different rock units and its well-developed tectonic fractures. The fracture patterns within stratigraphic units of these sections are studied using geometrical and statistical analyses. This study finds that variable fracture spacing and fracture spacing ratios can be affected by lithology, thickness, grain size of sediments and diagenetic processes. A study of fracture stratigraphy based on fracture pattern evaluation within different cropped-out sedimentary rocks can be used to improve understanding of the same types of sedimentary rock units below the surface or throughout other sedimentary basins. Consequently, this could improve information regarding storage and fluid flow pattern throughout sedimentary rocks in different regions, even for subsurface purposes.

The Effects of Grain Size on the Flow and Fracture of Long-Range Ordered Alloys

1984 ◽  
Vol 39 ◽  
Author(s):  
Erland M. Schulson
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Grain Refinement ◽  
Low Temperatures ◽  
Ferritic Steels ◽  
Brittle Transition ◽  
Ordered Alloys ◽  
Brittle Transition Temperature ◽  
Ductile To Brittle Transition ◽  
Grain Refinement Strengthening

Three points usually come to mind when considering the effects of grain size on the mechanical properties of polycrystals: strengthening at low temperatures through grain refinement, strengthening at high temperatures through grain coarsening, and lowering of the ductile to brittle transition temperature in materials such as ferritic steels and zinc through grain refinement. Ordered alloys, as we shall see, exhibit the same effects.

Sign in / Sign up

Export Citation Format

Share Document