The Characterization of Soft Fine‐Grained Heat‐Affected Zones in P91 Weldments under Creep Exposure Conditions

2019 ◽  
Vol 91 (1) ◽  
pp. 1900342 ◽  
Author(s):  
Chandan Pandey
Keyword(s):  
Fine Grained ◽  
Creep Exposure ◽  
Exposure Conditions

Characterization of ultra-fine grained aluminum produced by accumulative back extrusion (ABE)

2012 ◽  
Vol 68 ◽  
pp. 14-21 ◽  
Author(s):  
H. Alihosseini ◽  
G. Faraji ◽  
A.F. Dizaji ◽  
K. Dehghani
Keyword(s):  
Fine Grained

Fine-grained weathering products in waste disposal from two sulphide mines in the northern Apennines, Italy

Clay Minerals ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 423-433 ◽  
Author(s):  
E. Dinelli ◽  
N. Morandi ◽  
F. Tateo
Keyword(s):  
Acidic Solution ◽  
Chemical Characterization ◽  
Northern Apennines ◽  
The Other ◽  
Blue Colour ◽  
Fine Grained ◽  
Surrounding Environment ◽  
Waste Rock Piles ◽  
Cu And Zn

AbstractFrom mineralogical and chemical characterization of two waste-rock piles from Vigonzano and Libiola sulphide mines in the northern Apennines, two types of fine-grained weathering products were recognized, One, from the Vigonzano mine, has a typical blue colour and consists of the Cu-Al sulphate of the woodwardite group. Its formation is related to an alkaline geochemical barrier, it is rather stable in acidic solution, and it controls Cu and Zn dispersion in the surrounding environment. The other group of sediments has a typical ochreous colour. Vigonzano samples consist mostly of goethite, whereas ferrihydrite is abundant in the Libiola sample. The ochreous sediments are enriched in Co, As, Mo, Se and Mn, thus significantly reducing the potential environmental hazard of the site, whereas solubility tests indicated possible problems due to AI dissolution at Libiola.

scholarly journals Characterization of glacial silt and clay using automated mineralogy

2019 ◽  
Vol 60 (80) ◽  
pp. 49-65
Author(s):  
Jeff W. Crompton ◽  
Gwenn E. Flowers ◽  
Brendan Dyck
Keyword(s):  
Grain Size ◽  
Size Composition ◽  
Rock Properties ◽  
Fine Grained ◽  
Rock Fragments ◽  
Grain Sizes ◽  
Automated Mineralogy ◽  
Log Normal ◽  
Discrete Populations

AbstractGlacial erosion produces vast quantities of fine-grained sediment that has a far-reaching impact on Earth surface processes. To gain a better understanding of the production of glacial silt and clay, we use automated mineralogy to quantify the microstructure and mineralogy of rock and sediment samples from 20 basins in the St. Elias Mountains, Yukon, Canada. Sediments were collected from proglacial streams, while rock samples were collected from ice marginal outcrops and fragmented using electrical pulse disaggregation. For both rock fragments and sediments, we observe a log-normal distribution of grain sizes and a sub-micrometer terminal grain size. We find that the abrasion of silt and clay results in both rounding and the exploitation of through-going fractures. The abundance of inter- versus intragranular fractures depends on mineralogy and size. Unlike the relatively larger grains, where crushing and abrasion are thought to exploit and produce discrete populations of grain sizes, the comminution of fines leads to a grain size, composition and rounding that is continuously distributed across size, and highly dependent on source-rock properties.

Sign in / Sign up

Export Citation Format

Share Document