scholarly journals High Strength and Ductility in Ball-Milled Titanium Powders Consolidated by High-Pressure Torsion

2010 ◽  
Vol 654-656 ◽  
pp. 1239-1242 ◽  
Author(s):  
Kaveh Edalati ◽  
Z. Horita ◽  
Hiroshi Fujiwara ◽  
Kei Ameyama ◽  
Masaki Tanaka ◽  
...  
Keyword(s):  
High Pressure ◽  
Ball Milling ◽  
High Pressure Torsion ◽  
High Strength ◽  
Ultrafine Grained Structure ◽  
Ultrafine Grained ◽  
Titanium Powders ◽  
Strength And Ductility

Pure Ti powders were subjected to ball milling and subsequently high-pressure torsion (HPT) for consolidation. It is found that a fully dense (99.9%) disc with ultrafine grained structure (~50-300 nm) was produced. The strength and ductility were well comparable to those of ball-milled Ti-6%Al-4%V powders after hot roll sintering.

An Overview on the Fracture Behavior of Metals Processed by High Pressure Torsion

2010 ◽  
Vol 667-669 ◽  
pp. 671-676 ◽  
Author(s):  
Anton Hohenwarter ◽  
Reinhard Pippan
Keyword(s):  
Fracture Toughness ◽  
High Pressure ◽  
Fracture Behavior ◽  
High Pressure Torsion ◽  
High Strength ◽  
High Fracture Toughness ◽  
High Fracture ◽  
Ultrafine Grained ◽  
Specimen Orientation ◽  
Strength And Ductility

Motivated by the large variety of enhanced properties of ultrafine and nanocrystalline materials such materials are under extensive investigation. Besides focusing on classical material parameters, like strength and ductility, the fracture toughness of these materials is also of great importance, especially when the damage tolerance is required. In this contribution an overview of the fracture behavior of different metals covering ultrafine-grained iron and nickel as well as a nanocrystalline steel processed via high pressure torsion (HPT) will be given. It will be shown that the specimen orientation can have a tremendous influence on the fracture behavior and toughness. Due to this toughness anisotropy an unexpectedly good combination of high strength and high fracture toughness can be achieved very often in these materials.

scholarly journals Влияние отжига и дополнительной деформации на механические свойства ультрамелкозернистого сплава Al-1.5Cu

2020 ◽  
Vol 46 (18) ◽  
pp. 30
Author(s):  
А.М. Мавлютов ◽  
Т.С. Орлова ◽  
Э.Х. Яппарова
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
High Pressure Torsion ◽  
High Strength ◽  
High Ductility ◽  
Practical Application ◽  
Short Term ◽  
Ultrafine Grained

The mechanical properties of the ultrafine-grained (UFG) Al–1.5Cu (wt.%) alloy were investigated. The UFG structure was obtained using high pressure torsion (HPT) technique. UFG alloy demonstrates high values of microhardness (1690 MPa), yield strength (515 MPa) and ultimate tensile strength (655 MPa), but low ductility (~3%). Subsequent short-term annealing at 150 °C and additional HPT deformation to 0.25 rotations resulted in some decrease in ultimate tensile strength to 450 MPa, which was ~70% of the value before annealing but provided high ductility (~22%). The results suggests a high potential for practical application of the material. The proposed approach can be an universal effective way to achieve combination of high strength and high ductility for various UFG materials.

Enhanced Ductility in Ultrafine-Grained Al Alloys Produced by SPD Techniques

2009 ◽  
Vol 633-634 ◽  
pp. 321-332 ◽  
Author(s):  
Ruslan Valiev ◽  
Maxim Yu. Murashkin ◽  
Boris B. Straumal
Keyword(s):  
Room Temperature ◽  
High Pressure Torsion ◽  
High Strength ◽  
Al 6061 ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Elongation To Failure ◽  
Processing Regimes ◽  
Zn Alloy ◽  
Strength And Ductility

In this work ultrafine-grained (UFG) structure was successfully produced in the commercial Al 6061 and Al-30%Zn alloys using new modifications of two severe plastic deformation (SPD) techniques, namely equal channel angular pressing (ECAP) with parallel channels (PC) and high pressure torsion (HPT) with enhanced load. Variation of SPD processing regimes made it possible not only to perform strong grain refinement but also to modify the phase composition through the formation of grain boundary (GB) segregations and precipitations. This enabled to achieve a unique combination of high strength and ductility in the Al 6061 alloy and demonstrate super-ductility in the Al-30%Zn alloy, when elongation to failure exceeded 150% at room temperature.

Percolating porosity in ultrafine grained copper processed by High Pressure Torsion

2013 ◽  
Vol 114 (18) ◽  
pp. 183509 ◽  
Author(s):  
Matthias Wegner ◽  
Jörn Leuthold ◽  
Martin Peterlechner ◽  
Daria Setman ◽  
Michael Zehetbauer ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressure Torsion ◽  
Ultrafine Grained
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