Hierarchical multi-phase microstructural architecture for exceptional strength-ductility combination in a complex concentrated alloy via high-temperature severe plastic deformation

2019 ◽  
Vol 162 ◽  
pp. 38-43 ◽  
Author(s):  
Mageshwari Komarasamy ◽  
Tianhao Wang ◽  
Kaimiao Liu ◽  
Luis Reza-Nieto ◽  
Rajiv S. Mishra
Keyword(s):  
Plastic Deformation ◽  
High Temperature ◽  
Severe Plastic Deformation ◽  
Multi Phase

Role of severe plastic deformation on the cyclic reversibility of a Ti50.3Ni33.7Pd16 high temperature shape memory alloy

2010 ◽  
Vol 58 (19) ◽  
pp. 6411-6420 ◽  
Author(s):  
B. Kockar ◽  
K.C. Atli ◽  
J. Ma ◽  
M. Haouaoui ◽  
I. Karaman ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
High Temperature ◽  
Shape Memory Alloy ◽  
Severe Plastic Deformation ◽  
Shape Memory

Development of Unconventional Processing of Steels in Semi-Solid State

2016 ◽  
Vol 256 ◽  
pp. 251-256
Author(s):  
Bohuslav Mašek ◽  
David Aišman ◽  
Filip Vančura ◽  
Martin F.X. Wagner ◽  
Hana Jirková ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
High Temperature ◽  
Solid State ◽  
Severe Plastic Deformation ◽  
Rapid Solidification ◽  
Process Conditions ◽  
In Situ Observation ◽  
Semi Solid

This paper describes selected capabilities of unconventional processing of steels in semi-solid state under various process conditions and with the use of various steel chemistries for obtaining unusual structures formed by rapid solidification in combination with other procedures. This investigation involves the use of severe plastic deformation techniques (SPD) and in-situ observation of the transformation of microstructure from solid state to semi-solid state at temperatures above 1200°C using a high-temperature microscope.

Processing iron aluminides by heavy deformation for improved room temperature strength-ductility and for high temperature creep strength

2011 ◽  
Vol 1295 ◽  
Author(s):  
David G. Morris ◽  
Maria Antonia Muñoz-Morris
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
High Temperature ◽  
Severe Plastic Deformation ◽  
Creep Strength ◽  
Room Temperature ◽  
High Strain ◽  
Iron Aluminides ◽  
Al Alloy ◽  
Second Phase

ABSTRACTIron aluminides show many interesting properties, but still show relatively poor ductility at room temperature and only moderate creep resistance at temperatures above about 600ºC. Processes of severe plastic deformation have been investigated for a wide range of ductile alloys over the past decade, but have hardly been considered for intermetallics. This presentation discusses two studies aimed at refining microstructure by the use of severe plastic deformation of iron aluminides. The first considers processing Fe3Al by heavy cold rolling, followed by annealing for recovery or recrystallization, with an objective of refining grain size to improve strength at the same time as ductility. The high strength and poor ductility of the work hardened material leads to a danger of cracking during rolling, which is a problem for manufacturing large quantities of healthy material. Suitable rolling and recovery treatments can, nevertheless, lead to strong materials with some plastic ductility. A different technique of multidirectional, high-strain and high-temperature forging applied to a boride-containing Fe3Al alloy produces a material with large grain size and refined dispersion of boride particles. These particles lead to a considerable increase in creep strength under conditions of moderate stresses at temperatures around 700ºC. This high-strain forging technique can be seen as an intermediate processing method between conventional wrought metallurgy and mechanical-alloying powder metallurgy. This technique offers the possibility to improve high temperature behaviour of such intermetallics containing second-phase dispersions, and can be scaled to produce large quantities of high-quality material.

scholarly journals Изменение формы образцов золотомедного сплава в ходе фазового превращения беспорядокпорядок

2020 ◽  
Vol 90 (1) ◽  
pp. 94
Author(s):  
А.В. Глухов ◽  
В.А. Казанцев ◽  
Б.Д. Антонов ◽  
А.Ю. Волков
Keyword(s):  
Plastic Deformation ◽  
High Temperature ◽  
Severe Plastic Deformation ◽  
Copper Alloy ◽  
Shape Change ◽  
Practical Interest ◽  
Atomic Ordering ◽  
Initial State ◽  
Linear Dimensions

A study was made of the changes in the linear dimensions of the ZlM-80 gold-copper alloy samples (with a content of 80 wt.% Gold) during atomic ordering. The initial disordered state in some samples of the alloy was formed by quenching from high temperature, other samples were disordered as a result of severe plastic deformation. It was found that the shape change of samples upon heating strongly depends on their initial state: ordering causes a decrease in the length of hardened wire samples, while the length of the initially deformed samples increases. It is shown that, regardless of the initial state, atomic ordering processes lead to a decrease in the volume of the alloy under study. The results obtained are of both scientific and practical interest.

Analysis of the Fundamental Mechanisms and Efficiency of the Deformation Methods of Nanostructuring

2008 ◽  
Vol 584-586 ◽  
pp. 29-34 ◽  
Author(s):  
Radik R. Mulyukov ◽  
Ayrat A. Nazarov ◽  
Renat M. Imayev
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
High Pressure ◽  
High Temperature ◽  
Severe Plastic Deformation ◽  
Grain Refinement ◽  
Equal Channel Angular Pressing ◽  
Efficient Method ◽  
High Pressure Torsion ◽  
Angular Pressing

Deformation methods of nanostructuring (DMNs) of materials are proposed to classify into severe plastic deformation (SPD) and mild plastic deformation (MPD) methods according to fundamentally different low- and high-temperature grain refinement mechanisms they exploit. A general analysis of the fundamentals and nanostructuring efficiency of three most developed DMNs, high pressure torsion (HPT), equal-channel angular pressing (ECAP), and multiple isothermal forging (MIF) is done with a particular attention to ECAP and MIF. It is demonstrated that MIF is the most efficient method of DMNs allowing one to obtain the bulkiest nanostructured samples with enhanced mechanical properties.

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