Fabrication of high strength in-situ Al-Al3Ti nanocomposite by mechanical alloying and hot extrusion: Investigation of fracture toughness

2016 ◽  
Vol 658 ◽  
pp. 246-254 ◽  
Author(s):  
E. Basiri Tochaee ◽  
H.R. Madaah Hosseini ◽  
S.M. Seyed Reihani
Keyword(s):  
Fracture Toughness ◽  
Mechanical Alloying ◽  
Hot Extrusion ◽  
High Strength

Bimodal-grained high-strength nickel-base ODS alloy fabricated by mechanical alloying and hot extrusion

2021 ◽  
Vol 26 ◽  
pp. 101921
Author(s):  
Wuqiang He ◽  
Feng Liu ◽  
Liming Tan ◽  
Lan Huang ◽  
Yan Nie ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
Hot Extrusion ◽  
High Strength ◽  
Nickel Base ◽  
Ods Alloy

Synthesis and Properties of In-Situ MoSi2/SiC Composites

1993 ◽  
Vol 322 ◽  
Author(s):  
S. Jayashankar ◽  
S.E. Riddle ◽  
M. J. Kaufman
Keyword(s):  
Fracture Toughness ◽  
Mechanical Alloying ◽  
Room Temperature ◽  
Indentation Fracture ◽  
Processing Scheme ◽  
Indentation Fracture Toughness ◽  
Novel Processing ◽  
Sic Composites

AbstractCompositionally-tailored, silica-free, MoSi2/SiC composites with SiC content ranging from 0 to 40 percent were synthesized through a novel processing scheme involving mechanical alloying and in-situ reactions for the formation of the reinforcement. Room temperature indentation fracture toughness and hardness measurements were obtained from these silica-free composites and were compared with values obtained from silica-containing, conventionally-processed MoSi2/SiC composites.

Fabrication of Aluminum/Aluminum Nitride Composites by Reactive Mechanical Alloying

2007 ◽  
Vol 534-536 ◽  
pp. 181-184
Author(s):  
Seung Hoon Yu ◽  
Kwang Seon Shin
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Elevated Temperatures ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Processing Technique ◽  
Compression Tests ◽  
Composite Powders ◽  
Al Matrix Composites

Various reactions and the in-situ formation of new phases can occur during the mechanical alloying process. In the present study, Al powders were strengthened by AlN, using the in-situ processing technique during mechanical alloying. Differential thermal analysis and X-ray diffraction studies were carried out in order to examine the formation behavior of AlN. It was found that the precursors of AlN were formed in the Al powders and transformed to AlN at temperatures above 600oC. The hot extrusion process was utilized to consolidate the composite powders. The composite powders were canned in an Al can and then extruded at elevated temperatures. The microstructure of the extrusions was examined by SEM and TEM. In order to investigate the mechanical properties of the extrusions, compression tests and hardness measurements were carried out. It was found that the mechanical properties and the thermal stability of the Al/AlN composites were significantly greater than those of conventional Al matrix composites.

IncoMAP Alloy Al-9052

Alloy Digest ◽  
1989 ◽  
Vol 38 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Mechanical Alloying ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Corrosion Resistant

Abstract IncoMAP alloy Al-9052 is a high-strength, corrosion resistant aluminum alloy made by the mechanical alloying process. It is dispersion strengthened by oxides and carbides. Its density is 5% less than age hardenable aluminum alloys of comparable strength. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Al-296. Producer or source: Inco Alloys International Inc..

Super High Strength Aluminum Alloy Processed by Mechanical Alloying and Hot Extrusion

2012 ◽  
pp. 1643-1648
Author(s):  
Ruixiao Zheng ◽  
Han Yang ◽  
Zengjie Wang ◽  
Shizhen Wen ◽  
Tong Liu ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Mechanical Alloying ◽  
Hot Extrusion ◽  
High Strength ◽  
High Strength Aluminum Alloy

Plasticity Mechanisms in Multi-Scale Copper-Based Nanocomposite Wires

2007 ◽  
Vol 539-543 ◽  
pp. 814-819 ◽  
Author(s):  
Ludovic Thilly ◽  
Vanessa Vidal ◽  
Florence Lecouturier
Keyword(s):  
Plastic Deformation ◽  
Size Effects ◽  
Hot Extrusion ◽  
High Strength ◽  
Cold Drawing ◽  
High Yield ◽  
Multi Scale ◽  
Pulsed Magnets ◽  
In Situ Deformation

Copper-based high strength nanofilamentary wires reinforced by Nb nanofilaments are prepared by severe plastic deformation (repeated hot extrusion, cold drawing and bundling steps) for the winding of high pulsed magnets. The effects of microstructure refinement on the plasticity mechanisms were studied via nanoindentation, in-situ deformation in TEM and under neutron beam: all results evidence size effects in each nanostructured phase of the nanocomposite wires, i.e. single dislocation regime in the finest regions of the Cu matrix and whisker-like behaviour in the Nb nanofilaments. The macroscopic high yield stress is thus the results of the combination of the different elastic-plastic regimes of each phase that include size effects.

Ultrahigh-Temperature Nb-Silicide-Based Composites

MRS Bulletin ◽  
2003 ◽  
Vol 28 (9) ◽  
pp. 646-653 ◽  
Author(s):  
B. P. Bewlay ◽  
M. R. Jackson ◽  
J.-C. Zhao ◽  
P. R. Subramanian ◽  
M. G. Mendiratta ◽  
...  
Keyword(s):  
Hot Extrusion ◽  
High Strength ◽  
Turbine Engines ◽  
Crack Growth Behavior ◽  
Potential Applications ◽  
Ultrahigh Temperature ◽  
And Performance ◽  
Induction Skull Melting ◽  
Powder Metallurgy Methods

AbstractThis article reviews the most recent progress in the development of Nb-silicide-based in situ composites for potential applications in turbine engines with service temperatures of up to 1350°C. These composites contain high-strength Nb silicides that are toughened by a ductile Nb solid solution. Preliminary composites were derived from binary Nb-Si alloys, while more recent systems are complex and are alloyed with Ti, Hf, W, B, Ge, Cr, and Al. Alloying schemes have been developed to achieve an excellent balance of room-temperature toughness, fatigue-crack-growth behavior, high-temperature creep performance, and oxidation resistance over a broad range of temperatures. Nb-silicide-based composites are described with emphasis on processing, microstructure, and performance. Nb silicide composites have been produced using a range of processing routes, including induction skull melting, investment casting, hot extrusion, and powder metallurgy methods. Nb silicide composite properties are also compared with those of Ni-based superalloys.

scholarly journals Investigation of Hydrogen Embrittlement Susceptibility and Fracture Toughness Drop after in situ Hydrogen Cathodic Charging for an X65 Pipeline Steel

Micromachines ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 430 ◽  
Author(s):  
Helen Kyriakopoulou ◽  
Panagiotis Karmiris-Obratański ◽  
Athanasios Tazedakis ◽  
Nikoalos Daniolos ◽  
Efthymios Dourdounis ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Volume Fraction ◽  
Pipeline Steel ◽  
High Strength ◽  
Electrolytic Cell ◽  
Low Alloy Steels ◽  
Crack Tip Opening Displacement ◽  
Opening Displacement ◽  
Alloy Steels

The present research focuses on the investigation of an in situ hydrogen charging effect during Crack Tip Opening Displacement testing (CTOD) on the fracture toughness properties of X65 pipeline steel. This grade of steel belongs to the broader category of High Strength Low Alloy Steels (HSLA), and its microstructure consists of equiaxed ferritic and bainitic grains with a low volume fraction of degenerated pearlite islands. The studied X65 steel specimens were extracted from pipes with 19.15 mm wall thickness. The fracture toughness parameters were determined after imposing the fatigue pre-cracked specimens on air, on a specific electrolytic cell under a slow strain rate bending loading (according to ASTM G147-98, BS7448, and ISO12135 standards). Concerning the results of this study, in the first phase the hydrogen cations’ penetration depth, the diffusion coefficient of molecular and atomic hydrogen, and the surficial density of blisters were determined. Next, the characteristic parameters related to fracture toughness (such as J, KQ, CTODel, CTODpl) were calculated by the aid of the Force-Crack Mouth Open Displacement curves and the relevant analytical equations.

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