Powder Processing of Fe3Al-Based Iron-Aluminide Alloys

1990 ◽  
Vol 213 ◽  
Author(s):  
V.K. Sikka ◽  
R.H. Baldwin ◽  
J.H. Reinshagen ◽  
J.R. Knibloe ◽  
R.N. Wright
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Powder Processing ◽  
Al Alloys ◽  
Iron Aluminide ◽  
Temperature Range

ABSTRACTThe production, characterization, and consolidation of Fe3Al-based iron-aluminide powders are described. The consolidated powders were fabricated into sheet. The sheet was tensile tested from room temperature to 800°C and creep tested in the temperature range of 450 to 704°C. Mechanical properties were compared for nitrogen and argon atomized powders. Mechanical properties were also compared for argon atomized powders of Fe3Al alloys containing 2 and 5% Cr.

scholarly journals Microstructural Characterization and Mechanical Properties of L-PBF Processed 316 L at Cryogenic Temperature

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5856
Author(s):  
Pragya Mishra ◽  
Pia Åkerfeldt ◽  
Farnoosh Forouzan ◽  
Fredrik Svahn ◽  
Yuan Zhong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cryogenic Temperature ◽  
Room Temperature ◽  
Mechanical Performance ◽  
Microstructural Characterization ◽  
Tensile Tests ◽  
Phase Changes ◽  
X Ray Diffraction ◽  
Temperature Range ◽  
Aerospace Applications

Laser powder bed fusion (L-PBF) has attracted great interest in the aerospace and medical sectors because it can produce complex and lightweight parts with high accuracy. Austenitic stainless steel alloy 316 L is widely used in many applications due to its good mechanical properties and high corrosion resistance over a wide temperature range. In this study, L-PBF-processed 316 L was investigated for its suitability in aerospace applications at cryogenic service temperatures and the behavior at cryogenic temperature was compared with room temperature to understand the properties and microstructural changes within this temperature range. Tensile tests were performed at room temperature and at −196 °C to study the mechanical performance and phase changes. The microstructure and fracture surfaces were characterized using scanning electron microscopy, and the phases were analyzed by X-ray diffraction. The results showed a significant increase in the strength of 316 L at −196 °C, while its ductility remained at an acceptable level. The results indicated the formation of ε and α martensite during cryogenic testing, which explained the increase in strength. Nanoindentation revealed different hardness values, indicating the different mechanical properties of austenite (γ), strained austenite, body-centered cubic martensite (α), and hexagonal close-packed martensite (ε) formed during the tensile tests due to mechanical deformation.

Effect of Pre-Aging on the Microstructure and Strength of Supersaturated AlZnMg Alloys Processed by ECAP

2008 ◽  
Vol 584-586 ◽  
pp. 501-506 ◽  
Author(s):  
Nguyen Q. Chinh ◽  
Jenő Gubicza ◽  
Tomasz Czeppe ◽  
Janos Lendvai ◽  
Zoltán Hegedűs ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solution Heat Treatment ◽  
Room Temperature ◽  
Shear Bands ◽  
Natural Aging ◽  
Al Alloys ◽  
Interesting Application ◽  
Subsequent Aging ◽  
Angular Pressing ◽  
Time Periods

This work is focused on the effect of the combination of natural aging and severe plastic deformation (SPD) produced by Equal-Channel Angular Pressing (ECAP) on the microstructure and strength of supersaturated AlZnMg alloys. Following a solution heat-treatment and quenching into water at room temperature, samples were naturally aged for different time periods and then processed by ECAP. The microstructure and mechanical properties of these samples are described and discussed. This investigation leads to proposing an interesting application of ECAP for supersaturated alloys. Using the shear bands created by ECAP in only one pass and applying appropriate subsequent aging treatments, composite-like microstructures can be achieved in conventional age-hardenanble Al alloys.

Preparation, Structure and Mechanical Properties of RuAl and (Ru,Ni)Al Alloys

1996 ◽  
Vol 460 ◽  
Author(s):  
A. L. R. Sabariz ◽  
G. Taylor
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Room Temperature ◽  
Binary Compound ◽  
Lattice Parameter ◽  
Al Alloys ◽  
Solid Solution Hardening ◽  
Solution Hardening ◽  
Cscl Type ◽  
The Difference

ABSTRACTThe intermetallic compound, RuAl with B2 CsCl type structure, has been shown to possess room-temperature toughness and plasticity. NiAl also forms a B2 compound and it is claimed that a pseudo-binary compound, (Ru,Ni)Al, may be formed because the difference in lattice parameter between the two binary phases is slight. In this work a study has been made of the mechanical properties of some polycrystalline compounds, across the RuAl-(Ru,Ni)Al pseudo-binary, prepared from high-purity elemental powders. Compressive yield stresses were measured between room-temperature and 900°C, and the mechanisms of plastic flow are discussed in relation to the dislocation structures observed by TEM. Hot-microhardness tests were made to provide an indication of the effect of solid-solution hardening.

scholarly journals INVESTIGATION OF SUPERPLASTIC BEHAVIOR OF CERTAIN (Zn – Al) ALLOYS

2019 ◽  
Vol 18 (4) ◽  
pp. 604-615
Author(s):  
Sora H Abed ◽  
Abdul Wahid K Rajih ◽  
Ahmed O Al-Roubaiy
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Room Temperature ◽  
Al Alloys ◽  
Al Alloy ◽  
Test Results ◽  
Superplastic Behavior ◽  
Partial Remelting ◽  
Hot Rolled ◽  
Hot Test

Super plasticity behavior finds applications in so many fields, for example the aerospacemanufacturing that is the main bazaar for super plasticity, but automotive, medical, sports,cookware and architectural applications have their share too. "In this work a study of thesuperplastic behavior of a new Zn-Al alloy was conducted. In addition to the investigation ofthe possible superplastic behavior of Zn-0.5Al alloy. These alloys were prepared by usinggravity and chill casting techniques. Zn-0.5Al alloy was subjected to hot rolling at 250 ºCand cold rolling at room temperature, while Zn-48Al alloy was also hot rolled at 250 ºC to20% reduction in the thickness of sample followed by partial remelting at 500 ºC. Severaltests were carried out such as physical, mechanical and chemical which include (XRF, XRD,OP, SEM, Microhardness (HV) and Tensile (cold, hot) test). Results showed that the"Zn-0.5Al alloy has poor mechanical properties and may not be regarded as a superplastic alloycompared with Zn-48Al alloy. The Zn-48Al alloy generally enhanced all properties. Themaximum elongation of (450%) was obtained in Zn-48Al alloy after thermomechanicalcontrolling process and partial remelting.

Processing and Characterization of AA2195 Al-Cu-Li Alloy Bars Processed through Vacuum Induction Melting and Caliber Rolling

2012 ◽  
Vol 710 ◽  
pp. 125-131 ◽  
Author(s):  
Niraj Nayan ◽  
S.V.S. Narayana Murty ◽  
S.C. Sharma ◽  
K. Sreekumar ◽  
Parameshwar Prasad Sinha
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Solution Treatment ◽  
Inert Atmosphere ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Aging Condition ◽  
Temperature Range ◽  
Novel Technique

A novel technique of pure Lithium addition has been adopted for the processing of Al-Cu-Li alloy AA2195 cast ingots (7-8 kg each) in VIM under dynamic inert atmosphere, which gives more than 95% recovery of Lithium. The cast billets were homogenized, forged and converted into 12mm diameter rods by caliber rolling in the temperature range of 250°C, 300°C, 350°C and 400°C. The caliber rolled rods were treated to T8 (Solution Treatment+WQ+CW+Aging) condition. Mechanical properties were evaluated for T8 tempered bars at room temperature and correlated with microstructural observations. Highest mechanical properties in T87 temper have been obtained for rods caliber rolled at 350°C temperature.

scholarly journals Martensite Transformation and Mechanical Properties of Polycrystalline Co-Ni-Al Alloys with Gd Doping

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 848 ◽  
Author(s):  
Jia Ju ◽  
Huan Liu ◽  
Liguo Shuai ◽  
Zhuang Liu ◽  
Yan Kang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Transition ◽  
Compressive Strength ◽  
Transition Temperature ◽  
Phase Transition Temperature ◽  
Martensite Transformation ◽  
Room Temperature ◽  
Al Alloys ◽  
Β Phase

In order to improve the mechanical properties and phase transition temperature, the influence of Gd doping on the microstructure, phase transition temperature and mechanical properties of Co35Ni32Al33 alloy was investigated. The results show that the γ+β phase was observed in the microstructure of the sample with less Gd doping and the γ phase+martensite was found with more Gd content. The phase transition temperature apparently increases with Gd doping and the phase transition temperature goes over room temperature when the Gd is 3 at.% or more. With increasing Gd doping, more γ phase appears in the sample which results in decrease in hardness. The compressive strength decreases from 2274 to 1630 MPa and the ductility increase from 4.2 to 12.9% with increasing Gd content.

Influence of RE on Microstructure and Mechanical Properties of Mg-Li-Al Alloys

2007 ◽  
Vol 546-549 ◽  
pp. 211-216 ◽  
Author(s):  
Bin Liu ◽  
M.L. Zhang ◽  
Zhong Yi Niu
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Melting Furnace ◽  
Optical Microscope ◽  
Al Alloys ◽  
X Ray Diffraction ◽  
Vacuum Melting ◽  
X Ray ◽  
Electronic Microscope ◽  
Cast Microstructure

A series of alloys were designed and prepared using vacuum melting furnace. The as-cast microstructure and phase compositions of these alloys were characterized by optical microscope, X-ray diffraction (XRD) and scanning electronic microscope (SEM). The hardness and mechanical properties of alloys at room temperature were measured as well. The results show that the addition of RE leads to the formation of intermetallic Al3La distributed within grain boundaries. The intermetallic compound with oriented structure impedes grain growth, and refines the grain. The strength and the hardness of the alloys increase with the increase of the RE content in the range of 0.2-0.8 wt %.

Effect of high temperatures on mechanical properties of seam metal of low-carbon low-alloy steel welded joint

2021 ◽  
pp. 33-38
Author(s):  
S. A. Nikulin ◽  
◽  
S. O Rogachev ◽  
V. A. Belov ◽  
V. Yu. Turilina ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Comparative Analysis ◽  
Alloy Steel ◽  
Room Temperature ◽  
Weld Seam ◽  
Welded Joint ◽  
Low Carbon ◽  
Low Alloy Steel ◽  
Plastic Properties ◽  
Temperature Range

The mechanical properties of the seam metal of a low-carbon low-alloy steel welded joint of the 22K type (Russian standard) have been investigated when testing for uniaxial tension in the temperature range from room temperature to 1200 °C. A comparative analysis of the changes in the structure, the strength and plastic properties of base metal and weld seam metal in the selected temperature range was carried out.

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