Void Formation in Some Nickel-Aluminum Alloys During 20-MeV C

2009 ◽  
pp. 326-326-8
Author(s):  
JA Hudson ◽  
S Francis ◽  
DJ Mazey ◽  
RS Nelson
Keyword(s):  
Aluminum Alloys ◽  
Void Formation ◽  
Nickel Aluminum

scholarly journals The Effect of α-Al(MnCr)Si Dispersoids on Activation Energy and Workability of Al-Mg-Si-Cu Alloys during Hot Deformation

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Xiaoguo Wang ◽  
Jian Qin ◽  
Hiromi Nagaumi ◽  
Ruirui Wu ◽  
Qiushu Li
Keyword(s):  
Activation Energy ◽  
Aluminum Alloys ◽  
Constitutive Equation ◽  
Hot Deformation ◽  
Flow Instability ◽  
Void Formation ◽  
Activation Energies ◽  
Compression Tests ◽  
Softening Mechanism ◽  
Dynamic Softening

The hot deformation behaviors of homogenized direct-chill (DC) casting 6061 aluminum alloys and Mn/Cr-containing aluminum alloys denoted as WQ1 were studied systematically by uniaxial compression tests at various deformation temperatures and strain rates. Hot deformation behavior of WQ1 alloy was remarkably changed compared to that of 6061 alloy with the presence of α-Al(MnCr)Si dispersoids. The hyperbolic-sine constitutive equation was employed to determine the materials constants and activation energies of both studied alloys. The evolution of the activation energies of two alloys was investigated on a revised Sellars’ constitutive equation. The processing maps and activation energy maps of both alloys were also constructed to reveal deformation stable domains and optimize deformation parameters, respectively. Under the influence of α dispersoids, WQ1 alloy presented a higher activation energy, around 40 kJ/mol greater than 6061 alloy’s at the same deformation conditions. Dynamic recrystallization (DRX) is main dynamic softening mechanism in safe processing domain of 6061 alloy, while dynamic recovery (DRV) was main dynamic softening mechanism in WQ1 alloy due to pinning effect of α-Al(MnCr)Si dispersoids. α dispersoids can not only resist DRX but also increase power required for deformation of WQ1 alloy. The microstructure analysis revealed that the flow instability was attributed to the void formation and intermetallic cracking during hot deformation of both alloys.

scholarly journals A MAGNETIC STUDY OF SOME IRON-NICKEL-ALUMINUM ALLOYS

1960 ◽  
Vol 16 (4) ◽  
pp. 214
Author(s):  
WANG HUAN-YUAN ◽  
CHANG SHOU-KUNG ◽  
PAN SHIAO-THUR
Keyword(s):  
Aluminum Alloys ◽  
Magnetic Study ◽  
Nickel Aluminum ◽  
Iron Nickel

scholarly journals The Corrosion Erossion of Ship Propeller Al 7075 Produced by Gravity Sand Casting

2019 ◽  
Vol 2 (2) ◽  
pp. 172-177
Author(s):  
Milka Rante ◽  
Muhammad Syahid ◽  
Onny Sutresman
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Erosion Resistance ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Al 7075 ◽  
Slurry Pot Tester ◽  
Mechanical Properties And Corrosion ◽  
Nickel Aluminum Bronze ◽  
Ship Propeller

Propeller is one of the important components of ships and boats that function as motor or boat propulsion. The mechanical properties required in propeller material are high toughness, easy to cast, and good engine capability, as well as good resistance to corrosion and erosion. One of the aluminum alloys that have been widely used in major vessels in propeller systems is the Nickel-aluminum-bronze (NAB) alloy because it has an excellent combination of mechanical properties and corrosion-erosion resistance. Another type of aluminum alloy that is widely used as a machining component is the Al 7075 T651 because it has the highest strength among other aluminum alloys. The mechanical properties of the Al 7075 T651 are directly proportional to the erosion resistance of the propeller which agrees with the pot tester porridge. The higher the value of the erosion propeller failure that occurs also increases with increasing testing rotational speed. For corrosion, a propeller with air testing media at a speed of 1000 rpm which results in significant corrosion products. Keywords: Al 7075 T651, Slurry Pot Tester, Corrosion Erosion

Electrochemical Behavior of Nickel-Aluminum Alloys in Sodium Chloride Solutions

2010 ◽  
Vol 138 ◽  
pp. 7-20 ◽  
Author(s):  
Konstantin V. Rybalka ◽  
Luiza A. Beketaeva ◽  
Vyacheslav S. Shaldaev ◽  
Nataliya G. Bukhan’ko ◽  
Alexey D. Davydov
Keyword(s):  
Aluminum Alloys ◽  
Intermetallic Compounds ◽  
Alloy Composition ◽  
Potential Range ◽  
Nickel Aluminum ◽  
Anodic Behavior ◽  
Pitting Potential ◽  
Sodium Chloride Solutions ◽  
Potentiodynamic Method ◽  
Wide Potential

The anodic and cathodic reactions involved in the corrosion process on several nickel-aluminum alloys including two intermetallic compounds NiAl and Ni3Al in the NaCl solutions are studied. A procedure of pretreatment of test specimens and measuring the anodic and cathodic voltammograms is developed. It enabled us to obtain reproducible results including Tafel portions of voltammograms. The corrosion potentials Ecorr and corrosion currents icorr are determined by the coordinates of the intersection of anodic and cathodic Tafel plots. The dependences of Ecorr and icorr on the alloy composition (the content of nickel in the binary nickel-aluminum alloys), on the concentration of NaCl, and рН of unbuffered NaCl solutions with the additions of HCl or NaOH are determined. The anodic behavior of the alloys in a wide potential range is studied using the potentiodynamic method and the method of stepwise raising anodic potential with an exposure of electrode at each potential for a certain time. The dependences of pitting potential on the concentration of solution are determined for two intermetallic compounds.

An investigation of the k-effect in Nickel-Aluminum alloys

1965 ◽  
Vol 13 (9) ◽  
pp. 957-964 ◽  
Author(s):  
E.A Starke ◽  
V Gerold ◽  
A.G Guy
Keyword(s):  
Aluminum Alloys ◽  
Nickel Aluminum
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