Effect of alloying elements on thermal stability of nanocrystalline Al alloys

Abstract The effect of alloying elements on thermal stability of five different near eutectic Al-Ce based alloys, i.e., Al-12Ce, Al-12Ce-4Si, Al-12Ce-0.4Mg, Al-12Ce-4Si-0.4Mg and Al-12Ce-4Si-0.4Mg-0.25Sr alloys were investigated. The alloys were heat treated at three different temperatures, i.e., 200 °C, 300 °C and 400 °C to establish the thermal stability. Binary Al-12Ce alloy consisting of α-Al and showed higher resistance to coarsening at all temperatures. Addition of Si decreases the thermal stability above 200 °C while combined addition of Si and Mg increases the thermal stability up to 300 °C. Addition of Sr to quaternary alloy was not beneficial to enhance the thermal stability.

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Mossbauer Study of the Role of Aluminum and Chromium in Nitrogen Implanted Iron

MRS Proceedings ◽

10.1557/proc-235-509 ◽

1991 ◽

Vol 235 ◽

Cited By ~ 2

Author(s):

M. Kopcewicz ◽

J. Jagielski ◽

A. Turos ◽

D. L. Williamson

Keyword(s):

Thermal Stability ◽

Ion Implantation ◽

Metallic Iron ◽

Conversion Electron ◽

Alloying Elements ◽

Mössbauer Study ◽

Conversion Electron Mössbauer Spectroscopy ◽

Conversion Electron Mossbauer Spectroscopy ◽

Thermal Stability Of

ABSTRACTThe role of alloying elements such as Cr and Al in the formation and stability of the nitride phases formed due to N ion implantation into metallic iron was studied by conversion electron Mössbauer spectroscopy (CEMS). The thermal stability of nitride phases upon 1 h annealing was greatly increased as a result of co-implanting either Cr or Al with N as compared to pure α-Fe implanted only with N.

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Some aspects for increasing of heat-temperature strength of casting complex alloyed nickel-based alloys due to effect of redistribution of alloying elements between γ-solid solution and hardening γ′-phase

Blanking productions in mechanical engineering (press forging, foundry and other productions) ◽

10.36652/1684-1107-2021-19-9-412-418 ◽

2021 ◽

pp. 412-418

Author(s):

V.N. Gadalov ◽

A.V. Filonovich ◽

I.V. Vornacheva ◽

E.A. Filatov ◽

I.A. Makarova

Keyword(s):

Thermal Stability ◽

Nickel Alloys ◽

Diffusion Processes ◽

Distribution Coefficients ◽

Alloying Elements ◽

Basic Principles ◽

Heat Temperature ◽

Positive Effect ◽

Thermal Stability Of ◽

Alloyed Nickel

The positive effect of alloying elements on the thermal stability of the γ-matrix and the strengthening γ'-phase of casting nickel alloys, and consequently, on the increase in their heat-temperature strength is established. The alloying elements inhibit diffusion processes, thereby increasing the creep resistance of alloys at high temperatures and loads. It is found that the most indicative parameters of the phase composition of the test alloys are the alloying elements distribution coefficients between the γ- and γ'-phases. The basic principles of balanced alloying are formulated, on which the choice of the optimal chemical composition of heat-temperature nickel alloys is carried out.

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Synthesis of Fe-rich Fe–Al nanocrystalline solid solutions using ball milling

Journal of Materials Research ◽

10.1557/jmr.1999.0238 ◽

1999 ◽

Vol 14 (5) ◽

pp. 1760-1770 ◽

Cited By ~ 18

Author(s):

H. G. Jiang ◽

H. M. Hu ◽

E. J. Lavernia

Keyword(s):

Heat Treatment ◽

Activation Energy ◽

Thermal Stability ◽

Intermetallic Compound ◽

Ball Milling ◽

Microstructural Evolution ◽

Solid Solutions ◽

Al Alloys ◽

Time Intervals ◽

Thermal Stability Of

The synthesis of nanocrystalline Fe, Fe–4 wt% Al, and Fe–10 wt% Al solid solutions by SPEX ball milling has been studied. The microstructural evolution during ball milling, as well as subsequent heat treatment, has been characterized. The results demonstrate that ball milling promotes the formation of αFe–4 wt% Al and αFe–10 wt% Al solid solutions by reducing the activation energy of these alloys and generating thermal energy during this process. For Fe–10 wt% Al powders milled for various time intervals up to approximately 20 min, the FeAl intermetallic compound is formed. For alloys annealed at temperatures ranging from 600 to 1000 °C, the addition of 10 wt% Al to Fe significantly enhances the thermal stability of the nanocrystalline Fe–Al alloys. Interestingly, the addition of Al within the range of 4–10 wt% seems to have little effect on the thermal stability of these alloys annealed under the same conditions. Also, the thermal stability improves for alloys milled in air as opposed to those processed using Ar.

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The Effect of Erbium on the Properties and Microstructure of Al Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.706-709.329 ◽

2012 ◽

Vol 706-709 ◽

pp. 329-334 ◽

Cited By ~ 6

Author(s):

Zuo Ren Nie ◽

Hui Huang ◽

Kun Yuan Gao ◽

Bo Long Li ◽

Wei Wang ◽

...

Keyword(s):

Thermal Stability ◽

Tensile Strength ◽

Corrosion Resistance ◽

Pure Aluminum ◽

Fatigue Property ◽

Al Alloys ◽

Small Addition ◽

Excellent Corrosion Resistance ◽

Thermal Stability Of ◽

Strength And Ductility

Mechanical properties, corrosion resistance, and microstructure of Al alloys with trace element erbium were studied. Systemic studies in the pure aluminum and 5xxx series Al alloys showed that the tensile strength was significantly improved by above 20% with little loss of elongation by Er alloying. The 5xxx series Al alloys with erbium also exhibited excellent corrosion resistance. Erbium improved the aging hardness response of 7xxx series Al alloys and the addition of 0.4%Er to Al-Zn-Mg alloys increases the hardness by 35MPa. In all experiment Al alloys, a small addition of 0.1wt% Er induced a quick increase of the tensile strength and the amount of 0.4%Er shows optimized balance of the strength and ductility. The Er addition improved the thermal stability, with increasing the starting Rex temperature about 50°C in all investigated Al alloys. With regard to the microstructure mechanisms, in all experimental Al alloys Er addition has significantly refined the microstructure, which mainly attributed to presence the Al3Er particles. In the 7xxx series Al alloys, no observable PFZ after addition of 0.4% Er was found. The fatigue property, the fracture toughness and the thermal stability of microstructure and properties are on the way.

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Thermal Stability of Rapidly Quenched TI-NI-AL Amorphous Alloys

MRS Proceedings ◽

10.1557/proc-58-59 ◽

1985 ◽

Vol 58 ◽

Cited By ~ 3

Author(s):

K. Aoki ◽

K. Hiraga ◽

T. Masumoto

Keyword(s):

Thermal Stability ◽

Amorphous Phase ◽

Amorphous Alloys ◽

Melt Spinning ◽

Composition Range ◽

Amorphous Matrix ◽

Al Alloys ◽

The Other ◽

Molten State ◽

Thermal Stability Of

ABSTRACTTi-Ni-Al alloys were rapidly quenched from a molten state by the melt spinning method. Three kinds of metastable phases, namely, amorphous,nonequilibrium and quasicrystalline phases are formed in these alloys. The amorphous phase is formed in the range of 35 to 70 at% Ti and 0 to 25 at% Al. The nonequilibrium phases are formed in the composition range of 25 to 33 at% Ti. On the other hand, fine quasicrystalline phases are distributed in the amorphous matrix of the Ti-rich alloys. Crystallization temperatures and the hardness of the amorphous alloys were also examined.

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