scholarly journals Improving Elevated-Temperature Strength of an Al–Mn–Si Alloy by Strain-Induced Precipitation

Metals ◽  
2018 ◽  
Vol 8 (6) ◽  
pp. 446 ◽  
Author(s):  
Yangyang Zhang ◽  
Wei Jin ◽  
Xuanzhang Hao ◽  
Feng Qiu ◽  
Qinglong Zhao
Keyword(s):  
Elevated Temperature ◽  
Elevated Temperature Strength

Microstructural characterization of a rapidly solidified Al-Fe-V-Si alloy for elevated temperature applications

1988 ◽  
Vol 46 ◽  
pp. 550-551
Author(s):  
R. E. Franck ◽  
J. A. Hawk ◽  
G. J. Shiflet
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Grain Growth ◽  
Volume Fraction ◽  
Microstructural Characterization ◽  
Second Phase ◽  
Microstructural Stability ◽  
Elevated Temperature Strength ◽  
Temperature Applications

Rapid solidification processing (RSP) is one method of producing high strength aluminum alloys for elevated temperature applications. Allied-Signal, Inc. has produced an Al-12.4 Fe-1.2 V-2.3 Si (composition in wt pct) alloy which possesses good microstructural stability up to 425°C. This alloy contains a high volume fraction (37 v/o) of fine nearly spherical, α-Al12(Fe, V)3Si dispersoids. The improved elevated temperature strength and stability of this alloy is due to the slower dispersoid coarsening rate of the silicide particles. Additionally, the high v/o of second phase particles should inhibit recrystallization and grain growth, and thus reduce any loss in strength due to long term, high temperature annealing.The focus of this research is to investigate microstructural changes induced by long term, high temperature static annealing heat-treatments. Annealing treatments for up to 1000 hours were carried out on this alloy at 500°C, 550°C and 600°C. Particle coarsening and/or recrystallization and grain growth would be accelerated in these temperature regimes.

scholarly journals Enhancing elevated temperature strength of copper containing aluminium alloys by forming L12 Al3Zr precipitates and nucleating θ″ precipitates on them

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Surendra Kumar Makineni ◽  
Sandeep Sugathan ◽  
Subhashish Meher ◽  
Rajarshi Banerjee ◽  
Saswata Bhattacharya ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Aluminium Alloys ◽  
Elevated Temperature Strength

The Effect of Low-Angle and High-Angle Grain Boundaries on Elevated Temperature Strength

1994 ◽  
Vol 362 ◽  
Author(s):  
M. E. Kassner
Keyword(s):  
Elevated Temperature ◽  
Mechanical Behavior ◽  
Large Angle ◽  
High Angle ◽  
Elevated Temperature Strength ◽  
Ambient Temperatures ◽  
The Past ◽  
Creep Regime ◽  
New Evidence ◽  
General Opinion

AbstractThe influence of small (subgrain) misorientation interfaces on the mechanical behavior of metals and alloys deforming within the creep regime has been intensively studied over the past several decades. Controversies have existed, but some new experiments suggest, contrary to the general opinion, that low-angle boundaries are not associated with the rate controlling process for plasticity and do not affect strength. The new evidence will be discussed in terms of other established experimental trends. Large-angle boundaries may have a smaller effect on elevated temperature strength than at ambient temperatures and do not appear to dramatically affect elevated temperature strength. Superplastic effects are not addressed.

scholarly journals Microstructure and elevated-temperature strength of P/M Al-V-Fe-M(M=Ti,Cr or Si) alloys containing quasicrystalline phase.

1998 ◽  
Vol 45 (9) ◽  
pp. 817-823 ◽  
Author(s):  
Hisamichi Kimura ◽  
Akihisa Inoue ◽  
Kenichiro Sasamori ◽  
Yoshihito Kawamura ◽  
Teruaki Onogi ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Quasicrystalline Phase ◽  
Elevated Temperature Strength

Powder Processing of NiAl for Elevated Temperature Strength

1996 ◽  
Vol 460 ◽  
Author(s):  
J. Daniel Whittenberger ◽  
Peter Grahle ◽  
Eduard Arzt ◽  
Robert Behr ◽  
Klaus Zöltzer ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Grain Boundaries ◽  
Powder Processing ◽  
Hot Extrusion ◽  
Oxide Dispersion Strengthened ◽  
Gaseous Nitrogen ◽  
Elevated Temperature Strength ◽  
Alternative Means ◽  
Nial Powder ◽  
Nial Matrix

ABSTRACTIn an effort to superimpose two different elevated temperature strengthening mechanisms in NiAl, one lot of an oxide dispersion strengthened (ODS) NiAl powder has been milled in liquid nitrogen (cryomilled) to introduce A1N particles at the grain boundaries, and a second lot of ODS powder was simply roasted in gaseous nitrogen as an alternative means to produce AIN reinforced grain boundaries. Powder from both of these lots as well as the starting material have been consolidated by hot extrusion and tested at 1300 K. Both nitrogen roasting and cryomilling produced AIN within the ODS NiAl matrix which strengthened the alloy; however, based on the AIN content, cryomilling is more effective.

scholarly journals Properties of Novel High Temperature Titanium Alloys for Aerospace Applications

2020 ◽  
Vol 321 ◽  
pp. 04006
Author(s):  
John Mantione ◽  
Matias Garcia-Avila ◽  
Matthew Arnold ◽  
David Bryan ◽  
John Foltz
Keyword(s):  
Elevated Temperature ◽  
Titanium Alloys ◽  
Creep Resistance ◽  
Engine Performance ◽  
Beta Titanium Alloy ◽  
Elevated Temperature Strength ◽  
Jet Engine ◽  
Beta Titanium ◽  
Alpha Beta ◽  
Beta Titanium Alloys

The attractive combination of strength and low density has resulted in titanium alloys covering 15 to 25% of the weight of a modern jet engine, with titanium currently being used in fan, compressor and nozzle components. Typically, titanium alloys used in jet engine applications are selected from the group of near alpha and alpha-beta titanium alloys, which exhibit superior elevated temperature strength, creep resistance and fatigue life compared to typical titanium alloys such as Ti-6Al-4V. Legacy titanium alloys for elevated temperature jet engine applications include Ti-5Al-2Sn-2Zr-4Mo-4Cr, Ti-6Al-2Sn-4Zr-2Mo-0.1Si and Ti-4Al-4Mo-2Sn-0.5Si. Improving the mechanical behavior of these alloys enables improved component performance, which is crucial to advancing jet engine performance. As a world leader in supplying advanced alloys of titanium, nickel, cobalt, and specialty stainless steels, ATI is developing new titanium alloys with improved elevated temperature properties. These improved properties derive from precipitation of secondary intermetallics in alpha-beta titanium alloys. ATI has developed several new alpha-beta titanium alloy compositions which exhibit significantly improved elevated temperature strength and creep resistance. This paper will focus on the effects of chemistry and heat treat conditions on the microstructure and resulting elevated temperature properties of these new aerospace titanium alloys.

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