Microstructure and Properties of Eutectic Composites Based on (Ti, Nb)3 (Al, Si) and (Ti, Nb)5 (Si, Al)3

1990 ◽  
Vol 213 ◽  
Author(s):  
R. Wagner ◽  
M. Es-Souni ◽  
D. Chen ◽  
B. Dogan ◽  
J. Seeger ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Intermetallic Phases ◽  
Oxidation Behaviour ◽  
High Temperature Creep ◽  
Alloying Additions ◽  
Microstructure And Properties ◽  
Temperature Creep ◽  
High Temperature Mechanical Properties ◽  
Microstructure And Mechanical Properties

ABSTRACTPrevious work has shown that ternary Ti-Al-Si alloys with hypoeutectic and eutectic microstructures containing the intermetallic phases Ti3 (Al,Si) and Ti5 (Si,Al)3 have promising high temperature mechanical properties [1]. In the present investigation alloying additions of Niobium have been made to selected Ti-Al-Si alloys based on hypoeutectic compositions and the effects of Niobium on the microstructure and mechanical properties have been studied. The high temperature creep and oxidation behaviour of such alloys appears to be superior to that of currently available Ti3Al-based alloys.

scholarly journals The Influence of La and Ce on Microstructure and Mechanical Properties of an Al-Si-Cu-Mg-Fe Alloy at High Temperature

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 384
Author(s):  
Andong Du ◽  
Anders E. W. Jarfors ◽  
Jinchuan Zheng ◽  
Kaikun Wang ◽  
Gegang Yu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
High Temperature ◽  
Intermetallic Phases ◽  
High Temperature Strength ◽  
Thermal Expansion Mismatch ◽  
Strengthening Mechanisms ◽  
High Temperature Mechanical Properties ◽  
Minor Contribution ◽  
A Minor

The effect of lanthanum (La)+cerium (Ce) addition on the high-temperature strength of an aluminum (Al)–silicon (Si)–copper (Cu)–magnesium (Mg)–iron (Fe)–manganese (Mn) alloy was investigated. A great number of plate-like intermetallics, Al11(Ce, La)3- and blocky α-Al15(Fe, Mn)3Si2-precipitates, were observed. The results showed that the high-temperature mechanical properties depended strongly on the amount and morphology of the intermetallic phases formed. The precipitated tiny Al11(Ce, La)3 and α-Al15(Fe, Mn)3Si2 both contributed to the high-temperature mechanical properties, especially at 300 °C and 400 °C. The formation of coarse plate-like Al11(Ce, La)3, at the highest (Ce-La) additions, reduced the mechanical properties at (≤300) ℃ and improved the properties at 400 ℃. Analysis of the strengthening mechanisms revealed that the load-bearing mechanism was the main contributing mechanism with no contribution from thermal-expansion mismatch effects. Strain hardening had a minor contribution to the tensile strength at high-temperature.

Microstructure and High Temperature Mechanical Properties of Inconel 617

2007 ◽  
Vol 544-545 ◽  
pp. 411-414 ◽  
Author(s):  
Tae Sun Jo ◽  
Gil Su Kim ◽  
Young Ik Seo ◽  
Woo Seog Ryu ◽  
Young Do Kim
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Oxide Layer ◽  
Tube Material ◽  
Internal Oxide ◽  
High Temperature Mechanical Properties ◽  
Microstructure And Mechanical Properties ◽  
Inconel 617 ◽  
Second Phases ◽  
High Temperature Gas

Inconel 617 is a candidate tube material for high temperature gas-cooled reactors (HTGR). The microstructure and mechanical properties of Inconel 617 were studied after exposure at high temperature of 1050oC. The dominant oxide layer was Cr-oxide. The internal oxide and Crdepleted region were observed below the Cr-oxide layer. The major second phases are M23C6 and M6C types of carbides. The composition of M23C6 and M6C were determined to be Cr21Mo2C6 and Mo3Cr2(Ni,Co)1C, respectively, by EDS. These carbides are coarsened during exposure. M6C carbide is more stable than M23C6 at high temperature. There was not much change in mechanical properties after exposure at 1050oC for 1000 h.

A Review of Rafting in Nickel-Based Single Crystal Superalloys

2017 ◽  
Vol 263 ◽  
pp. 41-49
Author(s):  
Zhi Yuan Yu ◽  
Zhu Feng Yue ◽  
Wei Cao ◽  
Xin Mei Wang
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Single Crystal ◽  
Numerical Simulations ◽  
Critical Review ◽  
High Temperature Creep ◽  
Major Work ◽  
Creep Properties ◽  
Temperature Creep ◽  
Directional Coarsening

Nickel-based single crystal superalloys have been widely used in modern aircraft, which is related to its high temperature mechanical strength and creep properties. And the initial cubic γ′ precipitates start to coarsen directionally during high temperature creep, which results in the degradation of the mechanical properties, especially the creep properties. Therefore, it is essential to figure out the mechanism of directional coarsening during the period of high temperature creep. In this article, a broad review of rafting mechanism of nickel-based single crystal superalloys is provided. The major work of this critical review is to introduce several experiments and numerical simulations which are used to analyze the evolution of rafting. For three different numerical simulations, their performance, advantage and disadvantage are discussed in detail. Through methods above, the effect on creep properties is summarized.

scholarly journals Recovery of Microstructure and Mechanical Properties of Service Run GTD-111 DS Buckets

1999 ◽  
Author(s):  
N. S. Cheruvu ◽  
V. P. Swaminathan ◽  
C. D. Kinney
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Solution Treatment ◽  
Partial Solution ◽  
Treatment Temperature ◽  
Solution Treatment Temperature ◽  
High Temperature Solution ◽  
Microstructure And Properties ◽  
Microstructure And Mechanical Properties ◽  
Temperature Solution

Degradation of microstructure and mechanical properties of a service run GTD-111 DS blade was evaluated. The blade was coated with a CoCrAlY coating (GT-29) and had operated on a GE Model MS 5002 engine for 54,850 hours. To recover the microstructure of the degraded blade, the effect of solution treatment temperature on the microstructure and properties was evaluated. The blanks removed from the airfoil tip section were given a commonly used partial solution treatment 2050°F (1120°C) for GTD-111 and a high temperature solution treatment 2175°F (1190°C) prior to the partial solution and aging treatments. Microstructure and creep test results of these heat treated specimens revealed that the high temperature solution treatment was necessary to recover the microstructure and properties of in-service degraded GTD-111 DS buckets.

Study of Mechanical Properties and Fracture Mechanism of a New High-Temperature Alloys

2012 ◽  
Vol 271-272 ◽  
pp. 64-68
Author(s):  
Dong Xu Zhang ◽  
Da Shun Liu ◽  
Xi Ping Zhu
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Base Metal ◽  
Creep Test ◽  
Arc Welding ◽  
Tensile Fracture ◽  
High Temperature Creep ◽  
Temperature Creep ◽  
Welding Joints ◽  
High Temperature Tensile

GH3230 is a new type of superalloy,it is the first study about it. This paper studied the high temperature mechanical properties of the GH3230 base metal and argon-arc welding joints by high temperature tensile test,high temperature creep test and SEM analyses. The results showed thatthe ultimate tensile strength of GH3230 argon-arc welding joints is about 85.6% of that of base metal under the same conditions. In the high temperature creep test, GH3230 argon-arc welding joints had a longer creep life than that of base metal. Both GH3230 base metal and argon-arc welding joints showed a ductile fracture. High temperature tensile fracture is cavities fracture and high temperature creep fracture is intergranular fracture. The deformation of GH3230 argon-arc welding joints is much more uniformited and smaller than that of base material, and GH3230 argon-arc welding joints has less cracks.

Nanoanalysis of precipitation in a modified Inconel 718 alloy

1994 ◽  
Vol 52 ◽  
pp. 702-703
Author(s):  
J. Liu ◽  
J. X. Dong ◽  
M. Z. Chen ◽  
X. S. Xie
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Inconel 718 ◽  
Analytical Electron Microscopy ◽  
Intermetallic Phases ◽  
Nickel Base Superalloy ◽  
Microstructural Stability ◽  
Inconel 718 Alloy ◽  
High Temperature Mechanical Properties ◽  
Nickel Base

The nickel-base superalloy Inconel 718 (IN718) is strengthened primarily by precipitation of two types of intermetallic phases in the austenite (γ) matrix: metastable γ' (cubic Ll2 structure) and γ" (tetragonal D022 structure) precipitates. Minor changes of the chemistry of the IN718 alloy can significantly affect its mechanical properties at high temperatures. It has been found that the microstructural stability of the precipitates and the high temperature performance of IN718 depend critically on the (Ti+Al)/Nb and Al/Ti ratios. The small sizes of these intermetallic phases and the fact that γ' precipitates are frequently associated with γ" precipitates in modified IN718 make it difficult to determine their composition. In this study, nanometer resolution analytical electron microscopy techniques have been used to characterize the structure, the morphology and the composition of the precipitated phases.The fabrication and the heat treatment of the modified IN718 alloy and its high temperature mechanical properties have been reported elsewhere.

Influences of Al, Ce on the Microstructure and Mechanical Properties of As-Cast Mg-6Zn Alloy

2013 ◽  
Vol 747-748 ◽  
pp. 470-477
Author(s):  
Rui Dong Liu ◽  
Xu Guang Dong ◽  
Fu Jun Wei ◽  
Yuan Sheng Yang
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Yield Strength ◽  
Ultimate Strength ◽  
Magnesium Alloys ◽  
Room Temperature ◽  
Volume Fraction ◽  
High Temperature Mechanical Properties ◽  
Microstructure And Mechanical Properties ◽  
Al Addition

The effects of minor Al and Ce on the microstructures, room-temperature and high-temperature mechanical properties of as-cast Mg-6Zn magnesium alloys were investigated. With the Al addition into Mg-6Zn alloy, the coarse eutectic Mg51Zn20phases were refined and distributed discontinuously. After adding 0.5wt.% Ce into Mg-6Zn-1Al alloy, a new needle-like Al2CeZn2phase was observed. Meanwhile, the volume fraction of Mg51Zn20phase decreased and the semi-continuous Mg51Zn20phase became discontinuous globular morphology. It has been observed that the addition of Ce element coarsens the grains, and 1wt.% Al addition enhanced the yield strength and ultimate strength from 86.35MPa, 229MPa to 90.7MPa, 238MPa, respectively. Moreover, the Ce addition can significantly increase the high-temperature mechanical properties of cast Mg-6Zn-1Al alloy.

Effect of а Number of Transition Metals on the Cohesive Properties of Cr-Ni-Base Alloys

2016 ◽  
Vol 879 ◽  
pp. 1998-2002 ◽  
Author(s):  
V.N. Butrim ◽  
V.I. Razumovskiy ◽  
A.G. Beresnev ◽  
A.S. Trushnikova ◽  
I.M. Razumovskii
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
High Temperature ◽  
Ab Initio Calculations ◽  
Base Alloy ◽  
Two Phase ◽  
Alloying Additions ◽  
High Temperature Mechanical Properties ◽  
Cohesive Properties ◽  
Theoretical Predictions

We used the results of ab initio calculations to improve the high temperature mechanical properties of a Cr-Ni-base alloy (Cr-33Ni-2W-0,3Ti-0,3V, wt.%) (alloy I) with two-phase α - γ microstructure. It was established that γ – phase in Cr-Ni-base alloy (I) plays a key role in the processes of plastic deformation. By analogy with Ni-base superalloys the bulk and grain boundaries cohesion in γ – phase of the Cr-Ni-base alloy (I) were strengthened by adding a package of the “low alloying” elements (Zr, Hf, Nb, Ta) (alloy II) chosen in accordance with our theoretical predictions. We further investigated an influence of a sum (Ta, Nb, Hf, Zr) like the low alloying additions on the mechanical properties of Cr-Ni-base alloy (I). The results of mechanical testing revealed a significant strengthening of the alloy (II) in comparison with (I) at the temperature 1080 oC in accordance with our predictions. We also investigated the microstructure’s peculiarities of the alloys (I) and (II).

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