Saturated solid-solution hardening behavior of Ir–Hf–Nb refractory superalloys for ultra-high temperature applications

2006 ◽  
Vol 54 (1) ◽  
pp. 115-119 ◽  
Author(s):  
J.B. Sha ◽  
Y. Yamabe-Mitarai
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Solid Solution Hardening ◽  
Solution Hardening ◽  
Hardening Behavior ◽  
Ultra High Temperature ◽  
Temperature Applications

Martensitic Transformation of High-Entropy and Medium-Entropy Shape Memory Alloys

2021 ◽  
Vol 1016 ◽  
pp. 1802-1810
Author(s):  
Hiromichi Matsuda ◽  
Masayuki Shimojo ◽  
Hideyuki Murakami ◽  
Yoko Yamabe-Mitarai
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Transformation Temperature ◽  
Solid Solution Hardening ◽  
Solution Hardening ◽  
High Entropy ◽  
The One

As new generation of high-temperature shape memory alloys, high-entropy alloys (HEAs) have been attracted for strong solid-solution hardened alloys due to their severe lattice distortion and sluggish diffusion. TiPd is the one potential high-temperature shape memory alloys because of its high martensitic transformation temperature above 500 °C. As constituent elements, Zr expected solid-solution hardening, Pt expected increase of transformation temperature, Au expected keeping transformation temperature, and Co expected not to form harmful phase. By changing the alloy composition slightly, two HEAs and two medium entropy alloys (MEAs) were prepared. Only two MEAs, Ti45Zr5Pd25Pt20Au5, and Ti45Zr5Pd25Pt20Co5 had the martensitic transformation. The perfect recovery was obtained in Ti45Zr5Pd25Pt20Co5 during the repeated thermal cyclic test, training, under 200 MPa. On the other hand, the small irrecoverable strain was remained in Ti45Zr5Pd25Pt20Au5 during the training under 150 MPa because of the small solid-solution hardening effect. It indicates that Ti45Zr5Pd25Pt20Co5 is the one possible HT-SMA working between 342 and 450 °C.

Solid Solution Hardening Effect of Ir

2005 ◽  
Vol 475-479 ◽  
pp. 703-706 ◽  
Author(s):  
Yoko Yamabe-Mitarai ◽  
Tomohiro Maruko ◽  
Tomoaki Miyazawa ◽  
Tosiyuki Morino
Keyword(s):  
Solid Solution ◽  
Compressive Strength ◽  
High Temperature ◽  
Lattice Parameter ◽  
Solid Solution Hardening ◽  
Parameter Change ◽  
Solution Hardening ◽  
Melting Temperatures ◽  
High Temperature Materials ◽  
Hardening Effect

Solid solution hardening effects of Ir was investigated to develop high temperature materials at 2223 K. Pt, Rh, Hf, and Zr were chosen as second elements because their solubility into Ir at 2223 K is over 2at% and the melting temperatures of Ir solid solution are above 2273 K. Compressive strength of Ir solid solution at 2223K were investigated. Solid solution hardening effect of Ir is discussed in terms of lattice parameter change and solubility,

Effect of Ta addition on microstructure and mechanical properties of dual two-phase Ni3Al-Ni3V intermetallic alloy–Retraction

MRS Advances ◽  
2019 ◽  
Vol 4 (25-26) ◽  
pp. 1509-1514 ◽  
Author(s):  
Kazushige Ioroi ◽  
Yasuyuki Kaneno ◽  
Takayuki Takasugi
Keyword(s):  
Solid Solution ◽  
Volume Fraction ◽  
Intermetallic Alloy ◽  
The Other ◽  
Solid Solution Hardening ◽  
Solution Hardening ◽  
Two Phase ◽  
Atomic Size ◽  
Microstructural Observation ◽  
Hardening Behavior

ABSTRACTMechanism for the hardening of two-phase Ni3Al-Ni3V intermetallic alloy to which 2 at.% Ta was added in different substitution manners for Ni, Al and V was presented, based on the microstructural observation, alloying behavior and lattice properties of the additive in the constituent phases. The hardening behavior was explained in terms of solid solution hardening in which the mixture rule in the volume fraction of the two constituent phases and the atomic size misfit evaluated from the changes of the lattice parameters were incorporated. Consequently, the hardening for the alloys in which the additives were substituted for Ni and V was attributed to solid solution hardening. On the other hand, the hardening for the alloy in which the additive was substituted for Al was attributed to the hardening due to microstructural refining in addition to the solid solution hardening.

Current Status of Mo-Si-B Silicide Alloys for Ultra-high Temperature Applications

2008 ◽  
Vol 1128 ◽  
Author(s):  
Martin Heilmaier ◽  
Holger Saage ◽  
Manja Krüger ◽  
Pascal Jehanno ◽  
Mike Böning ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Current Status ◽  
Processing Step ◽  
First Results ◽  
Ductile To Brittle Transition ◽  
Grain Boundary Embrittlement ◽  
Solid Solution Matrix ◽  
Ultra High Temperature ◽  
Temperature Applications

AbstractWe review the current development status of molybdenum borosilicide (Mo-Si-B) alloys for ultra-high temperature applications in air. The assessment of several ingot and powder metallurgy approaches revealed that (i) the presence of a continuous Mo solid solution matrix is mandatory for adequate low temperature toughness and (ii) wrought processing of such alloys at temperatures established for refractory metals requires the presence of an ultrafine (sub-micron) microstructure. Both prerequisites could be fulfilled using mechanical alloying (MA) as the crucial processing step , however, values for the ductile-to-brittle transition temperature (DBTT) below 800°C could not be obtained due to grain boundary embrittlement by Si segregation. First results on the effect of different microalloying additions on a reduction of this segregation exemplified for the Mo solid solution will be presented and discussed.

A Tem Study of Slip Systems in MoSi2/WSi2 Alloys

1991 ◽  
Vol 49 ◽  
pp. 942-943
Author(s):  
Stuart A. Maloy
Keyword(s):  
Solid Solution ◽  
Solid Solution Hardening ◽  
Slip Systems ◽  
High Melting ◽  
Group 14 ◽  
Solution Hardening ◽  
Brittle To Ductile Transition ◽  
High Melting Temperature ◽  
Tetragonal Unit Cell ◽  
Structural Applications

MoSi2 has recently been investigated as a potential material for high temperature structural applications. It has excellent oxidation resistance up to 1700°C, a high melting temperature, 2030°C, and a brittle-to-ductile transition temperature at 900-1000°C. WSi2 is isomorphous with MoSi2 and has a body-centered tetragonal unit cell of the space group 14/mmm. The lattice parameters are a=3.20 Å and c=7.84 Å for MoSi2 and a=3.21 Å and c=7.88 Å for WSi2. Therefore, WSi2 was added to MoSi2 to improve its strength via solid solution hardening. The purpose of this study was to investigate the slip systems in polycrystalline MoSi2/WSi2 alloys.

Solid solution hardening and softening in MoSi2 alloys

2001 ◽  
Vol 44 (6) ◽  
pp. 879-884 ◽  
Author(s):  
A.A Sharif ◽  
A Misra ◽  
J.J Petrovic ◽  
T.E Mitchell
Keyword(s):  
Solid Solution ◽  
Solid Solution Hardening ◽  
Solution Hardening ◽  
Hardening And Softening
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