Microstructure and thermokinetics analysis of combustion synthesized AlN

1999 ◽  
Vol 14 (5) ◽  
pp. 1944-1948 ◽  
Author(s):  
Kexin Chen ◽  
Changchun Ge ◽  
Jiangtao Li ◽  
Wenbin Cao
Keyword(s):  
High Temperature ◽  
Reaction Mechanism ◽  
Combustion Synthesis ◽  
Thermodynamic Analysis ◽  
Combustion Process ◽  
Temperature Structure ◽  
Subsequent Reaction ◽  
Microstructural Observation ◽  
High Temperature Structure

The mechanism for combustion synthesis (CS) of AlN was investigated in the present paper. A novel quenching technique was developed to retain the high-temperature structure formed in the sample during the combustion process. Based on the microstructural observation of the quenched specimen and thermodynamic analysis, a two-step reaction mechanism for CS AlN, i.e., vaporization of Al and subsequent reaction with N2, is proposed.

Improving Convergence of Replica-Exchange Simulations through Coupling to a High-Temperature Structure Reservoir

2007 ◽  
Vol 3 (2) ◽  
pp. 557-568 ◽  
Author(s):  
Asim Okur ◽  
Daniel R. Roe ◽  
Guanglei Cui ◽  
Viktor Hornak ◽  
Carlos Simmerling
Keyword(s):  
High Temperature ◽  
Replica Exchange ◽  
Temperature Structure ◽  
High Temperature Structure

High Temperature Structure Stability Study on Nb-Containing Nickel-Base Superalloys

2007 ◽  
Vol 546-549 ◽  
pp. 1281-1288 ◽  
Author(s):  
Xi Shan Xie ◽  
Jian Xin Dong ◽  
Mai Cang Zhang ◽  
Shu Hong Fu
Keyword(s):  
High Temperature ◽  
Phase Formation ◽  
Inconel 718 ◽  
Phase Changes ◽  
Stable Phase ◽  
Structure Stability ◽  
Temperature Structure ◽  
Alloy 718 ◽  
Strengthening Phases ◽  
High Temperature Structure

High temperature structure stability of 2 important Nb-containing Ni-base superalloys Inconel 718 (Ni-19Cr-18Fe-3Mo-5Nb-1Ti-0.5Al) and Inconel 740 (Ni-25Cr-20Co-0.5Mo-2Nb -1.8Ti-0.8Al) have been studied on the relationship of microstructure to mechanical properties via SEM, TEM, SAD, XRD and quantitative determination of precipitated phases by micro-chemical analysis. The longest exposure times are 50,000hrs at 650°C for Alloy 718 and 4,000hrs at 704°C, 725°C and 760°C for Alloy 740. The structure instabilities for these 2 Alloys are: 1) strengthening phases γ″/γ′ coarsening; 2) meta-stable strengthening phases change to stable phase, such as γ″→ δ-Ni3Nb for Alloy 718 and γ′→ η-Ni3Ti for Alloy 740; 3) embrittling phases formation, such as α-Cr and σ-phase formation in Alloy 718 and high Si-containing G-phase formation in Alloy 740. On the base of understanding phase changes at high temperature exposures the structure stability of Inconel 718 and Inconel 740 has been improved both by minor adjustment of alloys chemistry. The modifications of Alloy 718 and Alloy 740 are to be developed in the near future.

Unusual complex high temperature structure of Fe2VSi

2006 ◽  
Vol 417 (1-2) ◽  
pp. 150-154 ◽  
Author(s):  
O. Nashima ◽  
Y. Yamaguchi ◽  
H. Higashi ◽  
T. Goto ◽  
T. Kaneko ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Structure ◽  
High Temperature Structure

High-temperature structure formation in cement depending on curing time

2017 ◽  
Author(s):  
Aleksey Gnyrya ◽  
Yuri Abzaev ◽  
Sergey Korobkov ◽  
Dmitrjy Mokshin ◽  
Kseniya Gauss ◽  
...  
Keyword(s):  
High Temperature ◽  
Structure Formation ◽  
Temperature Structure ◽  
Curing Time ◽  
High Temperature Structure
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