scholarly journals Creep behavior using Ti-TiB in situ composites.

2002 ◽  
Vol 14 (1/2) ◽  
pp. 57-58
Author(s):  
Kumi Endo ◽  
Jun-ichi MATSUSHITA ◽  
Kenshi KAWABATA ◽  
Eiichi SATO ◽  
Kazuhiko KURIBAYASHI
Keyword(s):  
Creep Behavior ◽  
In Situ Composites

Creep Mechanisms in Niobium-Silicide Based In-Situ Composites

1998 ◽  
Vol 552 ◽  
Author(s):  
B. P. Bewlay ◽  
P. W. Whiting ◽  
A. W. Davis ◽  
C. L. Briant
Keyword(s):  
Creep Rate ◽  
Creep Behavior ◽  
Detrimental Effect ◽  
Higher Order ◽  
In Situ Composites ◽  
Niobium Silicide ◽  
Creep Mechanisms ◽  
Stress Levels ◽  
The Relationship

ABSTRACTThis paper will discuss the relationship between microstructure and creep behavior in hightemperature niobium-silicide based in-situ composites. The creep behavior of composites generated from binary Nb-Si alloys, and higher order alloys containing Mo, Hf and Ti additions, will be described. In-situ composites were tested in compression at temperatures up to 1200°C and stress levels in the range 70 to 280MPa. It was found that the Hf concentration can be increased to 7.5 with little increase in creep rate, over that for the binary Nb3Si-Nb composite, but at higher concentrations the creep rate is increased at stress levels higher than 21OMPa. At stresses less than 21OMPa the Ti concentration can be increased to 21 without a detrimental effect on creep performance, but at higher concentrations there is a substantial increase in the creep rate.

The Effect of Silicide Volume Fraction on the Creep Behavior of Nb-Silicide Based In-Situ Composites

2000 ◽  
Vol 646 ◽  
Author(s):  
B.P. Bewlay ◽  
C.L. Briant ◽  
A.W. Davis ◽  
M.R. Jackson
Keyword(s):  
High Temperature ◽  
Creep Rate ◽  
Creep Behavior ◽  
Volume Fraction ◽  
Phase Volume ◽  
In Situ Composites ◽  
Volume Fractions ◽  
Stress Levels

ABSTRACTThis paper will describe the creep behavior of high-temperature Nb-silicide in-situ composites based on quaternary Nb-Hf-Ti-Si alloys. The effect of volume fraction of silicide on creep behavior, and the effects of Hf and Ti additions, will be described. The composites were tested in compression at temperatures up to 1200°C and stress levels in the range 70 to 280 MPa. At high (Nb) phase volume fractions the creep behavior is controlled by deformation of the (Nb) and, as the volume fraction of silicide is increased, the creep rate is reduced. However, at large silicide volume fractions (>0.7) damage in the silicide begins to degrade the creep performance. The creep rate has a minimum at a volume fraction of ∼0.6 silicide. The creep performance of the monolithic and silicide phases will also be discussed.

Fabrication, characterization and analysis of improvements in mechanical properties of AA7075/ZrB2 in-situ composites

Measurement ◽  
2019 ◽  
Vol 136 ◽  
pp. 356-366 ◽  
Author(s):  
M. Nallusamy ◽  
S. Sundaram ◽  
K. Kalaiselvan
Keyword(s):  
Mechanical Properties ◽  
In Situ Composites

In Situ Tests on Creep Behavior of Rock Mass with Joint or Shearing Zone in Foundation of Large-Scale Hydroelectric Projects

2004 ◽  
Vol 261-263 ◽  
pp. 1097-1102 ◽  
Author(s):  
Jian Liu ◽  
Xia Ting Feng ◽  
Xiu Li Ding ◽  
Huo Ming Zhou
Keyword(s):  
Rock Mass ◽  
Creep Behavior ◽  
Large Scale ◽  
Time Dependent ◽  
Three Gorges Project ◽  
Three Gorges ◽  
The Three Gorges ◽  
The Three Gorges Project

The time-dependent behavior of rock mass, which is generally governed by joints and shearing zones, is of great significance for engineering design and prediction of long-term deformation and stability. In situ creep test is a more effective method than laboratory test in characterizing the creep behavior of rock mass with joint or shearing zone due to the complexity of field conditions. A series of in situ creep tests on granite with joint at the shiplock area of the Three-Gorges Project and basalt with shearing zone at the right abutment of the Xiluodu Project were performed in this study. Based on the test results, the stress-displacement-time responses of the joints and basalt are analyzed, and their time-dependent constitutive model and model coefficients are given, which is crucial for the design to prevent the creep deformations of rock masses from causing the failure of the operation of the shiplock gate at the Three-Gorges Project and long-term stability of the Xiluodu arc dam.

scholarly journals Microcantilever Fracture Tests on Eutectic NiAl–Cr(Mo) In Situ Composites

2021 ◽  
pp. 2001464
Author(s):  
Stefan Gabel ◽  
Sven Giese ◽  
Benoit Merle ◽  
Ioannis Sprenger ◽  
Martin Heilmaier ◽  
...  
Keyword(s):  
In Situ Composites ◽  
Fracture Tests

Manufacture and Microstructures of Fe-Cr-C Hypereutectic In Situ Composites

2007 ◽  
Vol 336-338 ◽  
pp. 1406-1408 ◽  
Author(s):  
Xiao Hui Zhi ◽  
Jian Dong Xing ◽  
Yi Min Gao ◽  
Xiao Jun Wu ◽  
Xiao Le Cheng
Keyword(s):  
Hypereutectic Alloy ◽  
Reinforced Composites ◽  
In Situ Composites ◽  
In Situ Composite ◽  
Particle Reinforced Composites ◽  
Primary Carbides

In the present study, a Fe-Cr-C hypereutectic alloy was prepared from industry-grade materials and subjected to modification and fluctuation, through which new types of particle reinforced composites, hypereutectic in-situ composite, was generated. The structures of the composite modified or not with the range of fluctuation addition from 0% to 2.8wt.%, were investigated. The primary carbides were refined with the addition of modifying agents and fluctuations. Increasing the amount of fluctuation resulted in finer primary carbides. At 1380oC, with the addition of modifying agents and 2.8wt.% fluctuation addition, the structure was well modified.

Microstructural characterization and mechanical properties of Nb–Ti–C–B in-situ composites with W addition

2015 ◽  
Vol 646 ◽  
pp. 332-340 ◽  
Author(s):  
Xinjiang Zhang ◽  
Yibin Li ◽  
Xiaodong He ◽  
Xueran Liu ◽  
Qiong Jiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Microstructural Characterization ◽  
In Situ Composites
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