scholarly journals Deformation Mechanism of KCl Single Crystal by Spherical Indentor. II. Scratch with Steel Ball.

1992 ◽  
Vol 41 (465) ◽  
pp. 867-873
Author(s):  
Shinzo KOBAYASHI ◽  
Hideto KUSUNOKI ◽  
Sei MIURA
Keyword(s):  
Single Crystal ◽  
Deformation Mechanism ◽  
Steel Ball ◽  
Spherical Indentor

Creep Behavior of a 4.5% Re Nickel-Base Single Crystal Superalloy at High Temperature

2015 ◽  
Vol 750 ◽  
pp. 139-144 ◽  
Author(s):  
De Long Shu ◽  
Su Gui Tian ◽  
Xin Ding ◽  
Jing Wu ◽  
Qiu Yang Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Single Crystal ◽  
Deformation Mechanism ◽  
Creep Property ◽  
Single Crystal Superalloy ◽  
Micro Cracks ◽  
Initiation And Propagation ◽  
Temperature Ranges ◽  
Nickel Base

By means of heat treatment and creep property measurement, an investigation has made into the creep behaviors of a containing 4.5% Re nickel-base single crystal superalloy at high temperature. Results show that the elements W, Mo and Re are enriched in the dendrite arm regions, the elements Al, Ta, Cr and Co are enriched in the inter-dendrite region, and the segregation extent of the elements may be obviously reduced by means of heat treatment at high temperature. In the temperature ranges of 1070--1100 °C, the 4.5% Re single crystal nickel-based superallloy displays a better creep resistance and longer creep life. The deformation mechanism of the alloy during steady state creep is dislocations slipping in the γ matrix and climbing over the rafted γ′ phase. In the later stage of creep, the deformation mechanism of alloy is dislocations slipping in the γ matrix, and shearing into the rafted γ′ phase, which may promote the initiation and propagation of the micro-cracks at the interfaces of γ/γ′ phases up to the occurrence of creep fracture.

Deformation mechanism in ?Cu-Al single crystals with a spherical indentor

1991 ◽  
Vol 26 (14) ◽  
pp. 3945-3950 ◽  
Author(s):  
S. Kobayashi ◽  
T. Harada ◽  
S. Miura
Keyword(s):  
Single Crystals ◽  
Deformation Mechanism ◽  
Spherical Indentor

Creep Behaviors of a Single Crystal Nickel-Based Superalloy Containing 4.2%Re

2011 ◽  
Vol 689 ◽  
pp. 276-281 ◽  
Author(s):  
Su Gui Tian ◽  
Ben Jiang Qian ◽  
Fu Shun Liang ◽  
An An Li ◽  
Xing Fu Yu
Keyword(s):  
Single Crystal ◽  
Applied Stress ◽  
Microstructure Evolution ◽  
Deformation Mechanism ◽  
Stress Axis ◽  
Steady Creep ◽  
Nickel Based Superalloy ◽  
Microstructure Observation ◽  
Creep Curves ◽  
Main Deformation

By the measurement of creep curves and microstructure observation, an investigation has been made into the creep behaviors and microstructure evolution of a single crystal nickel-based superalloy containing 4.2%Re. Results show that the superalloy displays an obvious sensibility on the applied temperatures and stresses in the range of the applied temperatures and stresses. During the initial creep, the cubical g¢ phase in the alloy is transformed into an N-type rafted structure along the direction vertical to the applied stress axis. After crept up to fracture, the rafted g¢ phase in the region near fracture is transformed into a twisted configuration. The dislocation climbing over the rafted g¢ phase is considered to be the main deformation mechanism of the alloy during the steady creep state, and dislocations shear into the rafted g¢ phase is the main deformation mechanism of the alloy in the later stage of creep.

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