scholarly journals Uncovering the creep deformation mechanism of rock-forming minerals using nanoindentation

2021 ◽  
Author(s):  
Zhaoyang Ma ◽  
Chengpeng Zhang ◽  
Ranjith Pathegama Gamage ◽  
Guanglei Zhang
Keyword(s):  
Creep Deformation ◽  
Deformation Mechanism

Microstructures and Creep of AM50-Sb-Gd Alloys

2005 ◽  
Vol 488-489 ◽  
pp. 749-752 ◽  
Author(s):  
Su Gui Tian ◽  
Keun Yong Sohn ◽  
Hyun Gap Cho ◽  
Kyung Hyun Kim
Keyword(s):  
Activation Energy ◽  
Creep Rate ◽  
Stress Exponent ◽  
Creep Behavior ◽  
Creep Deformation ◽  
Deformation Mechanism ◽  
Creep Resistance ◽  
Fine Particles ◽  
Dislocation Climb ◽  
The Matrix

Creep behavior of AM50-0.4% Sb-0.9%Gd alloy has been studied at temperatures ranging from 150 to 200°C and at stresses ranging from 40 to 90 MPa. Results show that the creep rate of AM50-0.4%Sb-0.9%Gd alloy was mainly controlled by dislocation climb at low stresses under 50 MPa. The activation energy for the creep was 131.2 ± 10 kJ/mol and the stress exponent was in the range from 4 to 9 depending on the applied stress. More than one deformation-mechanism were involved during the creep of this alloy. Microstructures of the alloy consist of a–Mg matrix and fine particles, distinguished as Mg17Al12, Sb2Mg3, and Mg2Gd or Al7GdMn5 that were homogeneously distributed in the matrix of the alloy, which effectively reduced the movement of dislocations, enhancing the creep resistance. Many dislocations were identified to be present on non-basal planes after creep deformation.

scholarly journals Creep Deformation Mechanism of P/M Al-8 mass%Fe Alloy

1992 ◽  
Vol 56 (4) ◽  
pp. 390-398 ◽  
Author(s):  
Fuyuki Yoshida ◽  
Norio Matsuda ◽  
Keisuke Matsuura
Keyword(s):  
Creep Deformation ◽  
Deformation Mechanism

Evaluation of Creep Deformation Mechanism of Heat Resistant Steel by Stress Change Test

2007 ◽  
Author(s):  
Hiroyuki Hayakawa ◽  
Satoshi Nakashima ◽  
Junichi Kusumoto ◽  
Akihiro Kanaya ◽  
Daisuke Terada ◽  
...  
Keyword(s):  
Creep Rate ◽  
Dislocation Density ◽  
Creep Deformation ◽  
Deformation Mechanism ◽  
Mobile Dislocation ◽  
Stress Increment ◽  
Mobile Dislocation Density ◽  
Creep Tests ◽  
Heat Resistant ◽  
Heat Resistant Steels

In order to evaluate creep deformation mechanism of heat resistant steels, stress change tests were conducted during creep tests. In this study, it was confirmed that the dislocation behavior during the creep tests was in viscous manner, because no instantaneous plastic strain was observed at stress increments. Transient behavior was observed after stress changes for all kinds of steel in this work. Mobility of dislocation was evaluated by the observed backward creep behavior after stress reduction. Internal stress was evaluated by the change of creep rate in stress increment, and mobile dislocation density was evaluated with the estimated mobility of dislocation and the change of creep rate in stress increment. It was found that the variation of mobile dislocation density during creep deformation showed the same tendency as the variation of creep rate. Therefore mobile dislocation density is the dominant factor that influences the creep rate variation in creep deformation of heat resistant steels investigated in this work. The mobility of dislocation showed a good correlation with 1/T and it is related with the amount of solute Mo that is a solution strengthening element. Microstructure of crept specimens was observed by TEM to discuss the validation of these results.

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