Effects of Fe Addition on the Phase Transformation Internal Friction in Ni-Al-Based Alloys

2021 ◽  
Vol 888 ◽  
pp. 91-95
Author(s):  
Zheng Cun Zhou ◽  
Jie Du ◽  
Su Yi Gu ◽  
Xiao Bin Zhu ◽  
Yi Fei Yang
Keyword(s):  
Phase Transformation ◽  
Internal Friction ◽  
Low Frequency ◽  
Peak Height ◽  
Peak Temperature ◽  
Chemical Compositions ◽  
Fe Content ◽  
Mechanical Spectrum ◽  
Friction Measurements ◽  
Fe Addition

The influences of chemical compositions on the internal friction of phase transformation were investigated for the quenched Ni-Al-based alloys. The internal friction measurements were completed using a low-frequency mechanical spectrum apparatus through forced vibration method. It was shown that the chemical compositions have the great influences on the internal friction of phase transition for the oil-cooled Ni-Al-based alloys. The peak-temperature of internal friction is lowered, and the peak-height is increased and the peak-width is narrowed when Fe content is elevated. The reducing of the peak-temperature is attributed to the increase of stability of γ phase due to the addition of Fe. The changes of the parameters of the peak are also related to the Aleq (equivalent Al) contents.

Effect of Purity on Dislocation-Induced Relaxations in Molybdenum Single Crystals

2015 ◽  
Vol 363 ◽  
pp. 106-111
Author(s):  
Shigeru Suzuki ◽  
Alfred Seeger
Keyword(s):  
Internal Friction ◽  
Single Crystals ◽  
High Purity ◽  
Low Frequency ◽  
Activation Process ◽  
Dislocation Interaction ◽  
Dissolved Carbon ◽  
Dislocation Pinning ◽  
Friction Measurements ◽  
Substitutional Impurities

Dislocation-induced relaxations in different molybdenum single crystals were investigated by means of low-frequency internal friction measurements in the temperature range of 20–600 K. The results indicated that the appearance of the dislocation-induced relaxations strongly depends on the purity of the molybdenum, although the intrinsic dislocation relaxations appeared at about 100 K and 450 K in the high-purity molybdenum. The molybdenum containing a small amount of carbon did not exhibit the intrinsic dislocation relaxations but rather revealed a modulus increase due to the dislocation pinning caused by the dissolved carbon. When the molybdenum containing a small amount of carbon was annealed up to 700 K, a new relaxation peak appeared at about 450 K. The activation process for this relaxation indicated that it could be attributed to the relaxation due to a carbon-dislocation interaction. In addition, it was shown that the dislocation-induced relaxations in medium-purity molybdenum were small, which was attributed to the residual substitutional impurities in the molybdenum.

scholarly journals Internal Friction of Li7La3Zr2O12 Based Lithium Ionic Conductors

2016 ◽  
Vol 61 (1) ◽  
pp. 21-24
Author(s):  
X.P. Wang ◽  
L. Song ◽  
J. Hu ◽  
Y.P. Xia ◽  
Y. Xia ◽  
...  
Keyword(s):  
Internal Friction ◽  
Tetragonal Phase ◽  
Diffusion Processes ◽  
Low Frequency ◽  
Peak Height ◽  
Cubic Phase ◽  
Ionic Conductors ◽  
Internal Friction Peak ◽  
Lithium Ions ◽  
Diffusion Mechanisms

The diffusion mechanisms of lithium ions in tetragonal phase as well as in Al and Nb stabilized cubic Li7La3Zr2O12 compounds were investigated by low-frequency internal friction technique. In the cubic Li7La3Zr2O12 phase, a remarkable relaxation-type internal friction peak PC with a peak height up to 0.12 was observed in the temperature range from 15°C to 60°C. In the tetragonal phase however, the height of the PT peak dropped to 0.01. The obvious difference of the relaxation strength between the cubic and tetragonal phases is due to the different distribution of lithium ions in lattice, ordered in the tetragonal phase and disordered in the cubic phase. Based on the crystalline structure of the cubic garnet-type Li7La3Zr2O12 compound, it is suggested that the high internal friction peak in the cubic phase may be attributed to two diffusion processes of lithium ions: 96h↔96h and 96h↔24d.

Phase transformation in BST ceramics investigated by internal friction measurements

2005 ◽  
Vol 25 (13) ◽  
pp. 3203-3206 ◽  
Author(s):  
H. Frayssignes ◽  
B.L. Cheng ◽  
G. Fantozzi ◽  
T.W. Button
Keyword(s):  
Phase Transformation ◽  
Internal Friction ◽  
Bst Ceramics ◽  
Friction Measurements

Frequency Dependence of the Internal Friction for Ti50Ni48.5Fe1.5 Shape Memory Alloy

2010 ◽  
Vol 143-144 ◽  
pp. 1007-1011
Author(s):  
Ting Yong Xing ◽  
Xu Jun Mi ◽  
Xiang Qian Yin ◽  
Bao Dong Gao ◽  
Yan Feng Li
Keyword(s):  
Phase Transformation ◽  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Internal Friction ◽  
Shape Memory ◽  
Frequency Dependence ◽  
Internal Friction Peak ◽  
Interesting Phenomenon ◽  
Measuring Frequency ◽  
Friction Measurements

The objective of this work is to investigate the influence of measuring frequency on the internal friction of Ti50Ni48.5Fe1.5 shape memory alloy. The DSC, DC electrical resistivity and internal friction measurements were employed to characterize the sample in this study. Comparing the DSC result, the two internal friction peaks were confirmed which are corresponding to the R-phase transformation and martensitic transformation of Ti50Ni48.5Fe1.5 alloy during the cooling process, respectively. The height of internal friction peak corresponding to martensitic transformation increased with decreasing of measuring frequency. But, the height of the internal friction peak corresponding to R-phase transformation exhibited little measuring frequency dependence. Meanwhile, the value of the relative modulus peaks of the specimen increased with measuring frequency increasing. Furthermore, there was an interesting phenomenon that the martensitic transformation finish temperature shifted to higher temperature side with increasing of measuring frequency. It could be associated with the variation of applied vibration energy.

Effect of Fe on Phase Transformation of Low Temperature Cu-Al-Mn Memory Alloy

2011 ◽  
Vol 687 ◽  
pp. 474-479
Author(s):  
Kun Peng Zhu ◽  
Ning Hu ◽  
Fu Shun Liu
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Sharp Increase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fe Content ◽  
Heat Treated ◽  
Scanning Electron ◽  
Al Matrix ◽  
Fe Addition

The influence of Fe addition on the phase transformation and the microstructure of Cu67Al27-XMn6FeXshape memory alloys are investigated by means of electrical resistivity, X-ray diffraction, scanning electron microscopy and microhardness test. It was shown that the Ms (Martensitic start transformation) temperature of the 850°C heat-treated alloy exhibit a sharp increase as Fe content increases, by comparison with the alloy without heat-treatment. For example, after 850°C heat-treatment, the Ms temperature of the alloy increases from 52K to 135K when Fe is added from 0 at.% to 1.5 at.%. The microstructure of as-homogenized Cu67Al27-XMn6FeXalloys consists of Cu3Al matrix, γ2(Cu9Al4) and α (Cu) phases. Fe element was distributed in precipitates and matrix.

Sign in / Sign up

Export Citation Format

Share Document