Training Effects on Damping Capacity in Mn-22.5mass%Cu-5mass%Ni-2mass%Fe Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 2026-2031 ◽  
Author(s):  
Yoshimi Watanabe ◽  
Yuusuke Suga ◽  
Eri Miura-Fujiwara ◽  
Hisashi Sato ◽  
Yoichi Nishino
Keyword(s):  
Thermal Cycling ◽  
Shape Memory ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Damping Capacity ◽  
Training Effects ◽  
Solution Treated ◽  
Free Decay ◽  
Lower Temperature ◽  
Thermal Training

The training treatments in the shape memory alloy are known as useful method to improve the shape memory effect. In our previous study, it was shown that the training treatments can also improve both the damping capacity and the hardness of the Fe–Mn alloy. In this study, training effects on damping capacity in solution treated Mn-22.5mass%Cu-5.08mass%Ni-1.96mass%Fe alloy have been investigated. As training treatments, the thermal training (only thermal cycling) and the thermo-mechanical training (thermal cycling with deformation) are carried out. Internal friction was measured at room temperature (R. T.) using a free-decay method. Although training effect cannot be found for the samples trained at higher annealing temperature (600 °C and 700 °C), damping capacity of the alloy is improved by thermal training annealed at 400 °C and 500 °C. The trade-off between the damping capacity and mechanical properties can be overcome by the training at lower temperature.

Training Effects on Damping Capacity in Fe-Mn and Fe-Mn-Cr Alloys

2010 ◽  
Vol 638-642 ◽  
pp. 2201-2206 ◽  
Author(s):  
Yoshimi Watanabe ◽  
Hisashi Sato ◽  
Yoichi Nishino ◽  
Ick Soo Kim
Keyword(s):  
Thermal Cycling ◽  
Shape Memory ◽  
Size Effects ◽  
Martensite Phase ◽  
Training Effect ◽  
Damping Capacity ◽  
Training Methods ◽  
Training Effects ◽  
Free Decay ◽  
Number Of Treatment

Training effect in the Fe-Mn-Si shape memory alloy is known as useful method to improve the shape memory effect. In this study, the training effects on damping capacity in Fe-20mass%Mn and Fe-20.5mass%Mn-12.5mass%Cr alloys have been investigated. As training treatments, the thermal training (only thermal cycling) and the thermo-mechanical training (thermal cycling with rolling deformation) are carried out. Internal friction was measured at room temperature using a free-decay method. Moreover, the behavior of dislocations was observed by TEM. Both training treatments improve the damping capacity of the Fe-Mn alloys with increasing the number of treatment. Strong training effect was found for the specimens trained by the thermo-mechanical training. The main training effect by thermal cycles is concluded to be due to size effects, while the size effects and volume fractional effects of martensite phase affect the damping capacity of the thermo-mechanically trained alloys. These training methods can improve both damping capacity and strength of Fe-Mn alloys.

Influence of Cobalt Addition on Microstructure and Damping Properties of Cu-Al-Ni Shape Memory Alloys

2020 ◽  
Vol 1010 ◽  
pp. 34-39
Author(s):  
Ying Ci Wee ◽  
Hamidreza Ghandvar ◽  
Tuty Asma Abu Bakar ◽  
Esah Hamzah
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Elastic Anisotropy ◽  
Mechanical Analysis ◽  
Damping Capacity ◽  
Damping Properties ◽  
Additional Element ◽  
Lower Temperature ◽  
Co Addition ◽  
High Degree

Copper-based shape memory alloys (SMAs) gaining attention due to their high damping properties during martensitic transformation and effective in energy dissipation which is applicable to damping application. However, copper-based SMAs such as the ternary Cu-Al-Ni are not easily deformed in the lower temperature martensitic phase which can be attributed to brittleness induced by coarse grain size, high degree of order and elastic anisotropy. Hence, this study aims to improve the properties of Cu-Al-Ni SMAs by addition of fourth alloying element. In this research, Cu-Al-Ni alloys with the addition of the fourth additional element, cobalt were prepared by casting. Microstructure characteristics of Cu-Al-Ni SMAs with and without Co addition were investigated via scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS) and x-ray diffraction (XRD). Damping capacity was determined by dynamic mechanical analysis (DMA). It was found that the alloy with 0.7wt% of Co addition showed the best improvement on the damping properties.

Microstructural Irreversibilities under Thermal Cycling in Ni-Ti-Fe Shape Memory Alloys

2011 ◽  
Vol 702-703 ◽  
pp. 888-891 ◽  
Author(s):  
Ritwik Basu ◽  
Lokendra Jain ◽  
Bikas Maji ◽  
Madangopal Krishnan ◽  
Karri V. Mani Krishna ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Thermal Cycling ◽  
Shape Memory ◽  
Room Temperature ◽  
Residual Deformation ◽  
Austenite Grain Size ◽  
Reversible Transformation ◽  
Martensite Content ◽  
Austenite Grain ◽  
Grain Misorientation

The thermal cycling (quenching in liquid nitrogen and reverting back to room temperature: austenite martensite reversible transformation) response of Ni-Ti-Fe shape memory alloys has been investigated. It was clearly noted that residual deformation, estimated in terms of noticeable differences in austenite grain size, depend on the relative clustering of fine grains. During repeated thermal cycling, the residual deformation, in-grain misorientation developments and retained martensite content scaled together: bringing out a clear picture of microstructural irreversibility.

Temperature Memory Effect of Ti-Ni-Hf-Y High Temperature Shape Memory Alloy

2017 ◽  
Vol 898 ◽  
pp. 598-603
Author(s):  
Jun Li ◽  
Xiao Yang Yi ◽  
Wei Hong Gao ◽  
Wen Long Song ◽  
Xiang Long Meng
Keyword(s):  
High Temperature ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Memory Effect ◽  
Thermal Cycle ◽  
Thermal Cycles ◽  
Solution Treated ◽  
Temperature Memory Effect ◽  
Lower Temperature ◽  
Complete Transformation

Temperature memory effect in the solution-treated Ti-Ni-Hf-Y high temperature shape memory alloy (HTSMA) was investigated. The results showed that the temperature memory effect induced by the partial cycling could be detected in the subsequent complete transformation cycling for the solution-treated Ti-Ni-Hf-Y alloy. The temperature memory effect is one-time phenomenon. However, the temperature memory effect could last at least 20 times when the sample was employed 10 times complete thermal cycles. Multiple-steps temperaure memory effect can be observed as the sample undergoes the lower temperature partial thermal cycle in sequence. The mechanisms of the temperature memory effect were discussed in this paper.

Mechanical Properties of Fe-Pd Ferromagnetic Shape Memory Alloy Thin Films Prepared by Dual Source DC Sputtering

2007 ◽  
Vol 539-543 ◽  
pp. 3173-3178 ◽  
Author(s):  
Shozo Inoue ◽  
Takahiro Namazu ◽  
T. Fujimoto ◽  
Keiji Koterazawa ◽  
Kanryu Inoue
Keyword(s):  
Thermal Cycling ◽  
Shape Memory ◽  
Applied Stress ◽  
Room Temperature ◽  
Recoverable Strain ◽  
Bias Stress ◽  
Before And After ◽  
Iced Water ◽  
Dual Source ◽  
Ferromagnetic Shape Memory

The purpose of this work is to quantitatively clarify the shape memory behavior of Fe-Pd films containing ~30at%Pd by thermal cycling testing under various constant stresses. Fe-Pd films (4 $m thick) were deposited onto Si wafers with thermally formed 1$m-thick SiO2 layer using a dual-source dc magnetron sputtering apparatus. The deposited films were all annealed at 900°C for 60 min followed by iced water quenching. Perfect shape recovery was observed for Fe-30.0at%Pd film when the applied stress was lower than 300 MPa. The maximum recoverable strain was ~0.6%. Fe-29.2at%Pd film, on the other hand, showed unrecovered strain after thermal cycling even if the applied stress was 40 MPa. XRD measurements of the Fe-29.2at% Pd film before and after thermal cycling revealed irreversible fcc-bct martensitic transformation that occurred during cooling process at a temperature around -80°C. The critical stress of Fe-Pd films, at which plastic deformation commences to occur, is higher for films with 30 at% Pd than for films with 29.2 at% Pd, which is practically advantageous. The Ms temperature of these films is lower than room temperature when no bias stress is applied, while it becomes higher than room temperature when appropriate bias stress is applied, obeying Clapeyron-Clausius law.

Mechanical Properties of Ti-Nb Biomedical Shape Memory Alloys Containing 13- and 14-Group Elements

2005 ◽  
Vol 475-479 ◽  
pp. 2329-2332 ◽  
Author(s):  
Hideki Hosoda ◽  
Yusuke Fukui ◽  
Tomonari Inamura ◽  
Kenji Wakashima ◽  
Shuichi Miyazaki
Keyword(s):  
Mechanical Properties ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Room Temperature ◽  
Solution Hardening ◽  
Good Shape ◽  
Solution Treated ◽  
Beta Titanium ◽  
Shape Memory Properties ◽  
Elongation To Failure

In order to replace Ti-Ni shape memory alloys, new biomedical shape memory alloys have been developed which are composed of beta titanium and nontoxic elements only. In this paper, experimental results of mechanical and shape memory properties are reported for the Ni-free Ti-18mol%Nb shape memory alloys containing 3mol% of 13-group and 14-group ternary elements in the periodic table. The ternary elements selected are Al, Ga, In, Ge and Sn. It was found that the solution treated alloys exhibit good shape memory effect but almost no pseudoelasticity at room temperature. Ultimate tensile strength and elongation to failure at room temperature are ranged from 250 to 710MPa and from 13 to 21%, respectively, depending on the kind of ternary elements. Effect of solution hardening on strength is discussed.

Influence of Thermal Cycling and Equivalent Heat Treatment on Amplitude Dependence of Internal Friction in Cu-Al-Mn Shape Memory Alloys

2008 ◽  
Vol 137 ◽  
pp. 137-144 ◽  
Author(s):  
Agnieszka Mielczarek ◽  
Marcin Marczyk ◽  
Werner Riehemann
Keyword(s):  
Heat Treatment ◽  
Internal Friction ◽  
Shape Memory Alloys ◽  
Thermal Cycling ◽  
Shape Memory ◽  
Room Temperature ◽  
Thermal Stresses ◽  
Parent Phase ◽  
Chemical Compositions ◽  
Amplitude Dependence

The influence of thermal cycling between - 196 °C and 200 °C and equivalent heat treatment at 200 °C on the amplitude dependence of internal friction at room temperature has been studied in as cast Cu – Al - Mn shape memory alloys with different chemical compositions. Using X-ray diffraction one composition was found to be austenitic and two others martensitic with two martensite types (2H and 18R) at room temperature. All specimens were thermally cycled for 100 times. During one thermal cycle the specimen underwent altogether two phase transformations one in each direction. Thermal cycling causes microstructural changes in the specimens due to atomic reordering, thermal stresses, which are generated in the martensitic state due to the anisotropy of thermal expansion, or due to the nucleation and propagation of interphase cracks in parent phase. During repeated thermal cycling the transition peaks obtained in mechanical spectroscopy became narrower due to an enduring change of the microstructure and annealing effect at 200 °C. To compare between the effects of thermal cycling and heat treatment one martensitic specimen was annealed at 200 °C. For selected cycle numbers and heat treatment times the amplitude dependence of damping was measured at room temperature. The influence of thermal cycling of martensitic specimens on the damping level was found to be similar to the influence of heat treatment at 200 °C. It is most likely that the highest heat treatment temperature is more important for the amplitude dependence of damping than the temperature change during thermal cycling. Cracks due to thermal cycling were found in all cycled specimens. They have no significant effect on the amplitude dependence of damping of the martensitic samples, whereas some small influence could be observed in austenitic samples at room temperature.

Influence of Heat Treatment on the Damping Capacity of Fe-Ga Wires

2012 ◽  
Vol 629 ◽  
pp. 165-170
Author(s):  
Mei Ling Fang ◽  
Jie Zhu ◽  
Ji Heng Li ◽  
Chao Gan ◽  
Ming Ming Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Cooling Rate ◽  
Strain Amplitude ◽  
Annealing Temperature ◽  
Damping Capacity ◽  
Torsion Pendulum ◽  
Free Decay ◽  
Computer Controlled ◽  
Access To The Field ◽  
Noise And Vibration Reduction

The influence of heat treatment on damping capacity of (Fe83Ga17)99.5B0.5 wires was investigated using a computer-controlled automatic inverted torsion pendulum. The measurements have been carried out as a function of strain amplitude in free-decay mode. The microstructures of (Fe83Ga17)99.5B0.5 wires were also investigated to clarify the effects of heat treatment on the damping capacity. The results show that the annealing temperature affects the damping capacity of (Fe83Ga17)99.5B0.5 wires by varying the grain size. With increasing annealing temperature, the damping capacity is enhanced and becomes more sensitive to strain amplitude. There is no obvious difference in the structure of (Fe83Ga17)99.5B0.5 wires with different cooling rate which indeed affects the damping properties. Large cooling rate will help to get higher damping capacity. The Fe-Ga alloys show certain damping capacity and are worth paying close attention to enhance this property so as to get access to the field of unwanted noise and vibration reduction applications.

Deformation Behavior of Functionally Graded Ti-Ni Shape Memory Alloys

2007 ◽  
Vol 544-545 ◽  
pp. 211-214 ◽  
Author(s):  
Tae Hyun Nam ◽  
Hyun Gon Kim ◽  
Ju Young Choi ◽  
Jung Moo Lee ◽  
Suk Bong Kang ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Thermal Cycling ◽  
Shape Memory ◽  
Yield Stress ◽  
Deformation Behavior ◽  
Annealing Temperature ◽  
Tensile Tests ◽  
Constant Load ◽  
Functionally Graded ◽  
Ni Alloy

Deformation behavior of temperature gradient anneal(TGA) treated Ti-50.0Ni(at%) alloys were investigated by means of thermal cycling tests under constant load and tensile tests. TGA treated Ti-Ni alloy wires showed a sequential deformation behavior along the length of the specimen since the stress required for the B2-B19’ transformation increased with decreasing annealing temperature. Considerably large residual elongation(about 0.4 %) occurred in the TGA treated Ti-Ni alloy under the applied stress of 80 MPa, which is ascribed to the fact that yield stress of the sample annealed at 823 K is lower than the stress required for the B2-B19’ transformation of the sample annealed at 658 K.

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