[PDF] Top 20 Competitividad económica, gobierno y competitividad fiscal
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Evolution of the martensitic transformation in shape memory alloys under high strain rates
... The transformation from a phase to the other is triggered when the material is undergoing variation of temperature or mechanical sol- licitation, or ...the transformation, the mother phase and the daughter ... See full document
15
Effect of Alloying Elements on fcc/hcp Martensitic Transformation and Shape Memory Properties in Co Al Alloys
... Ni, Nb, Mo, Ta or W) ternary alloys. The ductility declines with the addition of Cr and Si, while it is improved by the addition of other elements. This result is obviously related to the fact that the hcp ... See full document
61
Martensitic Transformations and Superelastic Behavior at Low Temperatures in Ti50−xNi40+xCu10 Shape Memory Alloys
... The transformation temperatures by DSC measurements are listed in Table ...M transformation become unobvious for x ² 1.0 alloys, the O and M transformation temperatures decrease with ... See full document
76
Damping Capacities of Ti50Ni50−xCux Shape Memory Alloys Measured under Temperature, Strain, and Frequency Sweeps
... the high strain dependent part comes from the dislocations overcome “several rows” of pinning ...B19 transformation are higher than those for B19A martensite and B2¼B19A transformation, ... See full document
197
Effect of Nb Addition on Shape Memory Behavior of Ti–Mo–Ga Alloys
... (1–4)Nb alloys subjected to heat treatment at 1073 K for 120 ...Ti–6Mo–3Ga–(1–3)Nb alloys exhibit the shape memory effect at the first ...of strain recovered superelastically during ... See full document
136
Effect of Nb Addition on Martensitic Transformation Behavior of AuTi 15Co Based Biomedical Shape Memory Alloys
... phase transformation behavior and shape memory behavior of Au-50 mol % Ti-15 mol % Co (AuTiCo) alloys is ...maximum transformation strain evaluated in 2 mol % Nb-added AuTiCo is ... See full document
10
Martensitic Transformation of Ti50Ni25 XPd25 YCuX+Y Quaternary Shape Memory Alloys with X, Y≤q 10 at%
... broadest transformation peak, as shown in ...For high annealing temperature (higher than 973 K), both Ms temperature and Hc value increase with increasing the annealing temperature and the ... See full document
121
Nuclear Magnetic Resonance Studies of Martensitic Phase Transformation in Ni Ti Shape Memory Alloys
... present in the sample but there is no remaining R-phase. This fraction of austenite transforms then very slowly into marten- site but the quantity involved is so small and the transforma- tion rate so low that it cannot ... See full document
19
Experimental Consideration of Multistage Martensitic Transformation and Precipitation Behavior in Aged Ni Rich Ti Ni Shape Memory Alloys
... Ti-50.6 at%Ni alloy was prepared from 99.7 mass% sponge Ti and 99.9 mass% electrolytic Ni by a high- frequency vacuum induction furnace using a graphite crucible, followed by casting into an iron mold. The ingot ... See full document
59
Acoustic Emission as a Probe of the Kinetics of the Martensitic Transformation in a Shape Memory Alloy
... a shape memory alloy has been ...out under continu- ous cooling conditions. The transformation temperatures derived from the AE data are compared with the results obtained by means of DSC, and ... See full document
189
Comparison of Stress-induced Martensitic Transformation Under Tension and Compression in Fe-28Mn-6Si-Cr Shape Memory Alloy
... stress-induced martensitic transformation behaviour under different loading modes at various strain rates, quasi-static and impact tension and compression at room temperature are ... See full document
79
Effect of Nb Content on Martensitic Transformation Temperatures and Mechanical Properties of Ti Ni Nb Shape Memory Alloys for Pipe Joint Applications
... transformation temperatures also depend on the Ni/Ti ratio, heat treatment condition and cold working rate. Furthermore, in the alloy with Nb content of 6 mol% and Ni/Ti atomic ratio being less than 1.05, the ... See full document
155
Atomic Dynamics and Energetics of Martensitic Transformation in Nickel–Titanium Shape Memory Alloy
... with shape memory effect (SME), Ni–Ti alloy is well known and well used in engineering ...on martensitic transformation and reverse one induced by temperature change and applied ...of ... See full document
151
Infrared imaging of TiNi shape memory alloy subjected to deformation at various temperatures
... inhomogeneous Martensitic forward transformation recorded during the SMA loading (1 - 5), whereas bands of significantly lower temperature, corresponding to the endothermic reverse transformation, ... See full document
10
Martensitic Transformation in Ti Rich Ti Pd Shape Memory Alloys
... planes in the parent phase. The three variants are clearly ob- served in the Ti–47 at%Pd alloy aged at 873 K for 1.8 ks as shown in Fig. 9. The aging temperature is about 20 K higher than A1 ∗ . The nucleation of the ... See full document
120
Effect of Internal Strain on Martensitic Transformations in NiTi Shape Memory Alloys
... in the sample. We were not able to directly localize the R- phase due to small distances between the R-phase and matrix spots. They are too small to separate the R-phase spot by the objective aperture and take the dark ... See full document
146
Effect of Alloy Composition on Microstructure and Martensitic Transformation Temperature of a Zr-Cu Shape Memory Alloy
... Residual strain recovery behavior in shape memory alloys (SMAs) can be induced by a reversible martensitic transformation (MT) of specific intermetallic ...some alloys ... See full document
10
Martensitic Transformation in Shape Memory Alloys under Magnetic Field and Hydrostatic Pressure
... at%Ni alloys were produced by melting the component metals in a high frequency induc- tion furnace under argon atmosphere and casting into a wa- ter cooled iron ...tic martensitic ... See full document
137
Two Stage Martensitic Transformation in Thermal Cycled Ti40 5Ni49 5Hf10 Shape Memory Alloy
... TiNi-based shape memory alloys (SMAs) are the most noticeable SMAs due to their superior properties in shape memory effect, pseudoelasticity and damping ...these alloys is limited ... See full document
117
Influence of Nb Addition on Phase Constitution and Mechanical Properties of Biomedical Ti Zr Based Alloys
... The alloys are named in the manner of TZnN, which is meant as Ti-Zr based alloys with n mol % Nb addition, ...electrode under high purity argon ...ks under Ar flow condition, and ... See full document
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