scholarly journals The fcc/hcp Relative Phase Stability in the Fe-Mn-Co System : Martensitic Transformation Temperatures, Assessment of Gibbs Energies and Thermodynamic Calculation of T0 Lines

1997 ◽  
Vol 07 (C5) ◽  
pp. C5-405-C5-410 ◽  
Author(s):  
A. Baruj ◽  
A. Fernandez Guillermet ◽  
M. Sade
Keyword(s):  
Martensitic Transformation ◽  
Phase Stability ◽  
Thermodynamic Calculation ◽  
Relative Phase ◽  
Transformation Temperatures ◽  
Gibbs Energies

scholarly journals Ab initioinvestigation of monoclinic phase stability and martensitic transformation in crystalline polyethylene

2018 ◽  
Vol 2 (7) ◽  
Author(s):  
Pär A. T. Olsson ◽  
Per Hyldgaard ◽  
Elsebeth Schröder ◽  
Elin Persson Jutemar ◽  
Eskil Andreasson ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Phase Stability ◽  
Monoclinic Phase ◽  
Crystalline Polyethylene

Investigation of Ageing Phenomena in CuAlNi Based Shape Memory Alloys

2007 ◽  
Vol 537-538 ◽  
pp. 129-136 ◽  
Author(s):  
Marton Benke ◽  
Valéria Mertinger ◽  
E. Nagy ◽  
Jan Van Humbeeck
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Ternary Alloy ◽  
Room Temperature ◽  
Beta Phase ◽  
Heat Treatments ◽  
Thermoelastic Martensitic Transformation ◽  
Transformation Temperatures ◽  
Exothermic Process

The ageing phenomena and its effect on the thermoelastic martensitic transformation was investigated in three Cu-base SMAs. The transformation temperatures shifted to higher temperatures due to aging in the beta-phase. To increase the alloy’s ductility, a definite amount of Mn (4 wt%) and Fe (2 wt%) were added to the ternary alloy. The thermoelastic martensitic transformation was found in the not-aged samples of the CuAlNiMn and CuAlNiMnFe alloys. This transformation was destroyed due to ageing heat treatments by a fairly unknown exothermic process. The thermoelastic martensitic transformation appeared again in the aged CuAlNiMn and CuAlNiMnFe samples after keeping them on room temperature for a few months. This phenomena was investigated by DSC, SEM, TEM, and XRD.

Martensitic Transformation Behavior and Shape Memory Effect of an Aged Ni-rich Ti-Ni-Hf High Temperature Shape Memory Alloy

2008 ◽  
Vol 138 ◽  
pp. 399-406 ◽  
Author(s):  
Xiang Long Meng ◽  
Yu Dong Fu ◽  
Wei Cai ◽  
J.X. Zhang ◽  
Qing Fen Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Aging Temperature ◽  
Transformation Behavior ◽  
Transformation Temperatures ◽  
Solution Treated

The martensitic transformation behavior and shape memory effect (SME) have been investigated in a Ni-rich Ti29.6Ni50.4Hf20 high temperature shape memory alloy (SMA) in the present study. After aging, the transformation temperatures of Ti29.6Ni50.4Hf20 alloy increase obviously due to the precipitation of (Ti,Hf)3Ni4 particles. And the transformation sequence changes from one-step to two-step. When the experimental alloy is aged at different temperatures for 2h, the transformation temperatures increase rapidly with increasing the aging temperature and then change slightly with further increasing the aging temperature. Most of the martensite variants preferentially oriented in the aged Ti29.6Ni50.4Hf20 alloy. The aged Ti29.6Ni50.4Hf20 alloy shows the better thermal stability of transformation temperatures than the solution-treated one because the precipitates depress the introduction of defects during thermal cycling. In addition, the proper aged Ti29.6Ni50.4Hf20 alloy also shows the larger SME than the solution-treated one since the precipitates strengthen the matrix strongly.

Martensitic Transformation in Mn-Ni-Sn Alloys

2013 ◽  
Vol 738-739 ◽  
pp. 468-472
Author(s):  
R. Coll ◽  
J. Bonastre ◽  
J. Saurina ◽  
J.J. Suñol ◽  
L. Escoda ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Diffraction Analysis ◽  
Structural Transformation ◽  
Tetragonal Phase ◽  
Melt Spinning ◽  
Monoclinic Phase ◽  
X Ray Diffraction ◽  
Transformation Temperatures ◽  
X Ray ◽  
A Minor

In this work, we analyze two Mn50Ni50-xSnx alloys with Sn content i.e., x = 5 and 7.5 respectively. These alloys are produced as ribbon-shape by melt spinning. Their structural transformation is checked by calorimetry. Martensitic transformation temperatures of these alloys strongly depend on the composition. From X-ray diffraction analysis, the 14M monoclinic phase is the main phase in both alloys, but in the alloy Sn5 appears a minor tetragonal phase too.

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