scholarly journals Effect of Al Content on Abnormal Grain Growth and Superelasticity in Fe–Mn–Al–Cr–Ni Shape Memory Alloys with Near-Zero Temperature-Dependence of Transformation Stress

2021 ◽  
Vol 7 (3) ◽  
pp. 402-413
Author(s):  
Ji Xia ◽  
Toru Hoshi ◽  
Xiao Xu ◽  
Toshihiro Omori ◽  
Ryosuke Kainuma
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Temperature Dependence ◽  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Zero Temperature ◽  
Al Content ◽  
Transformation Stress

Some structural effects related to the abnormal grain growth in FeMnAlNi shape memory alloys

2019 ◽  
Vol 19 ◽  
pp. 931-940
Author(s):  
Mihai Popa ◽  
Bogdan Pricop ◽  
Elena Mihalache ◽  
Vasile Dănuț Cojocaru ◽  
Radu-Ioachim Comăneci ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Structural Effects

scholarly journals Role of β(FeAl) nanoparticles in abnormal grain growth in the annealing of cast Cu-Al-Mn-Fe shape memory alloys

2020 ◽  
Vol 30 (4) ◽  
pp. 510-516
Author(s):  
Shuiyuan Yang ◽  
Xinyu Qing ◽  
Jixun Zhang ◽  
Lipeng Guo ◽  
Shen Hong ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Grain Growth ◽  
Abnormal Grain Growth

Abnormal grain growth in Fe–Mn–Al–Ni shape memory alloy with higher Al content

2020 ◽  
Vol 187 ◽  
pp. 355-359 ◽  
Author(s):  
Ji Xia ◽  
Toshihiro Omori ◽  
Ryosuke Kainuma
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Al Content

scholarly journals Promoting abnormal grain growth in Fe-based shape memory alloys through compositional adjustments

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
M. Vollmer ◽  
T. Arold ◽  
M. J. Kriegel ◽  
V. Klemm ◽  
S. Degener ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Grain Growth ◽  
Abnormal Grain Growth

scholarly journals Grain Growth, Porosity, and Hardness Changes in Sintered and Annealed Binder-jet 3D Printed Ni-Mn-Ga Magnetic Shape Memory Alloys

2020 ◽  
Vol 26 (S2) ◽  
pp. 3082-3085
Author(s):  
Aaron Acierno ◽  
Jakub Toman ◽  
Katerina Kimes ◽  
Amir Mostafaei ◽  
Mirko Boin ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Grain Growth ◽  
Magnetic Shape Memory ◽  
Magnetic Shape Memory Alloys ◽  
3D Printed

Low-cost Cu-based shape memory single crystals obtained by abnormal grain growth showing excellent superelasticity

Materialia ◽  
2019 ◽  
Vol 5 ◽  
pp. 100200 ◽  
Author(s):  
Shuiyuan Yang ◽  
Jixun Zhang ◽  
Mengyuan Chi ◽  
Yuhua Wen ◽  
Xinren Chen ◽  
...  
Keyword(s):  
Shape Memory ◽  
Single Crystals ◽  
Grain Growth ◽  
Low Cost ◽  
Abnormal Grain Growth

Temperature Dependence and Martensitic Transformation of Ti50Pt50 Shape Memory Alloys

2014 ◽  
Vol 1019 ◽  
pp. 379-384
Author(s):  
M.P. Mashamaite ◽  
Hasani Rich Chauke ◽  
Rosinah Mahlangu ◽  
P.E. Ngoepe
Keyword(s):  
Molecular Dynamics ◽  
High Temperature ◽  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Temperature Dependence ◽  
Effect Of Temperature ◽  
Displacive Transformation ◽  
B2 Phase ◽  
Recent Experimental Work

Shape memory alloys (SMAs) are a fascinating group of metals that have two remarkable properties, the shape memory effect and superelasticity. The TiPt structure with the B2 phase has been reported to undergo a reversible displacive transformation to B19 martensite at about 1200K. However, this system could serve in principle as the basis of high-temperature shape memory alloys. Molecular dynamics study of martensitic transformation in platinum titanium alloys was performed to investigate the effect of temperature dependence on B2 and B19 structures at 50 at.%Pt. The NPT ensemble was used to determine the properties of these systems and we found good comparisons with recent experimental work. The temperature dependence of TiPt shows potential martensitic change when B19 is heated to extreme high temperatures of 273K up to 1573K.

Iron-based superelastic alloys with near-constant critical stress temperature dependence

Science ◽  
2020 ◽  
Vol 369 (6505) ◽  
pp. 855-858 ◽  
Author(s):  
Ji Xia ◽  
Yuki Noguchi ◽  
Xiao Xu ◽  
Takumi Odaira ◽  
Yuta Kimura ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Temperature Dependence ◽  
Critical Stress ◽  
Outer Space ◽  
Alloy System ◽  
Large Temperature ◽  
Superelastic Behavior ◽  
Iron Based ◽  
Metal Shape

Shape memory alloys recover their original shape after deformation, making them useful for a variety of specialized applications. Superelastic behavior begins at the critical stress, which tends to increase with increasing temperature for metal shape memory alloys. Temperature dependence is a common feature that often restricts the use of metal shape memory alloys in applications. We discovered an iron-based superelastic alloy system in which the critical stress can be optimized. Our Fe-Mn-Al-Cr-Ni alloys have a controllable temperature dependence that goes from positive to negative, depending on the chromium content. This phenomenon includes a temperature-invariant stress dependence. This behavior is highly desirable for a range of outer space–based and other applications that involve large temperature fluctuations.

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