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 Abnormal Grain Growth Induced by Cyclic Heat Treatment and Fabrication of Cu-Based Shape Memory Alloy Single Crystal

Materia Japan ◽  
2019 ◽  
Vol 58 (3) ◽  
pp. 137-143
Author(s):  
Toshihiro Omori ◽  
Tomoe Kusama ◽  
Sumio Kise ◽  
Toyonobu Tanaka ◽  
Yoshikazu Araki ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Shape Memory Alloy ◽  
Single Crystal ◽  
Shape Memory ◽  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Alloy Single Crystal ◽  
Cyclic Heat Treatment ◽  
Cyclic Heat

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

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

Grain growth of Cu-Al-Mn shape memory alloy in ß phase with manganese silicide precipitates

1992 ◽  
Vol 26 (8) ◽  
pp. 1285-1290
Author(s):  
F.J. Gil ◽  
J.M. Guilemany ◽  
J. Nutting ◽  
I. Sanchiz ◽  
F. Peregrin
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Grain Growth ◽  
Manganese Silicide

Determination of Recrystallization Kinetics and Activation Energy of Grain Growth Process of Cu-14Al-4Ni Shape Memory Alloy

2015 ◽  
Vol 1765 ◽  
pp. 127-132 ◽  
Author(s):  
Emmanuel P. R. Lima ◽  
Pedro C. de Lima ◽  
Marcelo Nava
Keyword(s):  
Activation Energy ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Grain Growth ◽  
Growth Process ◽  
Treatment Time ◽  
Mechanical Tests ◽  
A Value ◽  
Kinetics Of

ABSTRACTThe non-ferrous shape memory alloys have, normally, two problems that hinder its use in industrial scale: the natural aging and grains growth. The first degrades the memory effect, while the second, observed during the processing of alloy, modifies the temperatures which the transformations occur. Thus, the study of kynetic of recrystallization is important for enabling the control of hardened state in function of treatment time, without causing excessive grain growth. Therefore, the objective of this study is to determine the kinetics of recrystallization of Cu-14Al-4Ni shape memory alloy, based on an empirical law of the formation of Jonhson-Mehl-Avrami, as well as their activation energies for grain growth process according to the empirical Arrhenius law. The alloy was vacuum melted in an induction furnace. After casting, the bulk samples of the alloy were homogenized for 24 hours, solubilized and hot rolled followed by water-quenching to initiate the recrystallization. Then, different samples were annealed at temperatures close to the peak, start and end of the DSC curve. Following the heat treatments, the samples were submitted to mechanical tests and the values of the properties were correlated to the fraction transformed for determination of recrystallization’s kinetic. For the characterization of the grain growth process, analyses in optical microscopy were accomplished and all annealed samples were examined by statistical metallography and the grain sizes were measured. After measurements, the ln[-ln(1-Yrec)] x ln(t) and the ln [D-Do] x 1/T diagrams were plotted to determine the parameters of Jonhson-Mehl-Avrami equation and the activation energy of the process, respectively. The results showed that the equation of the recrystallized fraction follows the empiric law of the formation of Jonhson-Mehl-Avrami for the considered property, as well as, also showed that the alloy Cu-14Al-4Ni is extremely sensitive to temperature variation in which the alloy is treated, having a dual kinetics of grain growth. In the first domain, between 670 and 710°C, the diagram provides a value for the activation energy equal to 39.32 KJ/mol, in the second domain, between 710 and 790°C, the diagram provides a value for the activation energy equal to 9.01 KJ/mol.

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

The effects of microelements on the grain refining and the grain growth behaviors of CuZnAl shape memory alloy

1991 ◽  
Vol 25 (11) ◽  
pp. 2565-2570 ◽  
Author(s):  
F.T. Wang ◽  
F.X. Chen ◽  
Z.G. Wei ◽  
D.Z. Yang
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Grain Growth ◽  
Grain Refining
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