Amorphization and crystallization characteristics of TiNi shape memory alloys by severe plastic deformation

doi:10.1007/s11706-009-0053-9

Front Mater Sci Chin

2009, Vol. 3

Issue (3) : 325-328 https://doi.org/10.1007/s11706-009-0053-9

RESEARCH ARTICLE

Amorphization and crystallization characteristics of TiNi shape memory alloys by severe plastic deformation

Jun-tao LI¹(

), Wei-dong MIAO¹, Yu-ling HU¹, Yan-jun ZHENG², Li-shan CUI²

1. General Research Institute for Nonferrous Metals, Grikin Advanced Materials Co., Ltd., Beijing 102200, China; 2. Departments of Materials Science and Engineering, China University of Petroleum, Beijing 102249, China

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Abstract

Differential scanning calorimetry (DSC) was used to determine the crystallization fraction and rate in TiNi alloys by severe plastic deformation. Results showed that the reverse martensitic transformation peak was not observed during the first heating at the rate of 40 K/min in the as-rolled samples, but one exothermic peak was observed at 620 K, which was associated with the amorphous crystallization process. During the second heating, reverse martensitic transformation was recovered. The onset crystallization temperature was low in the initial stage of crystallization with lower heating rates, but the crystallization fraction was found to increase with increasing temperature. However, the crystallization fraction was almost constant in the initial stage of crystallization with a relatively high heating rate. In all heating rates, the amorphous crystallization rates almost always reached maximum as the volumetric fraction of amorphous crystallization rose to 50%.

Keywords shape memory alloy cold deformation nanocrystallization amorphization

Corresponding Author(s): LI Jun-tao,Email:ljtdxr@yahoo.com.cn

Issue Date: 05 September 2009

Cite this article:

Jun-tao LI,Wei-dong MIAO,Yu-ling HU, et al. Amorphization and crystallization characteristics of TiNi shape memory alloys by severe plastic deformation[J]. Front Mater Sci Chin, 2009, 3(3): 325-328.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-009-0053-9
https://academic.hep.com.cn/foms/EN/Y2009/V3/I3/325

Fig.1 DSC curves of the 70% rolled sample. The lower inset is an enlarged DSC curve from the dotted area in first heating curve, which shows the presence of exothermic heat.

Tab.1 Fitted parameters with Boltzmann function of the onset crystallization temperature of amorphous TiNi alloy under different applied heating rates

Fig.2 DSC curves of amorphous-to-nanocrystalline in the 70% rolled sample at different heating rates (as indicated)

Fig.3 Comparison of the experimental data and fitted curve with the Boltzmann function of the onset crystallization temperature under different heating rates

Fig.4 Amorphous crystallization fraction of 70% rolled sample at different heating rates

Fig.5 Amorphous crystallization rates at different heating rates versus temperature curves

Fig.6 Amorphous crystallization fraction at different heating rates versus time curves

Fig.7 Amorphous crystallization rates at different heating rates versus time curves

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[1]	LI Juntao, ZHENG Yanjun, CUI Lishan. Transformation characteristics of TiNi/TiNi alloys synthesized by explosive welding[J]. Front. Mater. Sci., 2007, 1(4): 351-355.

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