کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5455347 | 1514640 | 2017 | 31 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effects of second phases on superelastic behavior of TNTZ bio alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The effects of second phases on superelastic behavior of TNTZ bio alloy The effects of second phases on superelastic behavior of TNTZ bio alloy](/preview/png/5455347.png)
چکیده انگلیسی
The present work was conducted to investigate the effects of second phases on the stability of β phase and superelastic behavior of a Ti-Nb-Ta-Zr (TNTZ) bio-alloy. For this purpose, the as-hot forged material was subjected to different thermal treatments. These included solution annealing, aging treatments at 500 °C for 48 h, and annealing at 850 °C for 45 min followed by quenching in water and ethanol solution, to obtain alpha (α) precipitate and αⳠmartensite, respectively, as the second phase in the β phase structure. These ended to different microstructures. The superelastic behavior of single β phase structure showed pseudoelastic (S) ratio of 20%. Furthermore, the precipitation of α phase reduced the S ratio to 6%. The α phase decreased the superelasticity by impeding the stress induced martensite (SIM) formation at the loading stage. On the other hand, the athermal αⳠmartensite, didn't significantly change superelasticity of β phase, (S ratio = 18%). The dissimilarity of α precipitate and αⳠmartensite in changing the superelastic behavior of the β phase was attributed to the their different mechanical and chemical stabilization potential. The TEM micrographs showed that the α precipitates hindered the growth of SIM needles, while the athermal αⳠmartensite was easily cut through by SIM. According to the EDS analysis, despite the presence of athermal αⳠmartensite, the segregation of β stabilizing elements from α precipitate to the β phase was traced; this was introduced as the second factor in spoiling the superelastic behavior of the β phase.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 703, 4 August 2017, Pages 513-520
Journal: Materials Science and Engineering: A - Volume 703, 4 August 2017, Pages 513-520
نویسندگان
M.A. Kalaie, A. Zarei-Hanzaki, M. Ghambari, P. Dastur, J. Málek, E. Farghadany,