کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1574586 | 1514723 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigation on high temperature short-term creep and stress relaxation of titanium alloy
ترجمه فارسی عنوان
بررسی درجه حرارت پایین خزش و تنش آلیاژ تیتانیوم در دمای بالا
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کلمات کلیدی
آلیاژ تیتانیوم، خزش آرامش استرس، بهبود، نفوذ،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
In this paper, the short-term creep and stress relaxation tests were performed on Ti-6Al-4V alloy at temperatures of 650-800 °C. Creep time of 60 min and stress relaxation time of 30 min were adopted, respectively. The obtained stress exponent of 1.62 from stress relaxation test falls within exponent range of 1.6-1.69 from creep tests at 700 °C while stress exponent of 1.82 obtained from stress relaxation is in the exponent range of 1.52-1.97 from creep tests at 750 °C. The thermal activation energy of 238.13 kJ is obtained from creep tests under initial stress of 45 MPa. The microstructures of the tested specimens were investigated by transmission electron microscope and electron back-scattered diffraction to study and compare the mechanisms of creep and stress relaxation. Microstructure analysis shows that the creep and stress relaxation behaviors are both governed by vacancy diffusion at 650 °C. Above 650 °C, the two behaviors are mainly controlled by dislocation climb. Nevertheless, the dislocations are generated from different sources for creep and stress relaxation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 620, 3 January 2015, Pages 172-180
Journal: Materials Science and Engineering: A - Volume 620, 3 January 2015, Pages 172-180
نویسندگان
Yingying Zong, Po Liu, Bin Guo, Debin Shan,