کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7976537 | 1514694 | 2016 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure, mechanical and shape memory properties of polycrystalline Ni-Mn-Ga High temperature shape memory alloys
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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: Microstructure, mechanical and shape memory properties of polycrystalline Ni-Mn-Ga High temperature shape memory alloys Microstructure, mechanical and shape memory properties of polycrystalline Ni-Mn-Ga High temperature shape memory alloys](/preview/png/7976537.png)
چکیده انگلیسی
Microstructure, martensitic transformation behavior, mechanical and shape memory properties of Ni57+xMn25Ga18âx (x=0, 0.5, 1, 1.5, 2, 3) high-temperature shape memory alloys were investigated. A single martensite phase with tetragonal structure is present for x=0, and dual phases composed of tetragonal martensite and face-centered cubic γ phase are observed for xâ¥0.5. The martensite variants are all twinned and well self-accommodated. The volume fraction of γ phase increases from 4.2% to 35.1% with increasing Ni content. Martensitic transformation temperature (Ms) increases from 437 °C for x=0 to 469 °C for x=0.5 and then remains almost unchangeable for xâ¥1. Ductile γ phase dispersed on the grain boundaries and martensite can apparently raise the strength and plasticity. However, the maximum shape memory strain decreases from 4.7% for x=0 to 1.0% for x=3, which means γ phase reduces the shape memory properties. The hampering effect of the γ phase particles on shape recovery of the alloys where xâ¥1.5 is more remarkable than on the alloys (x=0.5 and x=1) due to the larger γ phase fraction and the unfavorable γ phase distribution.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 649, 1 January 2016, Pages 254-262
Journal: Materials Science and Engineering: A - Volume 649, 1 January 2016, Pages 254-262
نویسندگان
Yan Xin, Yan Li,