کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
12055115 | 1001679 | 2019 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure and strength of a novel heat-resistant aluminum alloy strengthened by T-Al6Mg11Zn11 phase at elevated temperatures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We designed an aluminum (Al)-based alloy with the α-Al (fcc) matrix strengthened by the T-Al6Mg11Zn11 (cubic) intermetallic phase using a large two-phase region of α and T phases in the Al-Mg-Zn ternary system. Thermodynamic analysis assessed a composition of Al-5Mg-3.5Zn (at%) with the α-Al phase reinforced with high fractions (approximately 10%) of T phase. We observed that the T phase preferentially precipitated at grain boundaries in the α-Al matrix, increasing the area fraction of the T phase at grain boundaries during aging. The granular precipitates of the T phase were dispersed rather homogenously in the α-Al matrix with a particular orientation relationship of (1â11)α // (1â21)T and [011]α // [111]T at temperatures above 300â¯Â°C. After aging at 200â¯Â°C, numerous fine precipitates with a mean size of ~20â¯nm in the grain interior were observed, which were likely the metastable phase associated with the T phase. The present alloy (pre-aged at 200â¯Â°C for 1â¯h) exhibited a high yield strength of approximately 260â¯MPa at 200â¯Â°C, much higher than those of the conventional Al alloys at elevated temperatures corresponding to service temperatures for compressor impellers in turbochargers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 739, 2 January 2019, Pages 62-70
Journal: Materials Science and Engineering: A - Volume 739, 2 January 2019, Pages 62-70
نویسندگان
Naoki Takata, Masato Ishihara, Asuka Suzuki, Makoto Kobashi,