کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7999065 | 1516261 | 2015 | 41 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of heat treatments on the microhardness and tensile strength of Al-0.25Â wt.% Zr alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In the present work, the effect of heat treatments on the microhardness and tensile properties of the Al-0.25 Zr (wt.%) alloy have been investigated. The Al-0.25 Zr (wt.%) alloy was melted in a vacuum furnace, and the molten alloy was poured into crucibles held in a hot filing furnace. Then, the samples were directionally solidified from bottom to top and aged isothermally and isochronally in a muffle furnace. Aging was performed in two ways: using a wide range of temperatures (350-600 °C) with a constant aging time (100 h) and a wide range of aging times (3-240 h) with a constant temperature (400 °C). The dependence of the microhardness (HV) and ultimate tensile strength (ÏUTS) on the aging temperatures and aging times was determined. According to the experimental results, the HV and ÏUTS values of the aged samples increase at a certain aging temperature and aging time values, reaching peak values at specific temperatures and aging times. The microhardness and ultimate tensile strength decreased with further increase of aging temperatures and aging times. The microscopic fracture surfaces of the aged samples under different aging conditions were observed using scanning electron microscopy. Fractographic analysis of the tensile fracture surfaces shows that the type of fracture changed significantly from ductile to brittle depending on the aging times. Transmission electron microscopy was also used to characterize the precipitation processes in an Al-0.25 Zr (wt.%) alloy aged at 400 °C for 120 h.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 632, 25 May 2015, Pages 229-237
Journal: Journal of Alloys and Compounds - Volume 632, 25 May 2015, Pages 229-237
نویسندگان
Emin Ãadırlı, Hicran Tecer, Mevlüt Åahin, Elif Yılmaz, Talip Kırındı, Mehmet Gündüz,