کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7973217 | 1514625 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of Cu/Mg ratio on the microstructure, mechanical and corrosion properties of Al-Li-Cu-Mg-X alloys
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The effects of the Cu/Mg ratio on the microstructure, properties and fracture morphology of Al-Li-Cu-Mg-X (X = Mn, Zr, Zn) alloys were investigated. The results showed that the modification of the alloy composition with different Cu/Mg ratios significantly corresponds to various microstructures, which affects the corrosion resistance, hardness and tensile properties. For instance, when the Cu/Mg ratio varies from 0.83 to 4.33, the ultimate tensile strength of the Al-Cu-Li-Mg-X alloys gradually increases from 267.2 to 366.6â¯MPa. Corrosion tests revealed that increasing the Cu/Mg ratio markedly enhances the corrosion resistance of the alloy. The constitution and morphology of the precipitates are also found to vary with the Cu/Mg ratio. The main precipitates are δ'(Al3Li) and the minor TB(Al7Cu4Li) phase when the Cu/Mg ratios are 1 and 0.83. By increasing the Cu/Mg ratio to 2.35, the θ'(Al2Cu) phase can be detected, while only the T1(Al2CuLi) phase is detected in the alloy with the highest Cu/Mg ratio. The combinative hardening of the T1, TB, θ' and δ' precipitates is responsible for the improvement in the mechanical properties and corrosion resistance of the alloy with the highest Cu/Mg ratio. During the tensile testing, the failure mode is converted from a typical shallow dimple fracture to an intergranular-dominated mixed one with the decrease of the Cu/Mg ratio.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 718, 7 March 2018, Pages 241-249
Journal: Materials Science and Engineering: A - Volume 718, 7 March 2018, Pages 241-249
نویسندگان
Aboubakr Medjahed, Abdelkhalek Henniche, Mehdi Derradji, Tianfu Yu, Yang Wang, Ruizhi Wu, Legan Hou, Jinghuai Zhang, Xinlin Li, Milin Zhang,