کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
5454738 1514359 2017 18 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله ISI
Characterization of the solidification path and microstructure of secondary Al-7Si-3Cu-0.3Mg alloy with Zr, V and Ni additions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Characterization of the solidification path and microstructure of secondary Al-7Si-3Cu-0.3Mg alloy with Zr, V and Ni additions
چکیده انگلیسی
The effect of individual and combined Zr, V and Ni additions on solidification path and microstructural evolution of secondary Al-7Si-3Cu-0.3Mg alloy were investigated using microscopy and thermal analysis techniques. The results show how the Zr addition caused remarkable grain refinement due to the precipitation of primary pro-peritectic Al3Zr particles that lead to a peritectic reaction to yield α-Al during solidification; however, the peritectic transformation was incomplete due to a limited solid-state diffusion. Moreover, with Zr addition, few numbers of flaky (AlSi)3(ZrTi) compounds appeared in the microstructure. Vanadium addition showed also grain refinement level similar to that of Zr-added alloy. However, the role of V cannot be explained by the precipitation of primary pro-peritectic particles that would provide potent nucleation sites; instead, vanadium addition substantially increases the degree of constitutional undercooling, thus activating certain particles to more easily nucleate α-Al. Excess vanadium were mainly bound to pro-eutectic and polyhedral-shaped (AlSi)2(VMnTi) compounds. Combined Zr and V addition exerted better grain refinement level than the individual Zr or V addition; this occurred due to both increased the population of Al3Zr phase particles as a result of its enrichment with V, and enhanced the degree of constitutional undercooling. Nickel addition exerted no apparent influence on the formation of both α-Al and eutectic Si; however, significant changes occurred in the sequence of post-eutectic reactions: the script-like Al6Cu3Ni and flaky-like Al9(FeCu)Ni phases formed in addition to the Al2Cu and Al5Si6Cu2Mg8 particles; this led to a substantial reduction in the alloy's freezing range. The findings of this study can benefit and contribute to developing a new Al-Si based foundry alloys intended for high-temperature applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 128, June 2017, Pages 100-108
نویسندگان
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