کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1602090 1515894 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of growth rate on microstructure and mechanical properties of directionally solidified multiphase intermetallic Ni-Al-Cr-Ta-Mo-Zr alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Effect of growth rate on microstructure and mechanical properties of directionally solidified multiphase intermetallic Ni-Al-Cr-Ta-Mo-Zr alloy
چکیده انگلیسی
The effect of growth rate on microstructure and mechanical properties of directionally solidified (DS) multiphase intermetallic alloy with the chemical composition Ni-21.9Al-8.1Cr-4.2Ta-0.9Mo-0.3Zr (at.%) was studied. The DS ingots were prepared at constant growth rates V ranging from 5.56 × 10−6 to 1.18 × 10−4 ms−1 and at a constant temperature gradient at the solid-liquid interface of GL = 12 × 103 K m−1. Increasing growth rate increases volume fraction of dendrites and decreases primary dendritic arm spacing, mean diameter of α-Cr (Cr-based solid solution) and γ′(Ni3Al) precipitates within the dendrites. Room-temperature compressive yield strength, ultimate compressive strength, hardness and microhardness of dendrites increase with increasing growth rate. All room-temperature tensile specimens show brittle fracture without yielding. The brittle-to-ductile transition temperature for tensile specimens is determined to be about 1148 K. Minimum creep rate is found to depend strongly on the applied stress and temperature according to the power law with a stress exponent of n = 7 and apparent activation energy for creep of Qa = 401 kJ/mol.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 14, Issues 10–11, October–November 2006, Pages 1339-1344
نویسندگان
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