Determination of dendrite coherency point characteristics in Al-Si-Mg alloy

IF 1.3 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

International Journal of Cast Metals Research Pub Date : 2020-12-23 DOI:10.1080/13640461.2020.1864928

M. Malekan, A. Bahmani

引用次数: 3

Abstract

ABSTRACT Dendrite coherency or dendrite impingement is an important factor for determining solidification microstructure and casting defects of alloys. In this research, the effect of various cooling rates and Al-5Ti-1B grain refiner contents on the dendrite coherency point (DCP) characteristics of an Al-Si-Mg alloy designated as A357 has been studied. The results showed that both mentioned parameters have a significant influence on DCP of this alloy. Increasing the cooling rate from 0.15 to 1.0 °C/s and the grain refiner content from 0.0 to 3 wt. % increased the solid fraction in where dendrite coherency occurs. Moreover, enhancement of the cooling rate and grain refiner could increase the difference between the liquidus and coherency temperatures (TN–TDCP), about 27 and 26 °C, respectively. The dendrite coherency time decreased by increasing the cooling rate and increased by increasing the grain refiner content.

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Al-Si-Mg合金枝晶相干点特性的测定

枝晶相干性或枝晶冲击是决定合金凝固组织和铸造缺陷的重要因素。本文研究了不同冷却速率和Al-5Ti-1B晶粒细化剂含量对A357铝硅镁合金枝晶相干性点（DCP）特性的影响。结果表明，这两个参数对该合金的DCP都有显著影响。将冷却速率从0.15°C/s增加到1.0°C/s，将晶粒细化剂含量从0.0 wt.%增加到3 wt.%，增加了发生枝晶相干性的固体分数。此外，提高冷却速率和晶粒细化剂可以增加液相线和相干性温度（TN–TDCP）之间的差异，分别约为27和26°C。枝晶相干性时间随冷却速率的增加而减少，随晶粒细化剂含量的增加而增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Cast Metals Research 工程技术-冶金工程

CiteScore

2.70

自引率

7.10%

发文量

审稿时长

7.5 months

期刊介绍： The International Journal of Cast Metals Research is devoted to the dissemination of peer reviewed information on the science and engineering of cast metals, solidification and casting processes. Assured production of high integrity castings requires an integrated approach that optimises casting, mould and gating design; mould materials and binders; alloy composition and microstructure; metal melting, modification and handling; dimensional control; and finishing and post-treatment of the casting. The Journal reports advances in both the fundamental science and materials and production engineering contributing to the successful manufacture of fit for purpose castings.