Direct Thermal Method of Aluminium 7075

被引：8

作者：

Ahmad, A. H. ^{[1
,2
,3
]}

Naher, S. ^{[4
]}

Brabazon, D. ^{[1
,2
]}

机构：

[1] Dublin City Univ, Sch Mech & Mfg Engn, Dublin 9, Ireland

[2] Dublin City Univ, Adv Proc Technol Res Ctr, Dublin, Ireland

[3] Univ Malaysia Pahang, Fac Mech Engn, Pekan, Malaysia

[4] City Univ London, Sch Engn & Math Sci, London, England

来源：

ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES XVI | 2014年 / 939卷

关键词：

Aluminium; 7075; Direct Thermal Method; Semi-solid Metal; Pouring Temperature; Holding Time; Fraction Solid; COOLING RATE; MICROSTRUCTURE; BEHAVIOR; ALLOYS;

D O I：

10.4028/www.scientific.net/AMR.939.400

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The evolution of microstructure affect from different pouring temperatures and holding times using a direct thermal method is presented in this paper. The direct thermal method is one of the thermal techniques which are used to produce semi-solid metal feedstock. In this experimental work, aluminium 7075 alloy was used. The experiments were carried out by processing a sample with a 0.7 degrees C/s cooling rate to evaluate the formation of the microstructure. In direct thermal method experiment, a molten 7075 was poured into a cylindrical copper mould at different pouring temperatures of 680 degrees C and 660 degrees C meanwhile the holding time of 20 s, 40 s and 60 s before quenched into room temperature water. The sample processed by the cooling rate of 0.7 degrees C/s produced a large microstructure. The formation of a spheroidal microstructure was obtained with the combination of a suitable pouring temperature and holding time. The pouring temperature of 665 degrees C and the holding time of 60 s produced a finer and uniform microstructure that is suitable for semi-solid feedstock.

引用

页码：400 / +

页数：3

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