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Indexed by:期刊论文

Date of Publication:2016-02-01

Journal:INTERNATIONAL JOURNAL OF MATERIALS RESEARCH

Included Journals:SCIE、EI、Scopus

Volume:107

Issue:2

Page Number:168-176

ISSN No.:1862-5282

Key Words:Al-Ti-C master alloy; Grain refinement; Self-propagating high-temperature synthesis; Macrostructure; EDS linear scanning

Abstract:Al-5Ti-0.2C master alloy was prepared via a simple combustion synthesis approach. By means of different smelting parameters, changes in its microstructure and refining performance were studied. Under short holding conditions (5 - 10 min) increase of Al content in the preform from 10 % to 40 % results in more numerous carbon-rich particles in the master alloy and better refinement performance. Nevertheless, preparation of refiner with satisfactory refining ability requires longer holding conditions (30 min). With prolonged holding time after the combustion, alloys possess similar microstructure and refining efficacy regardless of the chemical composition of the preform. Decrease of smelting temperature from 1 250 degrees C to 950 degrees C results in noticeable deterioration of the master alloy refining performance. The reasons, which impede successful utilization of primary benefits provided by combustion reaction, are discussed.