Development of a Cast Al-Mg2Si-Si In Situ Composite: Microstructure, Heat Treatment, and Mechanical Properties

被引：58

作者：

Georgatis, E. ^{[1
]}

Lekatou, A. ^{[1
]}

Karantzalis, A. E. ^{[1
]}

Petropoulos, H. ^{[1
]}

Katsamakis, S. ^{[1
]}

Poulia, A. ^{[1
]}

机构：

[1] Univ Ioannina, Dept Mat Sci & Engn, GR-45110 Ioannina, Greece

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2013年 / 22卷 / 03期

关键词：

aging; heat extraction bed; hypereutectic Al-Mg2Si; in situ composite; investment casting; solution treatment; ELECTRON-MICROSCOPE; EUTECTIC SILICON; NUCLEATING ROLE; PRIMARY MG2SI; SOLIDIFICATION; INTERMETALLICS; STRONTIUM; ALUMINUM; PHASE; PRECIPITATION;

D O I：

10.1007/s11665-012-0337-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An Al-11Mg(2)Si-Si in situ composite was prepared by a modified investment casting technique that employs sub-pressure for castability improvement and immersion of ceramic shell molds in fluidized beds of silica sand and iron particles for heat extraction improvement. The microstructure of the as-cast composite is explained according to the pseudoeutectic Al-Mg2Si phase diagram. The positive effect of a decreased number of mold investment layers and cooling assisted by immersion of the mold in a metallic bed on the tensile strength and hardness of the heat treated composite is noted. A minor presence of Fe in the master alloys constitutes an essential factor for the brittleness of the composite. Solution treatment notably improves the tensile strength of the composite; however, prolonged treatment deteriorates its ductility. The effect of time and temperature of the aging treatment on the hardness of the composite is investigated. The positive influence of cooling assisted by a metallic fluidized bed on the effectiveness of the aging treatment is noticed.

引用

页码：729 / 741

页数：13

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