Industrially fabricated in-situ Al-AlN metal matrix composites (part B): The mechanical, creep, and thermal properties

被引:21
|
作者
Balog, Martin [1 ,2 ]
Krizik, Peter [1 ]
Dvorak, Jiri [3 ]
Bajana, Oto [1 ]
Krajcovic, Jozef [4 ]
Drienovsky, Marian [4 ]
机构
[1] Slovak Acad Sci, Inst Mat & Machine Mech, Dubravska Cesta 9, Bratislava 84513, Slovakia
[2] Slovak Acad Sci, Ctr Excellence Adv Mat Applicat, Dubravska Cesta 9, Bratislava 84511, Slovakia
[3] ASCR, CEITEC IPM, Inst Phys Mat, Zizkova 22, Brno 61662, Czech Republic
[4] Slovak Univ Technol Bratislava, Fac Mat Sci & Technol Trnava, Inst Mat Sci, Paulinska 16, Trnava 91724, Slovakia
关键词
Aluminum (Al); Aluminum nitride (AlN); Extrusion; In-situ; Metal matrix composites (MMC); Powder metallurgy (PM); HIGH-TEMPERATURE DEFORMATION; ALUMINUM NITRIDE; REINFORCED ALUMINUM; GRAIN-BOUNDARIES; STRENGTH; BEHAVIOR; POWDERS; MICROSTRUCTURE; CONSOLIDATION; CONDUCTIVITY;
D O I
10.1016/j.jallcom.2022.164720
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The present study (part B) is a direct continuation of the leading study (part A), in which we had introduced extruded aluminum (Al) + 8.8 and 14.7 vol% aluminum nitride (AlN) metal matrix composites (MMC) manufactured at a cost-effective industrial scale and targeted for structural load-bearing applications with an expected service at elevated temperatures. In the leading study the processing, microstructure of nitrided and extruded Al-AlN MMC and the thermal stability of the extruded Al-AlN MMC as reflected in changes to their tensile mechanical properties induced by annealing up to 600 degrees C were elaborated. In the present ensuing study we discussed in details the mechanical, thermal and creep properties, active strengthening mechanisms, and microstructure-property relations of Al-AlN MMC annealed at 500 degrees C for 24 h, which were examined in a broad temperature range of 22-500 degrees C. In addition to increased Young's modulus Al-AlN MMC showed high tensile strengths determined at 300 degrees C, which were superior to any conventional Al alloy, accompanied with reasonably high ductility. At the same time Al-AlN MMC preserved excellent creep performance, which was superior to the heat resistant reference alloys, reduced coefficient of thermal expansion and reasonable thermal conductivity. The results confirmed that reported thermally stable Al-AlN MMC may be considered a promising material with an appealing set of the properties directed for load-bearing structural applications with an expected service at elevated temperatures. (C) 2022 Elsevier B.V. All rights reserved.
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页数:11
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