CHARACTERIZATION OF TRIBOLOGICAL AND MECHANICAL PROPERTIES OF AA7050/Al2 O3 COMPOSITES AT ELEVATED TEMPERATURE

被引：0

作者：

Ranjith R. ^{[1
]}

Kumar S.N.V. ^{[2
]}

Giridharan P.K. ^{[3
]}

Pradeep V.P. ^{[4
]}

机构：

[1] SNS College of Technology, Tamil Nadu, Coimbatore

[2] SNS Institutions, Tamil Nadu, Coimbatore

[3] Amrita School of Engineering, Amrita Vishwa Vidhyapeetham, Chennai

[4] Dr. N.G.P. Institute of Technology, Tamil Nadu, Coimbatore

来源：

Ranjith, Rajamanickam (ranjith.mecs@gmail.com) | 1600年 / Begell House Inc.卷 / 25期

关键词：

ANOVA; composites; elevated temperature; mechanical property; PROMTHEE; wear;

D O I：

10.1615/HighTempMatProc.2021040983

中图分类号：

学科分类号：

摘要：

In this research work, aerospace aluminum alloy AA7050 was reinforced through the stir casting route with Al2 O3 with an average particle size of 5 µm. Potassium titanium fluoride (K2 TiF6) was added as flux to improve the wettability of reinforcement and matrix material. AA7050/Al2 O3 composites of varying weight percentage (0, 2, 4, 6) were fabricated and machined to remove surface defects. Wear experiments were performed on composites by varying load, velocity, temperature, and weight percentage using a pin-on disc apparatus. The hardness and tensile tests were performed at elevated temperature. The results revealed that the addition of particles improves the wear resistance, owing to the formation of a mechanical mixed layer. The wear rate at 300°C was 100% percent higher than the wear rate at 150°C. The tensile strength and hardness of composites showed improvement, owing to the Orowan strengthening and Hall–Petch effects. The ANOVA table reveals that temperature was the most influential factor followed by the weight percentage of reinforcing particles. The parameters were optimized using the PROMTHEE approach. The results revealed that AA7050/4Al2 O3 at 150°C and AA7050/2Al2 O3 at 300°C possess better material properties. © 2021 by Begell House, Inc.

引用

页码：39 / 50

页数：11

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