MICROSTRUCTURES AND MECHANICAL PROPERTIES OF TiAl/Ti3Al MULTI-LAYERED COMPOSITE

doi:10.11900/0412.1961.2016.00091

Acta Metall Sin

2016, Vol. 52

Issue (12): 1579-1585 DOI: 10.11900/0412.1961.2016.00091

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MICROSTRUCTURES AND MECHANICAL PROPERTIES OF TiAl/Ti₃Al MULTI-LAYERED COMPOSITE

Zaoyu SHEN,Limin HE(

),Guanghong HUANG,Rende MU,Jinwang GU,Weizhong LIU

Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China

Cite this article:

Zaoyu SHEN,Limin HE,Guanghong HUANG,Rende MU,Jinwang GU,Weizhong LIU. MICROSTRUCTURES AND MECHANICAL PROPERTIES OF TiAl/Ti₃Al MULTI-LAYERED COMPOSITE. Acta Metall Sin, 2016, 52(12): 1579-1585.

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Abstract

In recent years, intermetallic compounds have received a lot of considerable attentions for high temperature applications in modern aircraft manufacturers, high temperature engine components, shape memory devices and power generation industry. Among these materials, Ti-Al intermetallic compounds are fascinating materials owing to their low density, high stiffness and good creep properties. However, the structure of the metallic bonding in these intermetallics is the important reason for their insufficient ductility at room temperature. In this work, large-sized TiAl/Ti₃Al multi-layered composite thin sheet with uniform chemical composition was prepared by electron beam physical vapor deposition (EB-PVD) technology. The composite and microstructure of multi-layered composite were analyzed by XRD and SEM. The results indicated that the prepared material with visible lamellar structure was composed of α₂-Ti₃Al and γ-TiAl phases. The densification process of composite was carried out by hot isostatic pressing. The multi-layered material was evaluated with static tensile test before and after hot isostatic pressing. The multi-layered composite after hot isostatic pressing had a higher tensile strength and a good characteristic of tensile elongation. Based on the tensile fracture morphology, the microscopic deformation mechanisms and fracture mechanism were investigated. After hot isostatic pressing, the fracture mechanism transforms to a mixed mode which consists of intergranular fracture and cleavage fracture.

Key words: electron beam physical vapor deposition (EB-PVD), microlaminate, microstructure, mechanical property, fracture mechanism

Received: 17 March 2016

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	Zaoyu SHEN
	Limin HE
	Guanghong HUANG
	Rende MU
	Jinwang GU
	Weizhong LIU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2016.00091 OR https://www.ams.org.cn/EN/Y2016/V52/I12/1579

Fig.1 XRD spectrum of the TiAl/Ti₃Al micolaminated composites

Fig.2 SEM images of surface (a) and cross-section (b) of TiAl/Ti₃Al microlaminated composites, and cross-section after hot isostatic pressing (c) (Inset in Fig.2b show the enlarged view)

Fig.3 Cross-section SEM image (a) and corresponding EDS analysis (b) of TiAl/Ti₃Al microlaminated sheet

Fig.4 Low (a, c) and high (b, d) magnified fracture SEM images of TiAl/Ti₃Al microlaminates at room temperature before (a, b) and after (c, d) hot isostatic pressing

Fig.5 Low (a) and high (b~d) magnified fracture SEM images of TiAl/Ti₃Al microlaminates at 825 ℃ after hot isostatic pressing

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