RELATIONSHIP BETWEEN MECHANICAL PROPERTIES AND LAMELLAR ORIENTATION OF PST CRYSTALS IN Ti－45Al－8Nb ALLOY

doi:10.3724/SP.J.1037.2013.00535

Acta Metall Sin

2013, Vol. 49

Issue (11): 1457-1461 DOI: 10.3724/SP.J.1037.2013.00535

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RELATIONSHIP BETWEEN MECHANICAL PROPERTIES AND LAMELLAR ORIENTATION OF PST CRYSTALS IN Ti－45Al－8Nb ALLOY

PENG Yingbo, CHEN Feng, WANG Minzhi, SU Xiang, CHEN Guang

Engineering Research Center of Materials Behavior and Design, Ministry of Education,Nanjing University of Science and Technology, Nanjing 210094

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PENG Yingbo, CHEN Feng, WANG Minzhi, SU Xiang, CHEN Guang. RELATIONSHIP BETWEEN MECHANICAL PROPERTIES AND LAMELLAR ORIENTATION OF PST CRYSTALS IN Ti－45Al－8Nb ALLOY. Acta Metall Sin, 2013, 49(11): 1457-1461.

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Abstract

Room temperature compression performance of polysynthetic twinned crystal (PST crystal) in Ti－45Al－8Nb (atomic fraction, %) alloys with different angles between lamellar orientation and uniaxial stress direction was studied. The causes of the fracture failure were investigated by the fracture surface and the effects of the Nb element on strengthening were also studied. It was found that when the lamellar orientation in the PST crystal was paralleled or vertical to the stress direction, shear deformation was vertical to lamellar interface, and when the angle of lamellar orientation to the stress direction was 45°, the shear deformation was paralleled to lamellar interface. The yield strength of the 0° PST crystal was the maximum which was up to 1296 MPa. The PST crystal of 45° had the best compression plastic strain of approximately 1.1%, but its yield strength was the minimum of only 847 MPa. Nb element could refine lamellar structure and improve the room temperature yield strength significantly through increasing shear stress of dislocation motion and reducing the stacking fault energy.

Key words: TiAl intermetallics polysynthetic twinned crystal (PST crystal) lamellar orientation mechanical property

Received: 02 September 2013

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	PENG Yingbo
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	WANG Minzhi
	SU Xiang
	CHEN Guang

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00535 OR https://www.ams.org.cn/EN/Y2013/V49/I11/1457

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