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

被引：9

作者：

Peng Yingbo ^{[1
]}

Chen Fang ^{[1
]}

Wang Minzhi ^{[1
]}

Su Xiang ^{[1
]}

Chen Guang ^{[1
]}

机构：

[1] Nanjing Univ Sci & Technol, Minist Educ, Engn Res Ctr Mat Behav & Design, Nanjing 210094, Jiangsu, Peoples R China

来源：

ACTA METALLURGICA SINICA | 2013年 / 49卷 / 11期

关键词：

TiAl intermetallics; polysynthetic twinned crystal (PST crystal); lamellar orientation; mechanical property; TIAL-BASED ALLOY; HIGH-NB; DEFORMATION; BEHAVIOR; CREEP; TEMPERATURE; PLATES;

D O I：

10.3724/SP.J.1037.2013.00535

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

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 degrees, the shear deformation was paralleled to lamellar interface. The yield strength of the 0 degrees PST crystal was the maximum which was up to 1296 MPa. The PST crystal of 45 degrees 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.

引用

页码：1457 / 1461

页数：5

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