Characterization of curve ribbon boride with blocks in a Ti-45Al-2Nb-2Mn-1B alloy

被引：4

作者：

Zhang, Min ^{[1
]}

Yan, Yingwei ^{[1
]}

Liu, Renci ^{[2
]}

Gao, Yulin ^{[1
]}

Sun, Yanhua ^{[1
]}

Tan, Zhunli ^{[1
]}

机构：

[1] Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Mat Sci & Engn Res Ctr, Beijing 100044, Peoples R China

[2] Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China

来源：

INTERMETALLICS | 2021年 / 138卷

关键词：

TiAl; Casting; Microstructure; Segregation; Electron microscopy; Transmission; TEMPERATURE TENSILE PROPERTIES; GRAIN-REFINEMENT; BORON ADDITION; GAMMA; MICROSTRUCTURE; CARBIDE; NB;

D O I：

10.1016/j.intermet.2021.107318

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：

Borides are very important in cast TiAl alloys. Among various morphologies and structures, the long curve ribbon borides are harmful to mechanical properties and need to be avoided or refined. The knowledge on curve ribbon is relatively less than fine boride particles. In the present work, a long ribbon with blocky borides at both ends is studied by SEM, HRTEM , and STEM-EDS method. The ribbon consists of nanoflakes of 4 boride structures and a B2 layer. The blocky boride is Ti3B4 with a D7(b) structure. The ribbon contains flakes with the structures of D7(b), B27, B-f, C32, and B2. The block is adhesive to the ribbon by a B2 layer with a width of several nanometers. Mn is found to segregate to B2/borides interfaces inside the ribbon. Nb is rich in borides but poor in the B2 phase.

引用

页数：6

共 38 条

[1]

Appel F, 2011, GAMMA TITANIUM ALUMINIDE ALLOYS: SCIENCE AND TECHNOLOGY, P1, DOI 10.1002/9783527636204

[2]

Bewlay B.P., 2013, INTERMETALLIC BASED

[3]

Bewlay B.P., 2013, SCI TECHNOLOGY IMPLE

[4] EFFECT OF TIB2 ADDITIONS ON THE COLONY SIZE OF NEAR GAMMA TITANIUM ALUMINIDES [J].

BRYANT, JD ;

CHRISTODOULOU, L ;

MAISANO, JR .

SCRIPTA METALLURGICA ET MATERIALIA, 1990, 24 (01) :33-38

[5] Diffraction artefacts from twins and stacking faults, and the mirage of hexagonal, polytypes or other superstructures [J].

Cayron, Cyril .

SCRIPTA MATERIALIA, 2021, 194

[6]

Chen G.L., 1993, STRUCTURAL INTERMETA

[7] Investigation on the 1000, 1150 and 1400 degrees C isothermal section of the Ti-Al-Nb system [J].

Chen, GL ;

Wang, XT ;

Ni, KQ ;

Hao, SM ;

Cao, JX ;

Zhang, X .

INTERMETALLICS, 1996, 4 (01) :13-22

[8] CARBIDE PRECIPITATION IN GAMMA-TIAL ALLOYS [J].

CHEN, S ;

BEAVEN, PA ;

WAGNER, R .

SCRIPTA METALLURGICA ET MATERIALIA, 1992, 26 (08) :1205-1210

[9] The mechanism of grain refinement in TiAl alloys by boron addition - an alternative hypothesis [J].

Cheng, TT .

INTERMETALLICS, 2000, 8 (01) :29-37

[10] Effects of niobium on phase composition and improving mechanical properties in TiAl alloy reinforced by Ti2AlC [J].

Fang, Hongze ;

Chen, Ruirun ;

Liu, Yangli ;

Tan, Yingmei ;

Su, Yanqing ;

Ding, Hongsheng ;

Guo, Jingjie .

INTERMETALLICS, 2019, 115

← 1 2 3 4 →