Microstructure and elevated-temperature mechanical properties of in situ Ti2AlNb-reinforced TiAl-matrix composite prepared by powder metallurgy

被引：11

作者：

Liang, Xiaopeng ^{[1
,2
,3
]}

Liu, Zhenqi ^{[1
]}

Li, Huizhong ^{[1
,2
,3
]}

Chen, Feihu ^{[1
]}

Yang, Wenfeng ^{[1
]}

Ouyang, Sihui ^{[2
]}

Liu, Yong ^{[2
]}

Wang, Li ^{[2
,4
]}

机构：

[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China

[2] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

[3] Cent South Univ, Key Lab Nonferrous Met Mat Sci & Engn, Minist Educ, Changsha 410083, Peoples R China

[4] Helmholtz Zentrum Geesthacht, Inst Mat Res, Max Planck Str 1, D-21502 Geesthacht, Germany

来源：

MATERIALS TODAY COMMUNICATIONS | 2020年 / 24卷 / 24期

基金：

中国国家自然科学基金; 国家杰出青年科学基金;

关键词：

TiAl intermetallic composite; In situ formation; Ti2AlNb phase; Elevated-temperature mechanical properties; Microstructure; Strength-ductility product; FRACTURE-TOUGHNESS; HIGH NB; PRECIPITATE SHAPE; BORON ADDITION; HIGH-STRENGTH; BEHAVIOR; ALLOY; EVOLUTION; PHASE; ORIENTATION;

D O I：

10.1016/j.mtcomm.2020.101179

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An in situ Ti2AlNb-reinforced Ti-45Al-5Nb-0.3 W-based intermetallic composite was prepared using 2 vol. % Nb powder and TiAl pre-alloy powder. The microstructure evolution and elevated-temperature mechanical properties of the Ti2AlNb/TiAl composite were investigated. The results show that during the hot isostatic pressing (HIP) process, Nb diffused into the TiAl matrix, and formed Nb-rich particles in which an Nb-rich-region and the coarse rod-like Ti2AlNb phase existed. After hot extrusion, the Nb-rich particles elongated along the direction of extrusion. Further, the mean diameter of the Ti2AlNb phase regions decreased, and the Ti2AlNb content increased. After heat treatment at 1280 degrees C for 1 h, the rod-like Ti2AlNb phase regions in the extruded specimen transformed into needle-like and fine lath-like structures, and the proportion of Ti2AlNb in the Nb-rich-regions increased. The extruded Ti2AlNb/TiAl specimen shows a high tensile elongation (TE), and the heat-treated specimen shows a high yield strength (YS) and ultimate tensile strength (UTS) at the test temperatures of 750 degrees C-900 degrees C. In particular, the extruded specimen shows excellent strength-ductility product (UTS x TE) values of 38.8 GPa% and 46.9 GPa% at 800 degrees C and 850 degrees C, respectively. The high toughness of TiAl intermetallic composites was because of the fibrous tough Nb-rich-regions that contained the fine Ti2AlNb phase.

引用

页数：9

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