Enhanced tensile strength and fracture toughness of a Ti-TiAl metal-intermetallic laminate (MIL) composite

被引：21
作者：
Sun, Wei [1 ,2 ]
You, Fenghai [3 ]
Kong, Fantao [1 ,2 ]
Wang, Xiaopeng [2 ]
Chen, Yuyong [1 ,2 ]
机构：
[1] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[3] Beijing Hangxing Machinery Mfg Co Ltd, Beijing 100013, Peoples R China
来源：
INTERMETALLICS | 2020年 / 118卷
基金：
中国国家自然科学基金;
关键词：
TiAl alloy; Laminate composite; Hot-pack rolling; Microstructure; High temperature properties; Fracture toughness; MECHANICAL-PROPERTIES; MICROSTRUCTURE EVOLUTION; DEFORMATION-BEHAVIOR; PHASE-TRANSFORMATION; BETA-PHASE; HIGH NB; ALLOY; SHEET; TITANIUM; FOILS;
D O I：
10.1016/j.intermet.2019.106684
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：
High temperature titanium alloy/Ti-43Al-9V metal-intermetallic laminate composite was successfully fabricated by hot-pack rolling. The titanium alloy exhibits a lamellar structure and the TiAl alloy consists of B2 phase and elongated gamma phase. Due to the low rolling and annealing temperature, the TiAl alloy shows a low extent of dynamic recrystallization (69.3%) and a high dislocations density (17%). The composite shows an excellent combination of the enhanced tensile strength and fracture toughness. The tensile strength of composite at 25 degrees C and 700 degrees C are 845 MPa and 730 MPa respectively. The fracture toughness of composite are 29.4 MPa.m(1/2) and 26.6 MPa.m(1/2) in arrester orientation and divider orientation respectively, which are much higher than monolithic Ti-43Al-9V alloy. The strengthening of composite is mainly attributed to high density dislocations and sub -structures stored in composite and the toughening mechanisms of composite are crack deflection, secondary cracks and crack tip convolution.
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页数：8
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