Hierarchical modification of bimodal grain structure in Al/Ti laminated composites for extraordinary strength-ductility synergy

被引：4

作者：

Que, Biaohua ^{[1
]}

Chen, Liang ^{[1
,2
]}

Zhao, Yuhui ^{[1
]}

Qian, Lihua ^{[1
]}

Lin, Jun ^{[1
,2
]}

Zhang, Cunsheng ^{[1
,2
]}

Zhao, Guoqun ^{[1
,2
]}

机构：

[1] Shandong Univ, State Key Lab Adv Equipment & Technol Met Forming, Jinan 250061, Shandong, Peoples R China

[2] Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Shandong, Peoples R China

来源：

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2024年 / 187卷

基金：

中国国家自然科学基金;

关键词：

A; Laminates; B. Mechanical properties; B; Microstructures; E; Sintering; MECHANICAL-PROPERTIES; METAL; ALUMINUM; SIZE; ALLOY; PHASE; MICROSTRUCTURE; SEGREGATION; EVOLUTION; BEHAVIOR;

D O I：

10.1016/j.compositesa.2024.108438

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Al/Ti laminates with altering Al grain sizes was fabricated via hot press sintering. Fine Al powders results in low sintering density and obvious cracks at Al/Ti interface. Large Al powders greatly increased the grain size, grain aspect ratio, LAGBs fraction, and recrystallization fraction of the Al layers. The texture heterogeneity is also significant, with rolling texture in Ti layer and random texture in Al layer. Ti5Si3 phase precipitated at Al/Ti interface, and it gradually partitioned Ti atoms from TiAl3 and hindered the formation of TiAl3. Moreover, numerous stacking faults, dislocation loops, dislocation pinning, and dislocation tangles were observed at Al/Ti interface, resulting in an increased back stress. Large Al grains contributes the highest bending strength of 734.8 MPa, tensile strength of 753.2 MPa, and fracture strain of 71 %. The effect of grain size on work hardening was attributed to the fraction of LAGBs, dislocation storage capacity and additional HDI strengthening.

引用

页数：13

共 47 条

[1] Mechanical and microstructural characteristics of Ti6Al4V/AA2519 and Ti6Al4V/AA1050/AA2519 laminates manufactured by explosive welding [J].