Mechanical properties of microconstituents in Nb-Si-Ti alloy by micropillar compression and nanoindentation

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:687

Article

Guo, Enyu¹  Singh, Sudhanshu S.^1,5  Kaira, Chandrashekara S.¹  Meng, Xianyu²  Xu, Yanjin⁴  Luo, Liangshun²  Wang, Mingyue³  Chawla, Nikhilesh¹ 

[1] Arizona State Univ, Mat Sci & Engn, Tempe, AZ 85287 USA

[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China

[3] Beihang Univ, Int Res Inst Multidisciplinary Sci, Beijing 100191, Peoples R China

[4] AVIC Beijing Aeronaut Mfg Technol Res Inst, Beijing 100024, Peoples R China

[5] Indian Inst Technol, Dept Mat Sci & Engn, Kanpur 208016, Uttar Pradesh, India

关键词: Intermetallics;    Mechanical properties;    High temperature alloy;    Fracture toughness;    Micropillar compression;   

DOI  :  10.1016/j.msea.2017.01.058

来源: Elsevier

【 摘 要 】

The micromechanical properties of both Nb solid solution (Nbss) and (Nb,Ti)3Si silicide in a ternary Nb-16Si22Ti (in at%) alloy were evaluated by nanoindentation and micropillar compression techniques. Nanoindentation tests showed that (Nb,Ti)3Si possesses much higher hardness (15.6 0.6 GPa) and Young's modulus (253.3 8.4 GPa) than Nbss (5.2 0.4 GPa and 124.9 5.1 GPa, respectively). Stress-strain curves of each constituent were obtained by micropillar compression. The stress-strain behavior showed that (Nb,Ti)3Si exhibited a brittle fracture mode, while Nbss was able to bear large ductile deformation. The compressive failure strength of (Nb,Ti)3Si intermetallic and yield strength of Nbss were found to be 8.4 1.2 GPa and 0.9 0.1 GPa, respectively. The fracture toughness of the (Nb,Ti)3Si phase evaluated by cracks emanating from nanoindentation, was measured to be similar to 2.3 MPa-m(1/2).

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