TY - JOUR
T1 - Effect of spark plasma sintering temperatures on microstructure and mechanical properties of in-situ (La2O3+TiB)/Ti2AlNb composites with a tailored three-dimensional network architecture
AU - Zhang, Ningbo
AU - Sun, Dongli
AU - Han, Xiuli
AU - Wang, Ze
AU - Liu, Hao
AU - Wang, Zhijun
AU - Yang, Wenshu
AU - Wu, Gaohui
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/1/20
Y1 - 2020/1/20
N2 - The influence of sintering temperatures on the microstructure and properties of network-strengthened (La2O3+TiB)/Ti2AlNb composites were investigated in this study. Microstructural characterization results showed that the reinforced phases comprised of B27-type TiB and La2O3 would in-situ form with transition phases disappearing. Also, the TiB held a fixed crystallographic orientation relationship with α2-Ti3Al phase. The excess precipitation of α2, voids and the agglomeration of reinforced phases in prior particle boundaries (PPBs) area were faded away with the sintering temperature increasing. Tensile test results demonstrated the composite sintered at 1250 °C exhibited a superior tensile strength of 1095 and 853 MPa at 25 and 650 °C, respectively. Pores, the agglomeration of the reinforced phases and massive α2 in PPBs area would promote premature rupture and cause a low tensile strength. When the premature failure was avoided, a high TiB aspect ratio was favorable to strengthening.
AB - The influence of sintering temperatures on the microstructure and properties of network-strengthened (La2O3+TiB)/Ti2AlNb composites were investigated in this study. Microstructural characterization results showed that the reinforced phases comprised of B27-type TiB and La2O3 would in-situ form with transition phases disappearing. Also, the TiB held a fixed crystallographic orientation relationship with α2-Ti3Al phase. The excess precipitation of α2, voids and the agglomeration of reinforced phases in prior particle boundaries (PPBs) area were faded away with the sintering temperature increasing. Tensile test results demonstrated the composite sintered at 1250 °C exhibited a superior tensile strength of 1095 and 853 MPa at 25 and 650 °C, respectively. Pores, the agglomeration of the reinforced phases and massive α2 in PPBs area would promote premature rupture and cause a low tensile strength. When the premature failure was avoided, a high TiB aspect ratio was favorable to strengthening.
KW - Interface
KW - Mechanical properties
KW - Metal-matrix composites
KW - Microstructure evolution
KW - Spark plasma sintering
KW - TiAlNb
UR - https://www.scopus.com/pages/publications/85076052220
U2 - 10.1016/j.msea.2019.138769
DO - 10.1016/j.msea.2019.138769
M3 - 文章
AN - SCOPUS:85076052220
SN - 0921-5093
VL - 772
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
M1 - 138769
ER -