Microstructure and mechanical properties of multi-phase TiAl alloy matrix composites consolidated via field-assisted sintering technique

被引：3

作者：

Rominiyi, Azeez Lawan ^{[1
]}

Mashinini, Peter Madindwa ^{[1
]}

Masina, Bathusile Nelisiwe ^{[2
]}

Shongwe, Mxolisi Brendon ^{[3
]}

机构：

[1] Univ Johannesburg, Dept Mech & Ind Engn, Doornfontein Campus, ZA-2028 Johannesburg, South Africa

[2] Council Sci & Ind Res CSIR, Natl Laser Ctr, 629 Meiring Naude Rd,Brummeria, Pretoria, South Africa

[3] Tshwane Univ Technol, Fac Engn & Built Environm, Dept Chem Met & Mat Engn, Pretoria, South Africa

来源：

EMERGENT MATERIALS | 2025年 / 8卷 / 03期

关键词：

Si3N4/TiAl composite; TiAl alloy; Field-assisted sintering technique; Microstructure; Mechanical properties; In-situ phases; TENSILE PROPERTIES; BEHAVIOR; TEMPERATURE; EVOLUTION; PHASE; GAMMA; WEAR; NANOINDENTATION; FABRICATION; TI5SI3;

D O I：

10.1007/s42247-024-00831-w

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, fully densified Si3N4/TiAl composites were fabricated using the field-assisted sintering technique (FAST). Microstructural analysis showed the evolution of a continuous network structure consisting of minor fractions of in-situ formed Ti2AlN, unreacted Si3N4 ceramic particles and dominant Ti5Si3 intermetallic phases within the TiAl matrix at Si3N4 content above 1.5 wt%. The hardness of the developed composites increases with increasing Si3N4 content, with 7Si(3)N(4)/TiAl composite exhibiting the highest hardness of approximately 487 HV1.0, which was about 57% higher than that of the sintered pure TiAl alloy. Among the sintered samples, 1.5Si(3)N(4)/TiAl composite displayed the highest flexural strength of 832.65 +/- 12.88 MPa (34.3% higher than pure TiAl matrix) with a deflection of 0.14 mm. In contrast, the lowest flexural strength and deflection of 535.44 +/- 21.14 MPa and 0.09 mm were obtained in composite reinforced with 7 wt% Si3N4 ceramic content. The fractured surface of the sintered samples displayed predominantly cleavage fracture mode.

引用

页码：1605 / 1618

页数：14

共 54 条

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