Refined martensite and enhanced strength of selective laser melted Ti6.5Al2.5Zr1Mo1V matrix composites by minor nano TiBw addition

Refined martensite and enhanced strength of selective laser melted Ti6.5Al2.5Zr1Mo1V matrix composites by minor nano TiBw addition

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Qi An^a^,^b, Lihua Cui^a, Delong Gong^a, Han Cheng^a, Ying Liu^a, Rui Zhang^a, Yang Bao^a, Lujun Huang^a^,^b^,^*, Lin Geng^a^,^b

Transactions of Materials Research | 2025, 1(1) : 100014

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Transactions of Materials Research | 2025, 1(1): 100014

• METALLIC MATERIALS •

Refined martensite and enhanced strength of selective laser melted Ti6.5Al2.5Zr1Mo1V matrix composites by minor nano TiBw addition

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Qi An^a^,^b, Lihua Cui^a, Delong Gong^a, Han Cheng^a, Ying Liu^a, Rui Zhang^a, Yang Bao^a, Lujun Huang^a^,^b^,^*, Lin Geng^a^,^b

Affiliations

^aSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

^bState Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin, 150001, China

Published: 2025-04-08 doi: 10.1016/j.tramat.2025.100014

Outline

Abstract

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To achieve strength improvement while ensuring a certain degree of plasticity of titanium matrix composites (TMCs) by selective laser melting (SLM), minor TiB₂ particles were used to fabricate in situ TiB whiskers (TiBw) reinforced Ti6.5Al2.5Zr1Mo1V composites in this work. It is found that pore defects in the as-printed TMCs reduce with the decreasing energy density. The porosity of as-printed TMCs decreases to 0.0005% under an optimized energy density of 61 J·mm^-3. To establish the relationship between porosity and SLM parameters, a systematic investigation of the influence of SLM parameters on the microstructure of TMCs is conducted, and the microstructure evolution is clarified during complex thermal cycling. The nano TiBw effectively hinders the coarsening of hierarchical martensite during the complex thermal cycles. As a result, the martensite plate thickness is approximately 60% in comparison with the as-printed Ti6.5Al2.5Zr1Mo1V alloy. A remarkable strengthening effect is achieved with minor TiBw, resulting in an impressive tensile strength of 1432 MPa and yield strength of 1320 MPa, while an elongation rate of 4.0% is maintained.

Key words

Titanium matrix composites / Selective laser melting / Minor TiBw / Microstructure evolution / Strengthening mechanisms

Cite this Article

Qi An, Lihua Cui, Delong Gong, Han Cheng, Ying Liu, Rui Zhang, Yang Bao, Lujun Huang, Lin Geng. Refined martensite and enhanced strength of selective laser melted Ti6.5Al2.5Zr1Mo1V matrix composites by minor nano TiBw addition[J]. Transactions of Materials Research, 2025 , 1 (1) : 100014 - . DOI: 10.1016/j.tramat.2025.100014

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Funding

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National Natural Science Foundation of China(52371135; 52201156; 52261135543; 52401039)
China Postdoctoral Science Foundation(2024T171151)
Young Elite Scientists Sponsorship Program by CAST(2023QNRC001)

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Year 2025 volume 1 Issue 1

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Article Info

doi: 10.1016/j.tramat.2025.100014

Receive Date：2025-03-28
Online Date：2026-06-10
Published：2025-04-08

Article Data

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History

Received：2025-03-28
Revised：2025-04-07
Accepted：2025-04-07

Funding

National Natural Science Foundation of China(52371135; 52201156; 52261135543; 52401039)

China Postdoctoral Science Foundation(2024T171151)

Young Elite Scientists Sponsorship Program by CAST(2023QNRC001)

Affiliations

^aSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

^bState Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin, 150001, China

Corresponding:

^* School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China. E-mail address: huanglujun@hit.edu.cn (L. Huang).

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表12种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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