Microstructure and Mechanical Properties of NiTi-Based Eutectic Shape Memory Alloy Produced via Selective Laser Melting In-Situ Alloying by Nb

被引：20

作者：

Polozov, Igor ^{[1
]}

Popovich, Anatoly ^{[1
]}

机构：

[1] Peter Great St Petersburg Polytech Univ, Inst Mech Engn Mat & Transport, Polytechnicheskaya 29, St Petersburg 195251, Russia

来源：

MATERIALS | 2021年 / 14卷 / 10期

关键词：

additive manufacturing; powder bed fusion; nitinol; PHASE-TRANSFORMATION; INTERMETALLIC ALLOY; PROCESS PARAMETERS; BEHAVIOR; EVOLUTION; DENSIFICATION; DEFORMATION; COMPOSITE; CAPACITY; TITANIUM;

D O I：

10.3390/ma14102696

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This paper presents the results of selective laser melting (SLM) process of a nitinol-based NiTiNb shape memory alloy. The eutectic alloy Ni45Ti45Nb10 with a shape memory effect was obtained by SLM in-situ alloying using a powder mixture of NiTi and Nb powder particles. Samples with a high relative density (>99%) were obtained using optimized process parameters. Microstructure, phase composition, tensile properties, as well as martensitic phase transformations temperatures of the produced alloy were investigated in as-fabricated and heat-treated conditions. The NiTiNb alloy fabricated using the SLM in-situ alloying featured the microstructure consisting of the NiTi matrix, fine NiTi+beta-Nb eutectics, as well as residual unmelted Nb particles. The mechanical tests showed that the obtained alloy has a yield strength up to 436 MPa and the tensile strength up to 706 MPa. At the same time, in-situ alloying with Nb allowed increasing the hysteresis of martensitic transformation as compared to the alloy without Nb addition from 22 to 50 degrees C with an increase in A(f) temperature from -5 to 22 degrees C.

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页数：11

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