Effect of Zirconium Oxide Reinforcement on Microstructural, Electrochemical, and Mechanical Properties of TiNi Alloy Produced via Powder Metallurgy Route

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL Journal of Engineering Materials and Technology-transactions of The Asme Pub Date : 2021-10-01 DOI:10.1115/1.4051308
S. A. Raza, M. Khan, M. R. A. Karim, R. Ali, M. Naseer, S. Z. Abbas, M. Ahmad
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引用次数: 3

Abstract

Equiatomic TiNi alloy composites, reinforced with 0, 5, 10, and 15 vol% ZrO2, were synthesized using conventional sintering approach. Equiatomic TiNi pre-alloyed powder and ZrO2 powder were mixed in planetary ball mill for 6 h followed by cold compaction and pressure-less sintering, respectively. The sintered density was found to vary inversely with the addition of ZrO2 content. The X-ray diffraction (XRD) spectra have shown the formation of multiple-phases which were resulted from the decomposition of the B19′ and B2 phases of the equiatomic TiNi alloy due to the addition of ZrO2 and higher diffusion rate of Ni than that of Ti in the alloy composite. An increase in hardness was noted due to the addition of ZrO2, measured by micro and nanoindentation techniques. Potentiodynamic polarization scan revealed a 10% decrease in the corrosion rate of the composite containing 10 vol% ZrO2. Electrochemical impedance spectroscopy (EIS) results indicated an increase in passive layer resistance (Rcoat) due to the increase in charge transfer resistance (Rct) caused by the reduced leaching of ions from the surface.
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氧化锆增强对粉末冶金法制备TiNi合金组织、电化学和力学性能的影响
采用常规烧结方法合成了0、5、10和15 vol% ZrO2增强的等原子TiNi合金复合材料。等原子ti预合金粉和ZrO2粉分别在行星球磨机中混合6 h,然后进行冷压和无压烧结。烧结密度随ZrO2含量的增加呈反比变化。x射线衍射(XRD)结果表明,加入ZrO2后,等原子TiNi合金的B19′和B2相分解形成多相,且合金复合材料中Ni的扩散速率高于Ti。通过微压痕和纳米压痕技术测量,发现由于添加了ZrO2,硬度有所增加。动电位极化扫描显示,含ZrO2含量为10 vol%的复合材料的腐蚀速率降低了10%。电化学阻抗谱(EIS)结果表明,钝化层电阻(Rcoat)增加是由于离子从表面浸出减少导致电荷转移电阻(Rct)增加所致。
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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