首页|The rapid densification behavior of powder metallurgy Ti alloys by induction heating sintering

The rapid densification behavior of powder metallurgy Ti alloys by induction heating sintering

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Micropores are decisive to mechanical properties and thermal deformation capabilities of powder met-allurgy(P/M)Ti alloys sintered compacts.As a result,achieving express densification is of prime im-portance and has attracted increasing attention recently.Induction heating owns the merits of high effi-ciency,short process,and low cost,and thus has huge potential to be used as a sintering approach for the fabrication of P/M Ti alloys.Nevertheless,the facilitated densification behavior associated with induction heating sintering remains unclear so far.To address it,powder metallurgy Ti6Al4V is manufactured via induction heating sintering with which the underlying sintering mechanism is investigated in-depth.It is found that induction heating could generate a fully densified compact in a remarkably shortened time,demonstrating its superior sintering efficiency as compared with conventional resistance furnace heat-ing.COMSOL finite element analysis reveals that the maximum current density during induction heating can reach 106 A m-2 though the magnetic field strength is solely 0.02 T,leading to a slight tempera-ture difference of approximately 30 ℃ between the interior and exterior of the billet.Furthermore,the rapid heating essentially starts at sharp corners of particles due to the potent current concentration ef-fect,which facilitates the cracking of the particle surface oxide film and thus enhances the direct contact between them.Moreover,the electromigration effect caused by induction current promotes the diffusion capability of elements,giving rise to expedited densification,alloying,and chemical homogenization.This work provides not only critical insight into the sintering mechanism of induction heating sintering but also significant guidance for low-cost powder metallurgy materials preparation.

Titanium alloyPowder metallurgyInduction heating sinteringRadiation heating sinteringCurrent fieldSimulation

Kejia Pan、Xiaotao Liu、Bao Wang、Shuai Gao、Shixing Wu、Ning Li

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State Key Laboratory of Materials Processing and Die & Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

国家重点研发计划国家自然科学基金国家自然科学基金Young Elite Scientists Sponsorship Program by China Association for Science and Technology湖北省自然科学基金Fundamental Research Funds for the Central Universities of Huazhong University of Science and TechnologyState Key Laboratory of Powder Metallurgy,Central South University,Changsha,China

2020YFB20083005197109752301147YESS20210054ZRMS20220008632172021XXJS010

2024

10.1016/j.jmst.2023.10.009

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.181(14)
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