Study on sintering density and microstructure of metal injection molding of TiAl alloy using a new blend powder combination

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2025-05-15 Epub Date: 2025-03-15 DOI:10.1016/j.powtec.2025.120936

Ce Zhang , Hanlin Wang , Rui Liu , Jiazhen Zhang , Xin Lu

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Abstract

In this work, a novel low-cost blend powder system including spherical Ti powder, irregular TiAl₃ powder, and TiH₂ powder is used to prepare MIM Ti48Al alloy. The optimum powder loading of the blend powder reaches 59 %, which is essentially equivalent as pre-alloyed spherical powder. The viscosity of feedstock using this powder system meets the requirement of injection molding operation. By including a suitable quantity of ultrafine TiH₂ powder, the sinterability is greatly enhanced, resulting in a relative density above 98 % at a temperature of 1350 °C when the addition ratio is 4.5–9 wt%. The microstructure evolution at different sintering temperatures is also studied in detail. The original TiAl₃ particles undergo a transformation into the γ phase, whereas the Ti powder particles ultimately form α₂ + γ lamellar colonies. As the sintering temperature increases, the lamellar colonies grow and merge to form near- lamellar and full- lamellar structure.

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新型混合粉末组合对TiAl合金注射成形的烧结密度和显微组织的研究

本文采用球形Ti粉、不规则TiAl3粉和TiH2粉的低成本混合粉末体系制备了MIM Ti48Al合金。混合粉的最佳装粉量达到59%，与预合金球形粉基本相当。该粉体系统的给料粘度满足注塑作业的要求。通过加入适量的超细TiH2粉末，烧结性能大大提高，当添加比为4.5-9 wt%时，在1350℃的温度下，相对密度达到98%以上。并对不同烧结温度下的微观组织演变进行了详细研究。原始TiAl3颗粒转变为γ相，而Ti粉末颗粒最终形成α2 + γ片层集落。随着烧结温度的升高，片层集落生长并合并形成近片层和全片层结构。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.