Achieving high performance HPS TiAl based alloy by adjusting sintering process parameters to eliminate heterogeneous microstructure and original powder boundaries

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-04-14 DOI:10.1016/j.intermet.2025.108784

Chengcheng Shi , Yongkang Liu , Yuelong Yuan , Dekai Liu , Rui Liu , Zhen Lu , Nana Guo , Jinzhao Sun

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引用次数: 0

Abstract

The influence of sintering parameters on the microstructural evolution and mechanical properties of Ti-46.5Al-2Cr-1.8Nb-0.2W-0.15B (at.%) alloys fabricated via hot press sintering by adopting pre-alloyed powders are investigated in detail. The results indicated that the alloys were composed of heterogeneous microstructure caused by localized recrystallization and original powder boundaries (OPBs), when densified at insufficient sintering parameters. Hence, the alloys cracked at the interface of heterogeneoum icrostructure or OPBs due to the discontinuity of deformation, resulting in a relative low mechanical property at 800 °C and the hot workability. With increasing the sintering temperature and holding time to 1300 °C and 120min, respectively, the OPBs and heterogeneous microstructure faded away, and the fracture mechanism transformed into micro-void development at the interfaces of deformation twin groups and the DRX grains, which lead to the increase of plasticity. Further increasing the sintering temperature or holding time, the comprehensive mechanical properties decreased due to the coarsening of microstructure. Therefore, the optimal sintering parameters were considered as sintering at 1300 °C with a holding time of 120min. This research can provide a scientific reference for the preparation of high-performance TiAl based alloys by powder metallurgy method.

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通过调整烧结工艺参数，消除异质组织和原始粉末边界，获得高性能HPS TiAl基合金

研究了烧结参数对预合金粉末热压烧结制备Ti-46.5Al-2Cr-1.8Nb-0.2W-0.15B （at.%）合金组织演变和力学性能的影响。结果表明：在烧结参数不充分的情况下致密化时，合金由局部再结晶和原始粉末边界（OPBs）引起的非均匀组织组成；因此，由于变形的不连续性，合金在非均质组织或opb的界面处开裂，导致合金在800℃时的力学性能和热加工性相对较低。当烧结温度和保温时间分别提高到1300℃和120min时，opb和非均相组织逐渐消失，变形孪晶与DRX晶粒界面处的断裂机制转变为微孔洞发育，导致塑性增加。进一步提高烧结温度或保温时间，由于组织粗化，综合力学性能下降。因此，优选的烧结参数为：烧结温度1300℃，保温时间120min。该研究可为粉末冶金法制备高性能TiAl基合金提供科学参考。

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

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.