Microstructure characterization and mechanical properties of Mo-Y2O3 alloys fabricated by hydrothermal synthesis and spark plasma sintering

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-09-01 DOI:10.1016/j.ceramint.2025.06.261

Liying Yao , Yimin Gao , Yijie Huang , Guojun Zhang

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Abstract

To improve the strength and toughness, Mo-xY₂O₃ (x = 0, 0.3, 0.6, 0.9, and 1.2 wt%) alloys are successfully fabricated by hydrothermal synthesis and spark plasma sintering. The effects of Y₂O₃ addition on microstructure, mechanical properties, and strengthening and toughening mechanisms are investigated in detail. Results show that the addition of Y₂O₃ particles greatly refines Mo grains. The majority of dispersed Y₂O₃ particles are semi-coherent intragranular particles, showing an ultrafine size of 99 nm and a high number density of 4.38 × 10¹⁷ m⁻³, while a small fraction consists of intergranular particles averaging 215 nm. This contributes to the excellent mechanical properties of the Mo-0.9Y₂O₃ alloy, with yield strength of 990 MPa, compressive strain of 9.97 %, and microhardness of 381 MPa, respectively. However, both the yield strength and compressive strain decrease with Y₂O₃ addition beyond 0.9 wt%. The strengthening mechanisms are quantitatively evaluated, revealing that the increase in yield strength is mainly attributed to grain refinement strengthening and Orowan strengthening. Furthermore, there is a competition between the substantial plastic deformation induced by grain refinement and the detrimental fracture caused by intergranular particles, both contributing to the toughness of Mo alloys.

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水热合成-放电等离子烧结Mo-Y2O3合金的组织表征及力学性能

为了提高Mo-xY2O3 （x = 0,0.3, 0.6, 0.9和1.2 wt%）合金的强度和韧性，通过水热合成和火花等离子烧结成功制备了Mo-xY2O3 （x = 0,0.3, 0.6, 0.9和1.2 wt%）合金。研究了添加Y2O3对合金组织、力学性能和强化增韧机理的影响。结果表明，Y2O3颗粒的加入使Mo晶粒细化。分散的Y2O3颗粒大部分是半相干的晶内颗粒，其超细尺寸为99 nm，数量密度为4.38 × 1017 m−3，而一小部分由平均为215 nm的晶间颗粒组成。这使得Mo-0.9Y2O3合金具有优异的力学性能，屈服强度为990 MPa，压缩应变为9.97%，显微硬度为381 MPa。然而，当Y2O3添加量超过0.9 wt%时，屈服强度和压缩应变均下降。结果表明，屈服强度的提高主要是由于晶粒细化强化和Orowan强化。此外，晶粒细化引起的大量塑性变形与晶间颗粒引起的有害断裂之间存在竞争，两者都有助于Mo合金的韧性。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.