Evading the strength and machinability trade-off in AlN-BN/Mo functionally graded material via reacted phases distribution

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2025-09-30 DOI:10.1016/j.matlet.2025.139588

Yueqi Wu , Yunzi Li , Mingyong Jia , Qiang Shen , Fei Chen

引用次数: 0

Abstract

AlN/Mo composites are promising for aerospace thermal protection systems but suffer from a critical strength-machinability trade-off. This work presents a novel AlN-BN/Mo functionally graded material (FGM) that successfully resolves this conflict. Fabricated via a gradient sintering strategy using Field-Assisted Sintering Technology (FAST), the FGM exhibits an exceptional synergy of properties, achieving an ultrahigh flexural strength of 971.9 MPa alongside excellent machinability. The material's performance originates from a temperature-induced gradient in its microstructure and phase composition. This graded structure features softer, machinable AlN-BN-rich ends supported by a robust, high-strength Mo-rich core. This core's uniform composite microstructure is the primary source of the material's superior strength, offering an effective pathway for developing reliable high-temperature components.

查看原文本刊更多论文

通过反应相分布避免AlN-BN/Mo功能梯度材料的强度和可加工性权衡

AlN/Mo复合材料在航空航天热防护系统中很有前途，但在强度和可加工性之间存在着关键的权衡。这项工作提出了一种新的AlN-BN/Mo功能梯度材料（FGM），成功地解决了这一冲突。通过使用场辅助烧结技术（FAST）的梯度烧结策略制造，FGM表现出优异的性能协同作用，实现了高达971.9 MPa的超高抗弯强度以及优异的可加工性。该材料的性能源于其微观结构和相组成的温度诱导梯度。这种分级结构具有更柔软、可加工的富铝bn末端，由坚固、高强度富钼核心支撑。该芯的均匀复合微观结构是材料卓越强度的主要来源，为开发可靠的高温部件提供了有效途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive