Dual-grained size effect induced simultaneous enhancement of hardness-strength-toughness in TaC-modified Ti(C, N)-based cermets

IF 4.2 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-03-06 DOI:10.1016/j.ijrmhm.2025.107135

Sheng-Jian Zhou , Jia-Hu Ouyang , Wen-Tao Su , Jing-Xin Tian , Xiang-Rui Kong , Chen-Guang Xu , Ying Li , Yu-Jin Wang , Lei Chen , Yu Zhou

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Abstract

A trade-off is required to balance the hardness, strength and toughness of Ti(C, N)-based cermets, which remains a significant challenge due to the inherent contradiction between hardness (or strength) and toughness. In this work, a simple powder metallurgy process was used to prepare Ti(C, N)-based cermets with a dual-grained structure by refractory TaC modification and raw powder grading strategy. The microstructure formation process and synergistic enhancement mechanism of hardness, strength and toughness in the dual-grained Ti(C, N)-based cermets were elucidated. The formation of a dual-grained structure is attributed to selective dissolution and reprecipitation resulting from the difference in chemical potentials of both various carbonitrides and different-sized particles. As compared with conventional Ti(C, N)-based cermets prepared by only using submicron-sized raw powders, the dual-grained Ti(C, N)-based cermets modified by TaC achieve a distinct increase in Vickers hardness of about 14 %, in flexural strength of about 25 %, and in fracture toughness of 6 %. The hardness-toughness trade-off is significantly superior to those of conventional submicron-sized Ti(C, N)-based cermets using the same sintering method and even commercial Ti(C, N)-based cermets. This work offers a simple, novel and low-cost method to develop metal-ceramic composites with simultaneous enhancement of hardness, strength and toughness.

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双晶粒尺寸效应诱导tac改性Ti（C， N）基陶瓷的硬度-强度-韧性同时增强

由于硬度（或强度）与韧性之间的内在矛盾，需要权衡Ti（C， N）基金属陶瓷的硬度、强度和韧性，这仍然是一个重大挑战。本文采用简单的粉末冶金工艺，通过耐火TaC改性和原料粉分级策略制备了具有双晶结构的Ti（C， N）基陶瓷。研究了双晶Ti（C， N）基陶瓷的显微组织形成过程和硬度、强度、韧性协同增强机理。双晶结构的形成是由于不同碳氮化物和不同粒径颗粒化学势的差异导致的选择性溶解和再沉淀所致。与仅使用亚微米级原料粉末制备的传统Ti（C， N）基金属陶瓷相比，经TaC改性的双晶Ti（C， N）基金属陶瓷的维氏硬度明显提高约14%，弯曲强度提高约25%，断裂韧性提高6%。硬度和韧性的权衡明显优于使用相同烧结方法的常规亚微米级Ti（C， N）基陶瓷，甚至优于商业Ti（C， N）基陶瓷。这项工作提供了一种简单、新颖和低成本的方法来开发同时提高硬度、强度和韧性的金属陶瓷复合材料。

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

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.