Near-fully dense nanocrystalline hafnium via pressureless two-step sintering

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

International Journal of Refractory Metals & Hard Materials Pub Date : 2024-11-20 DOI:10.1016/j.ijrmhm.2024.106971

Liyu Hao , Xuanpu Zhang , Shangkun Shen , Xing Liu , Mingyou Niu , Rong Yan , Xuesong Leng , Engang Fu

引用次数: 0

Abstract

Grain refinement in hafnium (Hf), a typical refractory metal, encounters significant challenges due to its inherent high sintering temperature requirements and uneven sintered capillary force that lead to rapid grain coarsening and inhomogeneity. Herein, we present a novel approach of the pressureless two-step sintering to prepare near-fully dense nanocrystalline Hf with an average grain size of around 40 nm, which represents the smallest grain and highest density for nanocrystalline pure Hf to the date. Such achievements not only broaden the applicability of pressureless two-step sintering but also offer insights to produce large size of finer-grained refractory metals and their alloys.

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通过无压两步烧结制备接近完全致密的纳米铪

铪（Hf）是一种典型的难熔金属，由于其固有的烧结温度要求高，烧结毛细力不均匀，导致晶粒迅速粗化和不均匀化，晶粒细化面临着巨大的挑战。在此，我们提出了一种无压两步烧结的新方法，以制备接近全致密的纳米晶Hf，平均晶粒尺寸约为40 nm，这是迄今为止纳米晶纯Hf中最小晶粒和最高密度的。这些成果不仅拓宽了无压两步烧结的适用性，而且为生产大尺寸细晶难熔金属及其合金提供了新的思路。

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.