Polycrystalline γ-boron: As hard as polycrystalline cubic boron nitride

SCRIPTA MATERIALIA

卷:67

Article

Qin, Jiaqian¹  Nishiyama, Norimasa¹  Ohfuji, Hiroaki¹  Shinmei, Toru¹  Lei, Li^1,2  He, Duanwei²  Irifune, Tetsuo¹ 

[1] Ehime Univ, Geodynam Res Ctr, Matsuyama, Ehime 7908577, Japan

[2] Sichuan Univ, Inst Atom & Mol Phys, Chengdu 610065, Peoples R China

关键词: Polycrystalline boron;    Elastic modulus;    Hardness;    Fracture toughness;   

DOI  :  10.1016/j.scriptamat.2012.04.032

来源: Elsevier

【 摘 要 】

The Vickers hardness of polycrystalline gamma-boron (gamma-B) was measured using a diamond indentation method. The elastic properties of polycrystalline gamma-B were determined using an ultrasonic measurement method. Under a loading force of up to 20 N our test gave an average Vickers hardness in the asymptotic hardness region around 30.3 GPa. We also measured the hardness and elastic properties of polycrystalline beta-B and cubic boron nitride Ti3SiC2 (PcBN) for comparison. The hardness and elastic properties of polycrystalline gamma-B were found to be very close to those of PcBN. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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