Ti对WC-10AlCoCrFeNiTi_(x)合金组织及性能影响  

Effects of Ti on Microstructure and Mechanical Properties of WC-10AlCoCrFeNiTi_(x) Cemented Carbide

作　　者：黄丽容[1] 黄必华 谢俊杰 王云 Huang Lirong;Huang Bihua;Xie Junjie;Wang Yun(School of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology;Chongyi Zhangyuan Tungsten Co.,Ltd.)

机构地区：[1]江西理工大学机电工程学院 [2]崇义章源钨业股份有限公司

出　　处：《特种铸造及有色合金》2023年第1期50-55,共6页Special Casting & Nonferrous Alloys

基　　金：江西省自然科学基金资助项目(20171BAB206030);赣州市重点研发计划工业领域,创新领军人才计划资助项目(赣市科发[2020]60号)。

摘　　要：采用机械合金化法制备AlCoCrFeNiTi_(x)高熵合金粉末,通过真空烧结制备WC-10AlCoCrFeNiTi_(x)硬质合金,研究高熵合金粘结相中不同Ti含量对合金微观组织及力学性能的影响。结果表明,随着Ti含量增加,高熵合金粘结相的XRD特征峰向左偏移,WC平均晶粒尺寸减小,合金的强度和硬度增大,硬度(HV_(30))峰值可达2 020,而断裂韧度则表现出先降后升再降的趋势;合金中存在部分Al和Ti的氧化物“黑洞”;Ti含量增加使粘结相硬化,降低其塑性,不利于压制从而导致合金的相对密度下降。AlCoCrFeNiTi_(x)high-entropy alloy powders were prepared by mechanical alloying method, and WC-10AlCoCrFeNiTi_(x)cemented carbide was fabricated by vacuum sintering. Effects of Ti content in the bonding phase on microstructure and mechanical properties of the cemented carbide were investigated.The results indicate that with the Ti content increasing, the XRD characteristic peaks of the high entropy alloy bonding phase shift to the left, where the average grain size of WC is decreased, the strength and hardness are increased, and peak hardness reaches 2 020 HV, while the fracture toughness is decreased firstly, then increased and finally decreased. “Black holes” of Al and Ti oxides in the cemented carbide were observed.The bonding phase is hardened with Ti content increasing, reducing the plasticity, which is adverse to pressing, leading to the decrease of relative density.

关 键 词：硬质合金 高熵合金粘结相 TI 微观组织 力学性能 

分 类 号：TG139[一般工业技术—材料科学与工程] TB331[金属学及工艺—合金]