Vacuum hot pressing of gas-atomized Ni–Zr–Ti–Si–Sn amorphous powder
Vacuum hot pressing of gas-atomized Ni–Zr–Ti–Si–Sn amorphous powder
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DOI：
10.1016/j.msea.2003.11.015
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发表时间：
2004-03
期刊：
影响因子：
6.4
通讯作者：
Yoon-Bae Kim;H. Park;W. Jeung;Jong-Soo Bae
中科院分区：
文献类型：
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作者：
Yoon-Bae Kim;H. Park;W. Jeung;Jong-Soo Bae
采用气体雾化法制备了无结晶度的Ni57Zr20Ti18Si3Sn2全非晶粉末，其粒度范围在75μm以下。气雾化Ni57Zr20Ti18Si3Sn2非晶粉末的玻璃化转变温度(Tg)为828K，晶化温度(Tx)为886K。气雾化Ni57Zr20Ti18Si3Sn2非晶粉末的过冷液相区(ΔTx)为58K。在确定的固结条件下，用真空热压装置对气雾化Ni57Zr20Ti18Si3Sn2非晶粉末进行了固结。通过对Ni57Zr20Ti18Si3Sn2非晶粉末的等温退火热处理，确定了最佳固结条件。固结后的Ni57Zr20Ti18Si3Sn2块体样品在加工过程中表现为完全非晶态。固结块体Ni57Zr20Ti18Si3Sn2的相对密度和硬度分别大于99%和800Hv。
Fully amorphous Ni57Zr20Ti18Si3Sn2powders without any crystallinity are successfully fabricated in the particle size range below 75μm by gas-atomization method. Gas-atomized Ni57Zr20Ti18Si3Sn2amorphous powder exhibits the glass transition temperature (Tg) of 828K and the crystallization temperature (Tx) of 886K. The gas-atomized Ni57Zr20Ti18Si3Sn2amorphous powder posesses a supercooled liquid region (ΔTx) of 58K. Based on the determined consolidation condition, the gas-atomized Ni57Zr20Ti18Si3Sn2amorphous powder was consolidated by a vacuum hot pressing apparatus. The optimum consolidation conditions were determined by isothermal annealing of Ni57Zr20Ti18Si3Sn2amorphous powder. The consolidated bulk Ni57Zr20Ti18Si3Sn2samples show completely amorphous on processing after consolidation. The relative density and hardness of the consolidated bulk Ni57Zr20Ti18Si3Sn2compacts are greater than 99 % and 800Hv, respectively.