Microstructural Evolution and Mechanical Properties of a Multicomponent Nb-16Si-22Ti-2Al-2Hf-2Cr Alloy Prepared by Reactive Hot Press Sintering
Microstructural Evolution and Mechanical Properties of a Multicomponent Nb-16Si-22Ti-2Al-2Hf-2Cr Alloy Prepared by Reactive Hot Press Sintering
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反应热压烧结多组分Nb-16Si-22Ti-2Al-2Hf-2Cr合金的显微组织演变和力学性能
DOI：
10.1007/s11661-012-1571-0
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发表时间：
2013-05
期刊：
影响因子：
--
通讯作者：
Sha Jiangbo
中科院分区：
文献类型：
--
作者：
Liu Wei;Fu Yongmin;Sha Jiangbo
研究了球磨时间、热压温度和热处理等反应热压烧结工艺参数对Nb-16 Si-22 Ti-2 Hf-2Al-2Cr多元合金的相组成、显微组织和室温力学性能的影响。显微组织分析表明，烧结态和热处理态的样品主要由Nb和Ti固溶体（NbSS和TiSS）以及硅化铌β-Nb 5Si 3基体组成，并含有少量Hf固溶体（HfSS）。通过在1773 K和1873 K（1500 °C和1600 °C）下烧结，由5和10球磨的粉末混合物制备的样品中的大部分NbSS相显示出窄条形貌。当研磨时间增加到20小时时，形态变为近等轴形状，其随着研磨时间的增加而变得更细。与此相反，在所有的烧结样品中的TiSS相或多或少具有近等轴形状。在1773 K（1500 °C）下退火50 h后，NbSS和TiSS均发生球化倾向。当球磨时间从5 h延长到20 h时，β-Nb 5Si 3和TiSS相的体积分数增加，而NbSS相的体积分数减少。这导致烧结态和热处理态试样的断裂韧性KQ降低，维氏硬度Hv提高。还进行了断口分析，以阐明相的断裂行为，特别强调相和裂纹之间的相互作用。
In this paper, the effect of reactive hot press sintering (RHPS) parameters, such as milling time, hot pressing temperature, and heat treatment, on phase constitution, microstructure, and room temperature mechanical properties of a multicomponent Nb-16Si-22Ti-2Hf-2Al-2Cr alloy prepared from ball milled powder mixture is investigated. Evaluation of the microstructure revealed that all as-sintered and heat-treated samples mainly consisted of particles of Nb and Ti solid solutions (NbSSand TiSS), as well as a niobium silicideβ-Nb5Si3matrix, with a small quantity of Hf solid solution particles (HfSS). By sintering at 1773 K and 1873 K (1500 °C and 1600 °C), most of the NbSSphase in the samples prepared from 5 and 10 ball milled powder mixtures showed a narrow strip morphology. Upon increasing the milling time to 20 hours, the morphology changed to a near-equiaxed shape, which became finer with increased milling time. In contrast, the TiSSphase in all as-sintered samples more or less had a near-equiaxed shape. Spheroidizing tendency took place in both NbSSand TiSSphases during an annealing heat treatment at 1773 K (1500 °C) for 50 hours. Interestingly, when the milling time was extended from 5 to 20 hours, the volume fractions of theβ-Nb5Si3and TiSSphases increased, whereas that of the NbSSphase decreased. This resulted in the reduction of the fracture toughnessKQand an enhancement of the Vickers hardnessHvof the bulk as-sintered and heat-treated samples. A fractography analysis was also carried out to elucidate the fracture behavior of phases, with particular emphasis on the interaction between phases and cracks.
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