Microstructure and room temperature mechanical properties of hot-pressed Nb–Si–Ti–Fe alloys
Microstructure and room temperature mechanical properties of hot-pressed Nb–Si–Ti–Fe alloys
复制标题
热压Nb-Si-Ti-Fe合金的显微组织和室温力学性能
DOI：
10.1016/j.jallcom.2010.04.208
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发表时间：
2010-07
影响因子：
6.2
通讯作者：
K.F. Zhang
中科院分区：
文献类型：
--
作者：
G. Wang;X.L. Wang;K.F. Zhang
以球磨Nb-Si-Ti-Fe粉末为原料，采用单轴热压法制备了不同钛、铁、钛含量的Nb-Si-Ti-Fe混合粉末，研究了钛和/或铁对球磨、显微组织和室温力学性能的影响。结果表明，在相同的球磨参数下，钛的加入抑制了球磨过程。元素图谱显示，热压合金中含有Nb4FeSi相，Fe主要固溶于Nb4FeSi相中。钛的加入提高了NbSS中Si的溶解度，而在含钛合金中没有观察到预期的Nb3Si，这可能是由于颗粒之间的反应区中的钛含量较低所致。热压时间越短，Nb-Si-Fe合金组织越粗大，Nbss呈窄条状，呈河流状分布，而Nb-Si-Fe合金则获得近等轴状宏观组织。钛合金的室温断裂韧性和弯曲强度都得到了提高。分别从裂纹桥联的延性相增韧和固溶强化两个方面探讨了其增韧和强化机制。
Bulk alloys were fabricated by uniaxial hot pressing from ball milled Nb-Si–Ti–Fe powder mixtures with the fixed Si content (16at.%) and various compositions of Ti and Fe, and the effects of Ti and/or Fe on the ball milling, microstructure and room temperature mechanical properties of the materials were investigated. It was revealed that the Ti addition inhibited the ball milling process with the same milling parameters. For the hot-pressed alloys, Nb4FeSi phase was detected in the alloys containing Fe, and Fe mainly dissolved into niobium silicides from the result of elemental mapping. The solubility of Si in Nbss was enhanced by the addition of Ti, and Nb3Si expected was not observed in the Ti-bearing alloys that may be due to the lower Ti content in the reaction zone between the particles. The Ti-added alloys hot pressed from a shorter time showed the coarser microstructure with Nbss in the shape of narrow strip distributed in river pattern, while near-equiaxed macrostructure was obtained in the Nb–Si–Fe alloys. The improvement in both room temperature fracture toughness and flexural strength was achieved in Ti-added alloys. The toughening and strengthening mechanisms were discussed from the ductile-phase toughening of crack bridging and solid solution strengthening, respectively.
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影响因子：
4.4
作者：
K. Zelenitsas;P. Tsakiropoulos
通讯作者：
K. Zelenitsas;P. Tsakiropoulos
影响因子：
4.4
作者：
Vellios, N.;Tsakiropoulos, P.
通讯作者：
Tsakiropoulos, P.
影响因子：
4.5
作者：
Xudong Sun;J. Yeomans
通讯作者：
Xudong Sun;J. Yeomans
DOI：
10.1007/s11661-001-1024-7
发表时间：
2001-11
期刊：
Metallurgical and Materials Transactions A
影响因子：
--
作者：
K. Chan;D. Davidson
通讯作者：
K. Chan;D. Davidson
DOI：
10.1007/bf02667370
发表时间：
1991-07-01
期刊：
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
影响因子：
--
作者：
MENDIRATTA, MG;LEWANDOWSKI, JJ;DIMIDUK, DM
通讯作者：
DIMIDUK, DM