High work-hardening effect of the pure NiAl intermetallic compound fabricated by the combustion synthesis and hot pressing technique
High work-hardening effect of the pure NiAl intermetallic compound fabricated by the combustion synthesis and hot pressing technique
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DOI：
10.1016/j.matlet.2011.05.091
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发表时间：
2011-09
影响因子：
3
通讯作者：
H. Zhao;F. Qiu;Shenbao Jin;Q. Jiang
中科院分区：
文献类型：
--
作者：
H. Zhao;F. Qiu;Shenbao Jin;Q. Jiang
采用燃烧合成和热压工艺制备了纯NiAl金属间化合物。显微组织分析表明，NiAl金属间化合物晶粒细小。X射线衍射分析和高分辨透射电镜研究表明，在金属间化合物中的相是唯一的NiAl相。NiAl合金具有优异的压缩性能。NiAl的真极限压缩强度和断裂应变分别为1002 - 94+ 72 MPa和21.6 - 1.8+ 1.8%。加工硬化能力（Hc）为1.40−0.07+ 0.09，维氏显微硬度为360−19+ 15 HV。基体中细小的晶粒、高密度的位错和严重畸变的晶格以及位错间的强烈相互作用是该合金优异压缩性能的主要原因。
The pure NiAl intermetallic compound was fabricated by the combustion synthesis and hot pressing technique. Microstructure examination showed that the NiAl intermetallic compound contained fine grains. Analysis of the X-ray diffraction and the HRTEM studies showed that the phase in the intermetallics was the only NiAl phase. The NiAl showed prominent compression properties. The true ultimate compression strength and the fracture strain of the NiAl are 1002−94+72MPa and 21.6−1.8+1.8%, respectively. The work-hardening capacity (Hc) is 1.40−0.07+0.09and the Vickers micro-hardness is 360−19+15HV. The finer grains, the high density dislocation and the seriously distorted lattices in the matrix, and the intense interactions between dislocations contribute to the prominent compression properties.