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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Influence of solution heat treatment on the microstructural evolution and mechanical behavior of 60NiTi
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Influence of solution heat treatment on the microstructural evolution and mechanical behavior of 60NiTi

机译：溶液热处理对60niti的微观结构演化与力学行为的影响

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摘要

The microstructures and mechanical properties of 60NiTi alloys after solution treated at 980 degrees C, 1005 degrees C, 1030 degrees C and 1055 degrees C for 2 h, 4 h, 8 h were studied. The results showed that there was undissolved Ni3Ti phase in the specimens after heat treated at 980 degrees C and 1005 degrees C for 8 h, and the specimens consisted of Ni3Ti, B2 NiTi and Ni4Ti3 phase. The volume fraction of the Ni4Ti3 phase was about 36% and 46% respectively. After heated at 1030 degrees C and 1055 degrees C for 8 h, specimens consisted of B2 NiTi and Ni4Ti3 phase, and the Ni3Ti phase was totally dissolved into the matrix. As a result, the volume fraction of Ni4Ti3 phase increased to 69% and 64%. Higher density of the Ni4Ti3 phase contributed to the higher hardness and higher ultimate compressive strength. The fracture modes of samples after solution treated were mainly quasi-cleavage fracture. The undissolved Ni3Ti phase improved the fracture toughness of the binary alloy. Crack propagation path in Ni3Ti rich area was featured by a zigzag mode, which indicated that Ni3Ti phase displayed positive effect on fracture toughness. The toughening mechanism of 60NiTi with Ni3Ti phase is emphasized. (C) 2018 Elsevier B.V. All rights reserved.
机译：溶液在980℃下处理后60℃，1030℃和1055℃的微观结构和力学性能研究2小时，4小时，8小时。结果表明，在980℃和1005℃的热处理8小时后，试样在样品中存在未溶解的Ni3Ti相，并由Ni3Ti，B2 Niti和Ni4Ti3相组成。 Ni4Ti3相的体积分别分别为约36％和46％。在1030℃和1055℃下加热8小时后，由B2 Niti和Ni4Ti3相组成，将Ni3Ti相完全溶解在基质中。结果，Ni4Ti3相的体积分数增加至69％和64％。 Ni4Ti3相的较高密度有助于更高的硬度和更高的极限抗压强度。溶液处理后样品的裂缝模式主要是准切割骨折。未溶解的Ni3Ti相改善了二元合金的断裂韧性。富曲线区域的裂纹传播路径由Z字形模式特征，表明Ni3Ti相对骨折韧性显示出积极影响。强调了60niti具有Ni3Ti相的增韧机理。 （c）2018年elestvier b.v.保留所有权利。

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