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首页> 外文期刊>International Journal of Solids and Structures >Fracture of shape memory CuAlNi single crystals
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Fracture of shape memory CuAlNi single crystals

机译：形状记忆CuAlNi单晶的断裂

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The fracture behavior of shape memory CuAlNi single crystals loaded in tension is studied. Specimens cut from a single crystal are notched and loaded in tension until final fracture. Eight different crystallographic orientations of the notch and tensile axes are considered. The stress field at the notch tip triggers a cubic to orthorhombic phase transition in the crystal, which results in a set of twinned martensite plates emanating from the notch tip. As loading increases, a crack forms and grows off the notch tip, with the martensite plates continuing to appear at the growing crack. Details of the crack growth depend strongly on both the type of singular microstructures that forms and how this microstructure interacts with the growing crack. In one group of orientations a distinct transformation zone forms along one flank of the crack and the motion of this zone is directly connected to the crack growth. In a second group of orientations, the microstructure formation is not as strongly tied to the crack. Interestingly, in all specimens studied, the final crack direction is approximately 80degrees from the direction of the martensite plates. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 18]
机译：研究了拉伸状态下形状记忆CuAlNi单晶的断裂行为。从单晶切割出的样品被刻槽，并在张力下加载，直到最终断裂。缺口和拉伸轴的八个不同的晶体学取向被考虑。缺口尖端处的应力场触发了晶体中立方到正交的相变，从而导致了一组从缺口尖端散发出来的孪晶马氏体板。随着载荷的增加，裂纹形成并从缺口尖端长出，马氏体板继续出现在不断扩展的裂纹处。裂纹扩展的细节在很大程度上取决于所形成的奇异微观结构的类型以及该微观结构与扩展裂纹的相互作用方式。在一组取向中，沿裂纹的一个侧面形成了一个明显的相变区，该区的运动直接与裂纹扩展相关。在第二组取向中，微观结构的形成与裂纹的联系不那么牢固。有趣的是，在所有研究的样品中，最终的裂纹方向都与马氏体板的方向成80度左右。 （C）2002 Elsevier ScienceLtd。保留所有权利。 [参考：18]

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