γ/γ′-α-Mo定向共晶具有良好的力学性能,特别是在垂直于生长方向上,尚有一定塑性。本文研究了加载方向对瞬时拉伸性能的影响。当加载方向偏离生长方向时,瞬时拉伸强度和塑性随之下降。即使在加载方向垂直于生长方向时,断裂强度仍在900MN/m~2以上,延伸率也能保持在3％左右。在动态拉伸过程中,观察到两种断裂形式:纤维本身的断裂和纤维与基体界面的开裂。在范性形变出现以后,基体的滑移可以通过α-Mo纤维。一般是较粗的纤维首先断裂,纤维与基体界面的开裂是导致试样最后断裂的主要原因。
A study was made of the off-axis tensile properties of γ/γ'-a-Mo DS eutectic and of observation of the dynamic fracture process by SEM. If the loading direction deviates from the Mo fibre growth direction, the tensile strength and ductility decrease gradually. During the loading process, two types of cracking are observed: one is cracking of the fibre, and the other is delamination along the fibre-matrix interface. In plastic deformation, slip can pass through both the matrix and the fibre. As a rule, the thicker fibers are cracked earlier than the thinner ones, because they have less defects and better ductility. Delamination is the main source of final fracture.
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