位移速率对全层微观组织结构TiAl基合金断裂机理的影响

发布时间：2018-06-21 16:19

本文选题：三点弯曲 + TiAl基合金　；参考：《热加工工艺》2015年24期

【摘要】：通过三点弯曲试验和扫描电镜(SEM)断口观察研究了位移速率对具有全层微观组织结构TiAl基合金断裂韧性及断裂机理的影响。结果表明:全层组织断裂韧性随位移速率的提高而增加,全层组织试样断裂机理呈扩展控制的特征,在较高的载荷速率加载时,试样的原始缺口起主导作用,主裂纹可沿正应力最大的方向,选取直接快速的穿层方式扩展;而在较低位移速率加载时,主裂纹扩展时有足够时间沿结合能较低的层面扩展。
[Abstract]:The effect of displacement rate on fracture toughness and fracture mechanism of TiAl-based alloy with full-layer microstructure was studied by means of three-point bending test and SEM (SEM) fracture. The results show that the fracture toughness of the whole layer increases with the increase of the displacement rate, and the fracture mechanism of the whole layer is controlled by expansion. When the loading rate is high, the original notch of the specimen plays a leading role. The main crack can be propagated directly and rapidly along the direction of the maximum normal stress, and when loading at lower displacement rate, there is sufficient time for the main crack to propagate along the plane with lower binding energy.
【作者单位】：辽宁石油化工大学机械工程学院;兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室;
【基金】：辽宁省博士基金(20131062)
【分类号】：TG115

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