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材料工程  2013 

全片层与双态组织高铌TiAl合金高温原位拉伸研究

DOI: 10.3969/j.issn.1001-4381.2013.09.016

Keywords: 高铌TiAl合金,全片层组织,双态组织,原位拉伸

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Abstract:

利用原位观察的方法研究了全片层(FullyLamellar,FL)组织与双态(Duplex,DP)组织高铌TiAl合金在750℃下的拉伸力学行为。结果表明DP组织具有较好的抗拉强度和塑性,其抗拉强度为958MPa,断面收缩率为45.1%,FL组织抗拉强度较低且几乎没有塑性;随着拉伸应力的增加,DP组织合金试样表面存在一个大量裂纹萌生和扩展的过程,这些裂纹均匀分布在试样表面,主要以萌生为主,几乎难以扩展,而在FL组织中只能观察到少量的裂纹萌生现象;拉伸断裂后的DP组织合金的裂纹是由多个孔洞合并而成,呈蠕虫状且尺寸很小,FL组织中与拉伸方向垂直或呈一较大夹角的片层团界及片层界较易萌生裂纹,在临近断口区域,裂纹主要以穿层扩展为主。

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