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TiAl/NiCoCrAl层板复合材料的EB-PVD制备及组织性能研究
  • 期刊名称：航空材料学报. 2008, 28(1): 30-34
  • 时间：0
  • 分类：TG146.2[金属学及工艺—金属材料;一般工业技术—材料科学与工程;金属学及工艺—金属学]
  • 作者机构：[1]哈尔滨工业大学复合材料与结构研究所,哈尔滨150080, [2]北京航空制造工程研究所高能束流加工技术国防科技重点实验室,北京100024
  • 相关基金：国家自然科学基金项目（90405016）;黑龙江省科技攻关项目（QC06C039）
  • 相关项目：空天飞行器材料与结构的性能评价及关键理论研究
关键词： TiAl/NiCoCrAl, 层板复合材料, 电子束物理气相沉积, 组织与性能, 强韧化, TiAl/NiCoCrAl, multilayer composites, EB-PVD, structure and properties, strengthening and toughening mechanism
中文摘要：

采用电子束物理气相沉积（EB-PVD）技术,成功制备了尺寸为150mm×100mm×0.4mm的TiAl/NiCoCrAl层板复合材料,并对其物相组成、断口形貌和室温力学性能与TiAl单层材料进行了对比分析。结果表明,在TiAl/NiCoCrAl层板复合材料中,NiCoCrAl层主要由Ni3Al和NiCrCo组成,TiAl层由γ相、α2相和τ相组成且未发现TiAl单层材料中看到的分层现象;TiAl/NiCoCrAl层板复合材料的强度和韧性都要高于TiAl单层材料,其断裂方式由沿晶脆性断裂转变为具有一定延性的穿晶断裂和沿晶断裂的混合断裂方式。TiAl/NiCoCrAl层板复合材料的强化机制主要为细晶弥散强化;该材料的韧化机制主要为裂纹的偏转、微桥接和弯曲增韧。

英文摘要：

TiAl/NiCoCrAl multilayer composites with 150mm 100ram 0.4mm were fabricated successfully by EB-PVD process. The phase composition, fracture morphology and mechanical properties of TiAl/NiCoCrAl multilayer composites were compared with that of one-layer TiAl alloys. The results indicate that NiCoCrAl layer of TiAl/NiCoCrAl multilayer composites mainly consist of Ni3 Al and NiCrCo, and the TiAl layer is composed of γ, α2 and τ phase, but no delamination existed in the one-layer Ti-Al alloys is found. TiAl/ NiCoCrAl multilayer composites have higher bending strength and better ductility than one-layer TiAl alloys. Compared with the TiAl- based alloys sheet, the fractures of the TiAl/NiCoCrAl multilayer composites are diverted from the manner of brittle intergranular fracture to the mixed manner of brittle intergranular fracture with some ductile transcrystalline fracture. The strengthening mechanisms of the TiAl/NiCoCrAl multilayer composites are the fine grained dispersion strengthening, and the toughening mechanisms are the crack deflection, the micro bridge join and the crack bend toughening.

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空天飞行器材料与结构的性能评价及关键理论研究
期刊论文 135 会议论文 11
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