Mechanical properties and deformation behavior of laminated Ni-(Ni2Al3+NiAl3) and Ni-(Ni3Al+NiAl) composites
Mechanical properties and deformation behavior of laminated Ni-(Ni2Al3+NiAl3) and Ni-(Ni3Al+NiAl) composites
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DOI：
10.1016/j.msea.2013.08.002
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发表时间：
2013-12
期刊：
影响因子：
6.4
通讯作者：
M. Konieczny
中科院分区：
文献类型：
--
作者：
M. Konieczny
用0.40mm厚的Ni片和0.08或0.15mm厚的Al箔在真空中反应合成了Ni-（Ni 2Al 3 + NiAl 3）和Ni-（Ni 3Al +NiAl）叠层复合材料。由于金属间化合物的形成，铝层被完全消耗。结果表明，由于复合材料的结构只与热处理时间和温度有关，因此易于设计。在620 °C下反应2 h得到由Ni和Ni 2Al 3 + NiAl 3层组成的显微组织。在620 °C下热处理2小时，然后在1150 °C下热处理4小时，得到包含Ni和Ni 3Al +NiAl层的复合材料。对具有不同微观结构的材料进行压缩强度、弯曲强度和冲击韧性测量，以确定它们的机械性能和变形行为。结果表明，金属间化合物层的成分是决定性能的主要因素。Ni-（Ni 3Al +NiAl）复合材料的力学性能普遍高于Ni-（Ni 2Al 3 + NiAl 3）复合材料。Ni-（Ni_2Al_3 + NiAl_3）层板的断裂行为表现为金属间化合物的脆性断裂和Ni层的韧性断裂的混合。Ni-（Ni_3Al +NiAl）叠层复合材料表现出不同的行为。观察到非灾难性断裂是由于沿含有Al 2 O3夹杂物的Ni 3Al/Ni 3Al界面沿着的微脱粘所致。在测试期间，Ni 3Al层与Ni层协同变形。结果表明，Ni-（Ni 3Al +NiAl）复合材料的行为类似于韧性合金，并表现出相当大的应变硬化。
The Ni-(Ni2Al3+NiAl3) and Ni-(Ni3Al+NiAl) laminated composites have been fabricated by reaction synthesis in vacuum using 0.40 mm thick Ni sheets and 0.08 or 0.15 mm thick Al foils. The aluminum layers were completely consumed owing to the formation of intermetallics. It was shown that the composites could be easily designed because the structures of the composites depended only on the treating time and temperature. Reaction synthesis at 620 °C for 2 h resulted in a microstructure consisting of Ni and Ni2Al3+NiAl3layers. Heat treatment at 620 °C for 2 h and then at 1150 °C for 4 h resulted in composites comprising Ni and Ni3Al+NiAl layers. Compressive strength, flexural strength and impact toughness measurements were performed on the materials with different microstructures to establish their mechanical properties and deformation behavior. The results showed that the composition of intermetallic layers was the main factor determining properties. The Ni-(Ni3Al+NiAl) composites generally had higher mechanical properties than the Ni-(Ni2Al3+NiAl3) composites. The fracture behavior of the Ni-(Ni2Al3+NiAl3) laminates in all accomplished tests exhibited a mixture of brittle transverse cracking of intermetallics and ductile one of Ni layers. The Ni-(Ni3Al+NiAl) laminated composites behaved different. A non-catastrophic fracture was observed due to the micro-debonding along the Ni3Al/Ni3Al interfaces containing inclusions of Al2O3. The Ni3Al layers co-operatively deformed with the Ni layers during testing. As a result, the Ni-(Ni3Al+NiAl) composites behaved like a ductile alloy and exhibited considerable strain-hardening.