MECHANICAL PROPERTIES OF NiAl-TiB 2 COMPOSITE MATERIALS
MECHANICAL PROPERTIES OF NiAl-TiB 2 COMPOSITE MATERIALS
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NiAl-TiB 2 复合材料的力学性能
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Masashi Yoshida
中科院分区：
文献类型：
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作者：
Masashi Yoshida
采用放电等离子烧结在 1573K 温度下制备了铝化镍和二硼化钛复合材料。研究了弯曲强度、维氏硬度和压痕断裂韧性的成分依赖性。 NiAl的弯曲强度随着TiB2的添加量达到20vol%而迅速增加，并随着添加量的增加而逐渐下降。弯曲强度的这种成分依赖性可以基于基体相的晶粒细化和从基体到增强颗粒的应力传递的强化机制来解释。维氏硬度随着TiB2含量的增加而增加，NiAl-78vol%TiB2的维氏硬度最高达到1600Hv。通过SEM观察，在TiB2含量超过56vol％的复合材料中观察到压痕裂纹。 NiAl-56vol%TiB2的断裂韧性为22MPa·m，NiAl-78vol%TiB2的断裂韧性下降到15MPa·m。据推测，断裂韧性的降低与弯曲强度的降低有关。
Composite materials of nickel aluminide and titanium diboride were fabricated using spark plasma sintering at 1573K. Composition dependence of the bending strength, Vickers hardness and the indentation fracture toughness were investigated. The bending strength of NiAl increased rapidly with the addition of TiB2 up to 20vol% and decreased gradually by the further addition. This composition dependence of the bending strength was explained on the basis of the strengthening mechanisms due to grain refining of the matrix phase and stress transfer from the matrix to the reinforcement particles. The Vickers hardness increased with the amount of TiB2 and the highest value of 1600Hv was obtained for NiAl-78vol%TiB2. By the SEM observation, indentation cracks were observed in the composites containing TiB2 more than 56vol%. The fracture toughness of NiAl-56vol%TiB2 was 22MPa・m , which decreased to 15 MPa・m of NiAl-78vol%TiB2. It is conjectured that the decrease of the fracture toughness is related with the decrease of the bending strength.