Microstructure and mechanical properties of ZrO2/NiCr functionally graded materials

Microstructure and mechanical properties of ZrO2/NiCr functionally graded materials
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ZrO2/NiCr功能梯度材料的显微组织和力学性能

DOI:
10.1016/j.msea.2009.01.066
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发表时间:
2009-05
影响因子:
6.4
通讯作者:
Wu, Linzhi
Wu, Linzhi
中科院分区:
材料科学1区
文献类型:
--
作者:
Sun, Yuguo;Jin, Xin;Guo, Licheng;Wu, Linzhi

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对粉末冶金制备的 ZrO2/NiCr 功能梯度材料 (FGM) 的微观结构和力学性能进行了实验研究。显微镜检查表明 FGM 的材料成分和微观结构逐渐变化。 FGM 的机械性能分布是通过对具有不同 ZrO2 体积分数的均质复合材料样品(非 FGM)进行机械测试而获得的。实验结果表明,机械性能的分布很大程度上取决于微观结构的变化。研究发现,随着ZrO2含量的增加,硬度增加,延展性降低,这是由于基体相从金属到陶瓷的变化所致。当ZrO2的体积分数从0%增加到40%时,弯曲强度和弹性模量下降;而当ZrO2的体积分数从50%增加到100%时,弯曲强度和弹性模量则增加。这些主要是由陶瓷/金属界面结合弱造成的。
The microstructure and mechanical properties of ZrO2/NiCr functionally graded materials (FGMs) fabricated by powder metallurgy are investigated experimentally. Microscopic examination exhibits that the material composition and microstructure of the FGMs vary gradually. The distributions of mechanical properties in the FGMs are obtained from the mechanical testing of homogeneous composite samples (non-FGM) with different volume fractions of ZrO2. The experimental results show that the distributions of mechanical properties strongly depend on the variation of microstructure. It is found that hardness increases and ductility decreases with the increase of ZrO2, which is attributed to the variation of the matrix phase from the metal to the ceramic. Bending strength and elastic modulus decrease as the volume fraction of ZrO2increase from 0% to 40%, however, increase as the volume fraction of ZrO2increase from 50% to 100%. These are mainly caused by the weakly bonded ceramic/metal interface.
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