Abstract
在以往超重力场合成梯度材料的基础上，制备出组分含量TiB2-TiC-Fe呈连续梯度变化的TiB2基陶瓷/42CrMo合金梯度材料. 对材料进行XRD，SEM，硬度测试以及三点弯曲强度测试，并采用电测法获取陶瓷基体部分的弹性模量，并在此基础上，对中间过渡区的弹性模量进行拟合，最后再采用解析方法计算梯度材料的应力应变分布. 结果表明，TiB2基陶瓷/42CrMo合金相界呈连续梯度变化，硬度自陶瓷顶部至合金底部呈梯度递减.三点弯曲测试发现TiB2基陶瓷/42CrMo合金材料具有类似于金属的塑性变形特征，从而出现明显的失效延迟行为. 采用电测法得出纯陶瓷组分的弹性模量约为560 GPa，参数拟合得出中间过渡区的弹性模量变化形式更趋近于三角函数，计算得出的应力表示自金属底部出现损伤，而后裂纹向陶瓷顶部方向扩展，与该材料试验现象契合.
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