首页|时效前预拉伸处理对TiB2/7056复合材料组织与性能的影响

时效前预拉伸处理对TiB2/7056复合材料组织与性能的影响

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采取扫描电镜、透射电镜等显微组织表征方法并结合室温拉伸、室温摆锤冲击实验和应力腐蚀等测试手段，研究时效前预拉伸处理对TiB2/7056复合材料组织与性能的影响。研究结果表明:随着时效前预拉伸量增加，TiB2/7056复合材料的位错密度显著增加，经时效热处理后的晶内析出相直径增大，晶界析出相形貌由链状转变为粗大不连续状，无沉淀析出带宽化;TiB2/7056复合材料的强度先增大后减小，冲击韧性能与延伸率降低;与无预拉伸相比，预拉伸的TiB2/7056复合材料的应力腐蚀抗力显著提升(扩展速率降低1个量级)，其主要原因是不连续粗大的晶界析出相阻断了应力腐蚀裂纹的扩展。
Effect of pre-stretching treatment on microstructure and properties of TiB2/7056 composites
The microstructure and properties of TiB2/7056 composites with pre-stretching treatments prior to aging heat treatment were investigated by scanning electron microscopy,and transmission electron microscope combined with room temperature mechanical,Charpy impact and stress corrosion methods.The results show that the dislocation density of TiB2/7056 composites increases significantly when the degree of pre-stretching before aging increases,the diameter of the intragranular precipitated phase after aging heat treatment increases,and the morphology of the precipitated phase at the grain boundaries transformes from a chain-like shape to a coarse discontinuous shape,with no precipitation precipitation band broadening.The strength of TiB2/7056 composite first increases and then decreases while the impact toughness and elongation decrease.Especially,the stress corrosion resistance of TiB2/7056 composite is significantly improved after pre-stretching(the propagation rate decreases by one order of magnitude).The reason is that precipitating the discontinuous coarse grain boundary inhibites the expansion of stress corrosion crack.

TiB2 aluminum matrix composites7056 aluminum alloypre-stretchingmicrostructurestress corrosion

郭子龙、王邓彪、陈送义、蒋日鹏、李昉、陈庚、张晨、陈康华

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中南大学极端服役性能精准制造全国重点实验室,湖南长沙,410083

中南大学轻合金研究院,湖南长沙,410083

中南大学粉末冶金研究院,湖南长沙,410083

TiB2铝基复合材料 7056铝合金 预拉伸 显微组织 应力腐蚀

极端服役性能精准制造全国重点实验室自主课题湖南省自然科学基金资助项目国家重点研发计划项目State Key Laboratory of Precision Manufacturing for Extreme Service PerformanceNatural Science Foundation of Hunan Province

ZZYJKT2020-032023JJ06682021YFF0600504

2024

10.11817/j.issn.1672-7207.2024.08.020

中南大学学报(自然科学版)
中南大学

中南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.938
ISSN：1672-7207
年,卷(期)：2024.55(8)