利用爆炸焊及电子束焊接方法制备了含不同厚度中间纯铝层的LYl2/Al/LY12四点弯曲试样,并在纯铝层中预制了平行于界面的疲劳裂纹加载后裂纹尖端侧剖形貌的金相观察和对应断口表面的微区成分的能谱分析均确认了裂纹在纯铝层内的扩展.实验结果表明:在双界面强约束下,随着中间纯铝层厚度的减小,所测定的预裂纹试样的载荷/位移曲线表现出明显的差异;以其临界J积分表征的断裂韧性值显著降低,即纯铝层发生了韧脆转变;试样断口表面出现局部准解理花样等脆化特征,其所占比例逐渐增加;对这种约束下纯铝韧脆转变的微观机理进行了初步的探讨.
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