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根据余氏理论提出了一个价电子结构多数－均匀变形因子α，分析了Ｔｉ－Ａｌ及Ｆｅ－Ａｌ系金属间化合物的价电子结构，并计算了α值，得到了与实验规律一致的结果，从而解释了其脆性本质。
According to Yu’s theory, a valence electron structure majority-uniform deformation factor α was proposed. The valence electron structures of Ti-Al and Fe-Al intermetallic compounds were analyzed and the α value was calculated. The results were consistent with the experimental results. Thus explaining its fragility nature.