Layered structure of Ni-Al multi-layered metal-intermetallic composites fabricated by in-situ react

• 作 者: 张佼 孙宝德 夏振海
• 机 构: State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, Shanghai 200030, Chi
• 出 处: Transactions of Nonferrous Metals Society of China
• 发表日期: 2004年06期
• 关键词: intermetallic layered NiAl holds

Systematical experiments were done at five temperature levels: (500 ℃,) (630 ℃,) (900 ℃,) (1 000 ℃) and (1 100 ℃) to illuminate the layer structure of the multi-layered metal-intermetallic composites of Ni-Al system that were fabricated by a previously reported simple and cost-effective method. The analysis of back scattering photos and XRD examination of specimens reveal that the look like single compound layer is composed of several different components. The primary phase produced during reaction is Ni_2Al_3 and there exists a like two-phase field between NiAl_3 and Ni_2Al_3. The high temperature phases like NiAl and Ni_3Al are also found at low temperature. The results indicate that the key driving force of in-situ reaction is not temperature, but the atom concentration.

Systematical experiments were done at five temperature levels: (630 ° C, 900 ° C, 1000 ° C) and (1 100 ° C) to illuminate the layer structure of the multi-layered metal-intermetallic composites of The analysis of back scattering photos and XRD examination of specimens reveal that the look like single compound layer is composed of several different components. The primary phase produced during reaction is Ni_2Al_3 and there exists a like two-phase field between NiAl_3 and Ni_2Al_3. The high temperature phases like NiAl and Ni_3Al are also found at low temperature. The results said that the key driving force of in-situ reaction is not temperature, but the atom concentration.