首页>
中文期刊>
《中国科学
》
>The electronic structure and grain boundary segregation by boron addition——A binding energy shifting criterion for the brittle-ductile fracture transition in Ni3Al
The electronic structure and grain boundary segregation by boron addition——A binding energy shifting criterion for the brittle-ductile fracture transition in Ni3Al
The electronic structure and grain boundary segregation caused by boron addition to Ni3Al have been studied by X-ray photoelectron spectroscopy and Auger electron spectroscopy, respectively. The obtained results show that the Ni2p3/2 electron binding energy rises gradually in the sequence of pure Ni Ni76Al24 Ni74Al26 Ni25Al25, while it reduces monotonously with an increase in boron addition to Ni3Al. Besides, it is found that the gram boundary segregation of boron occurring in Ni3Al is a combined equilibrium and non-equilibrium type in nature. Based on the concept of the bonding environmental inhomogeneity, measured by the shift in Ni2p3/2 electron binding energy from the nickel atoms in the simple substance nickel to those in the intermetallic compound Ni3Al (ΔEB), being responsible for the brittle behavior of the alloy, a binding energy shifting criterion for the brittle-ductile fracture transition in Ni3Al is presented: when ΔEB0, the brittle failure occurs in Ni3Al; when ΔEB0, the ductile o
展开▼
机译:在意大利的流行病学e monitoraggio alcol-correlato。 Valutazione dell'Osservatorio Nazionale alcol-CNEsps sull'impatto dell'uso e abuso di alcol ai fini dell'implementazione delle attivita del piano Nazionale alcol e salute。 2010年报告。(意大利的流行病学和酒精相关监测。国家酒精评估 - CNEsps关于使用和滥用酒精对支持实施国家酒精和健康计划活动的影响。2010年报告)