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OBSERVATION OF EPITAXIAL OVERLAYER OF METALS AT ATOMIC LEVEL
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作者 T.T.TSONG 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1989年第4期231-236,共6页
Observation of epitaxial overlayer of metals at atomic level has been successfully observed in field ion microscope with 5 ns pulsed-laser heating.The condition of superlattice layer growth depends on the surface free... Observation of epitaxial overlayer of metals at atomic level has been successfully observed in field ion microscope with 5 ns pulsed-laser heating.The condition of superlattice layer growth depends on the surface free energy and the lattice misfit.Many defects,such as vacancies,va- cancy clusters,voids,dislocations and twins are produced during epitaxial growth because of the lattice misfit even though the condition of surface free energy is satisfied.Alloying is ob- served to occur on the surface of the metal during the epitaxial growth.Diffusion is probably via the exchange mechanism. 展开更多
关键词 field ion microscope epitaxial growth crystal defect diffusion mechanism SUPERLATTICE
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PRECIPITATION HARDENING OF ELINVAR ALLOY
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作者 LIU Zhiguo CHEN Yong CAO Yanni Nanjing University,Nanjing,ChinaZHU Zhengsheng Shaanxi Iron and Steel Institute,Xi’an,China Professor,Dept.of Physics,Nanjing,University,Nanjing 210008,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1991年第1期33-36,共4页
The microstructural evolution and precipitation hardening of an Elinvar alloy doped with Ti and Al during isothermal aging at 700℃ have been investigated by atom probe field ion microscopy and microhardness measureme... The microstructural evolution and precipitation hardening of an Elinvar alloy doped with Ti and Al during isothermal aging at 700℃ have been investigated by atom probe field ion microscopy and microhardness measurements.The γ′ precipiates are spherical and coherent with the matrix.The chemical composition of the precipitates are(Ni_(0.53)Fe_(0.47)_3 (Ti_(0.(?))Al_(0.4)). During aging,a Lifshitz-Wagner type dissolution and coarsening reaction of the precipitates has been observed,The hardness of the material varies with the aging time and reaches maxi- mum when the average diameter of the precipitates was about 11 nm. 展开更多
关键词 Elinvar alloy atom probe field ion microscope γ-phase precipitation hardening atom probe selected area analysis
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