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激光熔覆Zr₆₅Al_7.5Ni₁₀Cu_17.5非晶纳米晶复合涂层组织结构

Microstructure of Zr₆₅Al_7.5Ni₁₀Cu_17.5 composite coatings produced from amorphous and nano-crystal by laser cladding

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【Author】 LI Gang1,ZHANG Weiqiang1,HAO Shengzhi2(1 Liaoning Technical University,Fuxin 123000,Liaoning,China;2 State Key Lab for Materials Modification by Laser,Ion,and Electron Beams,Dalian University of Technology,Dalian 116023,Liaoning,China)

【机构】辽宁工程技术大学；大连理工大学三束材料改性国家重点实验室辽宁阜新123000；辽宁阜新123000；辽宁大连116023；

【摘要】在Ti基体上激光熔覆Zr65Al7.5Ni10Cu17.5合金粉末,得到含非晶、纳米晶复合涂层。分析表明涂层由金属间化合物和非晶、纳米晶构成。涂层按组织形貌分为3层:表面枝晶区、中部细晶区和结合区枝晶区。金属间化合物为Al2Zr3、CuZr2和Zr2Ni,纳米晶为简单四方Al2Zr3相,晶格常数为:a=b=7.618 nm,c=6.985 nm。更多还原

【Abstract】 Zr65Al7.5Ni10Cu17.5 composite coatings on Ti substrate were produced by laser cladding.The microstructure of the coating was investigated by means of SEM,TEM and XRD.The results showed that the coatings mainly consisted of intermetallic phases,amorphous phase and nanocrystalline phase,of which the intermetallic phases were Al2Zr3,CuZr2 and Zr2Ni,and the nanocrystalline phase was Al2Zr3 with P42 structure,whose cell parameters were a=b=7.618 nm,c=6.985 nm.The coating could be divided into three layers according to the difference of microstructure morphology,viz,dendrite zone on the surface,fine crystalline zone in the middle,and bonding zone.更多还原