摘要
一种新型的非晶形成能力的判据被成功应用于激光熔覆非晶领域,即e/a比例(平均原子价电子数)与Ra(平均原子尺寸)的判据。使用CO2激光器在碳钢表面熔覆了Zr63.8Ni17.2Al11.4Cu7.6与Zr65Ni10Al7.5Cu17.5粉末,并对熔覆层微观结构、相组成、显微硬度与腐蚀性能进行了研究。结果表明,熔覆层由晶体、非晶体组成,出现了一定量的氧化物与金属间化合物。Zr63.8Ni17.2Al11.4Cu7.6在熔覆中确实较传统的Zr65Ni10Al7.5Cu17.5体系具有更强的非晶形成能力,利于非晶涂层的制备。显微硬度明显提高,熔覆层中部的硬度是基材的3倍。耐腐蚀性能得到一定改善,虽腐蚀倾向上升但整体腐蚀程度得以下降。
A new glass forming ability(GFA) criterion,i.e.optimum e/a ratio(average valence electron number per atom) and Ra(average atomic size) was successfully applied in the laser cladding of amorphous alloy.The laser cladding of Zr63.8Ni17.2Al11.4Cu7.6powder was conducted on carbon steel using a powder bed method compared with that of Zr65Ni10Al7.5Cu17.5 powder.The microstructure,phase composition,microhardness and corrosion resistance of the coatings were analyzed.The results show that the coatings have a complex microstructure and mainly consist of amorphous phase,metallic oxide phase and intermetallic phase.Zr63.8Ni17.2Al11.4Cu7.6 has a better glass forming ability than that of the well-known Inoue's Zr65Ni10Al7.5Cu17.5 alloy in cladding process.The microhardness of the coating is greatly improved,with the hardness of the middle layer three times higher of the substrate.In addition,the corrosion resistance was enhanced making the corrosion severity declined to a certain extent.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第S2期64-67,共4页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(51075293)
关键词
激光熔覆
非晶
锆基合金
碳钢
laser cladding
amorphous
Zr-based alloy
carbon steel
