Effect of heat treatment on microstructure and properties of hot-extruded nickel-aluminum bronze

摘要：

The effect of heat treatment on the microstructure and properties of a hot-extruded nickel-aluminum bronze was investigated.Experimental materials were heat treated through different processes,including quenching,normalizing,aging and annealing,and their microstructure,corrosion resistance and mechanical properties were characterized.It is found that quenching causes all β phase transformed into β′ phase,however,normalizing causes β phase transformed into β′,α and κ phases.When the quenched sample is aged,fine к phase is precipitated from the as-quenched microstructure of β′ phase.Annealing causes the transformation of β′ into α and к phases.The results of mechanical property tests show that quenching,normalizing and aging improve the tensile strength and hardness of the experimental material,with a corresponding fall in elongation.Annealing raises the elongation but reduces the tensile strength and hardness.Furthermore,corrosion resistance of nickel-aluminum bronze ranks from worse to better in the following order: aged,quenched,normalized,hot-extruded and annealed.However,with the exposure time of corrosion test increasing,the difference of average corrosion rate between those nickel-aluminum bronzes turns small.

关键词： nickel-aluminum bronze heat treatment microstructure mechanical property corrosion resistance

作者: CHEN Rui-ping LIANG Ze-qin ZHANG Wei-wen ZHANG Da-tong LUO Zong-qiang LI Yuan-yuan

作者单位: School of Mechanical Engineering,South China University of Technology,Guangzhou 510640,China

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）