摘要
通过SEM和TEM观察发现:喷射沉积制备的Zn-38Al-2Cu合金沉积坯具有细小均匀的微观组织结构,无严重偏析,结合XRD分析可知,合金组成主要为类片状珠光体的α+η片层状共析组织以及少量弥散分布的纳米级富铜ε相沉淀颗粒。通过挤压和热处理工艺,可以完全消除沉积过程中形成的大量孔洞,显著改善合金的力学性能。摩擦实验发现,Zn-38Al-2Cu合金的摩擦系数随着摩擦荷载的增加而减小,随着摩擦速度的增大而增大。当荷载较低时,主要呈现犁削磨损;而荷载较大时,碾压磨损和粘着磨损占主导地位。与普通铸造态合金相比,喷射沉积+挤压+热处理大大提高了合金的耐磨性能。
In this paper, one ternary zinc-aluminium-copper alloy was prepared by spray forming and its microstructure and wear properties were studied by using OM, SEM, TEM, and MM-200 wear testing machine. The microstructure is composed of fine lamellar eutectoid and the grains are fine and uniform. Tensile strength, hardness and elongation of the spray formed Zn-38Al-2Cu alloy are all improved compared to the as-cast counterpart while the spray formed ＋ extruded ＋ heat-treated alloy has the best comprehensive properties. It is found that friction coefficient of the alloy decrease as pressure increasing, and the＇velocity has the reverse trend. With a lower pressure, abrasion appears to be an effective wear mechanism while adhesion and smearing abrasion dominate the wear behavior as the pressure increasing.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2009年第1期6-10,28,共6页
Powder Metallurgy Technology
基金
上海市科委资助项目(05nm05028)
关键词
喷射沉积
共析组织
力学性能
摩擦磨损
spray forming
eutectoid microstructure
mechanical properties
wear properties
