摘要
研究了新型高强度铸造耐磨合金Zn 5 0 %Al的断裂与疲劳性能。结果表明,铸态Zn 5 0 %Al合金,比ZA2 7合金有更高的疲劳强度和断裂韧性,疲劳裂纹的萌生大部分在表层的缺陷处,极少数在晶界及表面滑移而形成的变形处,疲劳裂纹以穿晶形式扩展,静态断裂裂纹的扩展是在枝晶间的共析体中进行,α相具有阻碍裂纹扩展的作用。
Fatigue and fracture properties of a new type high strength abrasion-resisting Zn-50% Al cast alloy (ZA50) were studied. The results show that fatigue strength and fracture toughness of ZA50 alloy are higher than that of ZA27 alloy under same casting condition. Most of fatigue cracks initiate at the defects in the surface layers, and a few of them on the grain boundary or surface slip band. Fatigue cracks propagate transgranularly, the static cracks propagate in the eutectoids among the dendrites, α phase can impede crack extension.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2005年第2期78-81,共4页
Transactions of Materials and Heat Treatment
关键词
铸造Zn-50%Al合金
疲劳强度
断裂韧性
裂纹扩展速率
Aluminum alloys
Casting
Crack initiation
Fatigue of materials
Fracture toughness
Microstructure
Optical microscopy
Scanning electron microscopy
Zinc alloys
