Effect of Ni addition on fatigue properties of bulk glassy Zr50Cu40Al10 alloys

被引：32
|
作者：
Yokoyama, Y [1 ]
Fukaura, K
Inoue, A
机构：
[1] Himeji Inst Technol, Fac Engn, Himeji, Hyogo 6712201, Japan
[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
来源：
MATERIALS TRANSACTIONS | 2004年 / 45卷 / 05期
关键词：
Zr50Cu40Al10 and Zr(50)Cu(30)Ni(10)Al(10)BGAs; Wohler curve; fatigue limit; striation-like mark; French's damage curve; surface oxidization;
D O I：
10.2320/matertrans.45.1672
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We examined Wohler curves of Zr50Cu40Al10 and Zr50Cu30Ni10Al10 bulk glassy alloys (BGAs) using a rotating-beam fatigue test to evaluate the effect of addition Ni on fatigue strength. As a result, we found that the fatigue limit was increased from 250 MPa to 500 MPa by adding 10at% Ni instead of Cu to a Zr50Cu40Al10 BGA. Zr50Cu40Al10 BGAs exhibit wider fatigue-fractured region with striation-like marks than that of Zr50Cu30Ni10Al10 BGAs. Additive Ni element limits the fatigue-fractured region to half of the whole fractured surface. We also measured dimensions of fatigue-fracture area of Zr50Cu40Al10 and Zr50Cu30Ni10Al10 BGAs to estimate the value of fatigue-fracture toughness. Especially, the fatigue fracture toughness decreases suddenly around 10(3)similar to10(4) cycles, similar to the Wohler curves. The significant decrease of fatigue-fracture toughness originates from embrittlement/hardening in front of the fatigue crack tip during fatigue test.
引用
收藏
页码：1672 / 1678
页数：7
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