Fatigue-Strength Enhancement of Cast Zr50Cu40Al10 Glassy Alloys
Fatigue-Strength Enhancement of Cast Zr50Cu40Al10 Glassy Alloys
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DOI：
10.2320/matertrans.47.1286
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发表时间：
2006-05
影响因子：
1.2
通讯作者：
Y. Yokoyama;P. Liaw;M. Nishijima;K. Hiraga;R. Buchanan;A. Inoue
中科院分区：
文献类型：
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作者：
Y. Yokoyama;P. Liaw;M. Nishijima;K. Hiraga;R. Buchanan;A. Inoue
为了提高Zr 50 Cu 40 Al 10 BGAs在103 ~ 104次循环中的疲劳强度，我们尝试使用少量添加元素。因此，Pd。Ag、Pt、Au是提高合金疲劳强度的有效添加元素。特别是Pd元素的添加对材料的疲劳强度有显著的增强作用。Pd元素的加入促进了玻璃结构的膨胀，这可以从结构松弛引起的体积变化中看出。因此，我们发现Zr 50 Cu 40-X Al 10 Pd X [X: 0-7原子百分比（at%）]玻璃合金的疲劳极限与体积变化呈线性关系。此外，我们认为疲劳断口表面独特的硬度分布可能与氢硬化有关。Zr 50 Cu 37 Al 10 Pd 3玻璃态合金具有较好的抗氢硬化能力，其最高疲劳极限为1050 MPa。因此，保持氢对疲劳裂纹尖端的硬化和脆化的平衡是提高疲劳强度的重要因素。
In order to improve the fatigue strength of Zr 50 Cu 40 Al 10 BGAs during 10 3 -10 4 cycles, we tried to use the small additive element. As a result, Pd. Ag, Pt, and Au are effective addition elements to enhance the fatigue strength. Especially, the additive Pd element has a beneficial effect on the fatigue-strength enhancement. The additive Pd element promotes the glass-structure expansion, which can be recognized from the volume change due to the structural relaxation. Consequently, we found the linear relationship between the fatigue limit and volume change in Zr 50 Cu 40-X Al 10 Pd X [X: 0-7 atomic percent (at%)] glassy alloys. Furthermore, we conclude that the origin of the unique hardness distribution on the fatigue-fractured surface is probably related to hydrogen hardening. The Zr 50 Cu 37 Al 10 Pd 3 glassy alloy, which exhibits the highest fatigue limit of 1,050 MPa, shows a superior resistance force against the hydrogen hardening. Thus, maintaining the balance between the hardening and embrittlement around the fatigue crack tip by hydrogen is the significant factor to enhance the fatigue strengths.