Statistical description of the effect of Zr addition on the behavior of microcracks in Cu–6Ni–2Mn–2Sn–2Al Alloy
Statistical description of the effect of Zr addition on the behavior of microcracks in Cu–6Ni–2Mn–2Sn–2Al Alloy
复制标题
Zr添加对Cu-6Ni-2Mn-2Sn-2Al合金微裂纹行为影响的统计描述
DOI：
10.1007/s10853-011-5935-4
复制
发表时间：
2012
影响因子：
4.5
通讯作者：
Kusno Kamil
中科院分区：
文献类型：
--
作者：
M. Goto;Seung;K. Euh;N. Kawagoishi;Sangshik Kim;Kusno Kamil
作为高强度Cu-Be合金的可能替代品，Cu-6Ni-2Mn-2Sn-2Al合金已被开发出来。为了弄清微量Zr对此类合金疲劳强度影响的物理背景，对导致试样断裂的主裂纹的萌生和扩展行为进行了监测。当应力幅值< σa= 350 MPa时，含Zr合金的疲劳寿命约为不含Zr合金的2 ~ 2.5倍。当σa>为350 MPa时，Zr的加入对疲劳寿命的影响随着应力幅值的增大而显著减小。Zr的加入提高了疲劳寿命，主要是由于裂纹萌生寿命和微裂纹扩展寿命的提高。裂纹萌生寿命的延长主要是由于SnZr化合物的析出强化了晶界。对多裂纹的疲劳行为进行了统计分析，定量评价了疲劳行为的离散性。统计分析支持从一个大裂纹的行为得出的结论。
As possible substitutes for high-strength Cu–Be alloys, Cu–6Ni–2Mn–2Sn–2Al alloys have been developed. To clarify the physical background of the effect of trace Zr on the fatigue strength of such alloys, the initiation and propagation behavior of a major crack that led to the fracture of the tested specimens was monitored. When the stress amplitude was less thanσa= 350 MPa, the fatigue life of the alloys with Zr was about 2–2.5 times larger than that of the alloy without Zr. Whenσa> 350 MPa, the effect of Zr addition on the fatigue life dramatically decreases as the stress amplitude increases. The increased fatigue life due to Zr addition resulted from an enhancement of the crack initiation life and microcrack growth life. The enhanced crack initiation life was mainly attributed to the strengthening of grain boundaries due to the precipitation of SnZr compounds. A statistical analysis of the behavior of multiple cracks was made to quantitatively evaluate the scatter in fatigue behavior. The statistical analysis supported the conclusions obtained from the behavior of a major crack.