当前位置: X-MOL 学术Mater. Sci. Eng. A › 论文详情
Effect of constraint factor on the thermo-mechanical fatigue behavior of an Al-Si eutectic alloy
Materials Science and Engineering: A ( IF 4.081 ) Pub Date : 2020-03-23 , DOI: 10.1016/j.msea.2020.139279
M. Wang; J.C. Pang; H.Q. Liu; S.X. Li; M.X. Zhang; Z.F. Zhang

The thermo-mechanical fatigue (TMF) behaviors and corresponding damage mechanisms of Al-Si piston alloy were investigated in the temperature range of 120∼425 °C under different constraint factors (η). The TMF hysteresis loops exhibit asymmetrical, because the yield strength and elastic modulus decrease significantly with the increasing temperature. Taking the phase angles into consideration, the mean tensile stress for out of phase TMF (OP-TMF, η<0) and mean compressive stress for in-phase TMF (IP-TMF, η>0) can be found. The fatigue life of IP-TMF is longer than that of OP-TMF except for higher constraint factor, and the life of TMF decreases with the increasing absolute value of η. There are two different crack initiation mechanisms under the constrain TMF: primary phases broken mainly for OP-TMF and matrix deboned mainly for IP-TMF. The oxidation may have only little influence on the crack behavior and TMF life, considering the obvious damage by deboned or broken primary phases. The tensile stress is key factor for fatigue crack initiation and growth in primary phases (Si and intermetallic) under cyclic deformation. The TMF life under different constrain factor can be predicted by the strain energy model with good precision.
更新日期:2020-03-24

 

全部期刊列表>>
聚焦商业经济政治法律
智控未来
控制与机器人
化学研究精选
欢迎探索2019年最具下载量的地球科学论文
招募海内外科研人才,上自然官网
基因组学对精准公共卫生的影响,专辑征稿
隐藏1h前已浏览文章
课题组网站
新版X-MOL期刊搜索和高级搜索功能介绍
ACS材料视界
x-mol收录
湖南大学化学化工学院刘松
上海有机所
李旸
大连化物所
香港大学
X-MOL
支志明
中山大学化学工程与技术学院
试剂库存
天合科研
down
wechat
bug