Nanoindentation was used to probe softening of the eutectic microstructure in a SnBi/Cu interconnect following thermal aging. Tests were conducted at constant loading rates and under constant loads to characterize the...Nanoindentation was used to probe softening of the eutectic microstructure in a SnBi/Cu interconnect following thermal aging. Tests were conducted at constant loading rates and under constant loads to characterize the flow stress and creep behavior of the eutectic microstructure. Aging was found to reduce the flow stress but to increase strain-rate sensitivity of the eutectic SnBi microstructure. While the reduction in the flow stress was related to the coarsening of the eutectic microstructure, the increased creep rate sensitivity was resulted from additional contribution of grain boundary movement to indentation creep.展开更多
The Fe- and Mn-rich intermetallics are of great effect on the mechanical properties of the AA5083 type alloy （Al-5Mg-0.8Mn）. The effect of Fe, Si and cooling rate on the formation of the intermetallics were investig...The Fe- and Mn-rich intermetallics are of great effect on the mechanical properties of the AA5083 type alloy （Al-5Mg-0.8Mn）. The effect of Fe, Si and cooling rate on the formation of the intermetallics were investigated by analyzing the microstructures of the alloys with different Fe and Si contents. The results indicated that increasing the Fe content resulted in the increase of the Al6（Fe,Mn） phase in both amount and size. In the alloys with high Fe content, the platelet-like Al6（Fe,Mn） compounds lined up and formed a band. Increasing the content of Si resulted in the increase of the Mg2Si phase which formed a network structure. Increasing the cooling rate significantly refined the intermetallics. However, increasing the cooling rate did not change the characteristic of the intermetallic compounds in the alloys with low or medium Si contents. For the alloys with high contents of Fe and Si under the condition of near-rapid cooling, the Fe- and Mn-rich intermetallic compound changed to the quaternary Al15（Fe,Mn）3Si phase and displayed a fine fish bone or Chinese script structure. The refinement of the intermetallics would allow higher tol- erance of Fe and Si contents in the AA5083 alloy produced, for instance, via the continuous strip casting process.展开更多
基金This study was supported by the National Natural Science Foundation of China under grant No.50228101the National Basic Research Program of China,No.2004CB619306.
文摘Nanoindentation was used to probe softening of the eutectic microstructure in a SnBi/Cu interconnect following thermal aging. Tests were conducted at constant loading rates and under constant loads to characterize the flow stress and creep behavior of the eutectic microstructure. Aging was found to reduce the flow stress but to increase strain-rate sensitivity of the eutectic SnBi microstructure. While the reduction in the flow stress was related to the coarsening of the eutectic microstructure, the increased creep rate sensitivity was resulted from additional contribution of grain boundary movement to indentation creep.
基金Research Foundation of Shenyang Aerospace University for its financial support
文摘The Fe- and Mn-rich intermetallics are of great effect on the mechanical properties of the AA5083 type alloy （Al-5Mg-0.8Mn）. The effect of Fe, Si and cooling rate on the formation of the intermetallics were investigated by analyzing the microstructures of the alloys with different Fe and Si contents. The results indicated that increasing the Fe content resulted in the increase of the Al6（Fe,Mn） phase in both amount and size. In the alloys with high Fe content, the platelet-like Al6（Fe,Mn） compounds lined up and formed a band. Increasing the content of Si resulted in the increase of the Mg2Si phase which formed a network structure. Increasing the cooling rate significantly refined the intermetallics. However, increasing the cooling rate did not change the characteristic of the intermetallic compounds in the alloys with low or medium Si contents. For the alloys with high contents of Fe and Si under the condition of near-rapid cooling, the Fe- and Mn-rich intermetallic compound changed to the quaternary Al15（Fe,Mn）3Si phase and displayed a fine fish bone or Chinese script structure. The refinement of the intermetallics would allow higher tol- erance of Fe and Si contents in the AA5083 alloy produced, for instance, via the continuous strip casting process.
