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| Effects of densification process on microstructure and properties of PM 6061 Al alloy |
| YANG Mengxiang，HUANG Pengpeng，SHI Siyang，WANG Jiaojiao，WU Yake，JIANG Feng |
| （State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China） |
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Abstract Aluminum alloy parts prepared by traditional powder metallurgy pressing and sintering process can ful‐
ly play the advantages of nearly net forming and lightweight. It will gradually replace some die-casting and ma‐
chined parts in automobile, electrical appliances and other industries, which is of great significance for energy con‐
servation and emission reduction. 6061 Al alloy was prepared by powder metallurgy technology, and the effects of
compaction pressure（140~330 MPa）and sintering temperature（566~616 ℃）on material density, microstruc‐
ture, dimensional change rate and properties were studied in this paper. In addition, T6 heat treatment was per‐
formed to improve mechanical properties of 6061 Al alloy. The results show that with the increase of compaction
pressure, the density and hardness of the sintered samples increase first and then decrease, the dimensional change
rate gradually decreases, and the tensile strength and electrical conductivity are improved continuously, but all the
indexes above are improved with the increase of sintering temperature. The improvement of compaction pressure
will gradually reduce the pores in the alloy substrate, increasing the sintering temperature can produce more lowmelting-point liquid phase filling pores to promote alloy density. In general, the comprehensive performance of
the sample pressed at 210 MPa and sintered at 616 ℃ are potential, with the density of 2.597 g/cm3, hardness of
38.4HV, tensile strength of 139 MPa and stable dimensional shrinkage rate of 1.6 %. Further, the sintered sample is
subjected to T6 heat treatment. After heat treatment, the hardness of the sample increases by 186 % to 109HV, the
tensile strength increases by 95% to 271 MPa, and the elongation after fracture decrease from 11.9 % to 2.2 % . This research can provide useful reference for the industrial development and application of powder metallurgy
6061Al alloy
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Received: 08 August 2022
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Corresponding Authors:
江 峰（1973—），男，博士，教授，博士生导师，主要研究方向为铁基粉末锻造，铝合金粉末冶金及高熵合金。
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2023, Vol. 33 
