EFFECT OF HEAT TREATMENT BEFORE WELDING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF FRICTION STIR WELDED SiCp/Al-Cu-Mg COMPOSITE JOINTS

doi:10.3724/SP.J.1037.2013.00719

Acta Metall Sin

2014, Vol. 50

Issue (4): 489-497 DOI: 10.3724/SP.J.1037.2013.00719

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EFFECT OF HEAT TREATMENT BEFORE WELDING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF FRICTION STIR WELDED SiC_p/Al-Cu-Mg COMPOSITE JOINTS

WANG Dong^1,², WANG Quanzhao², XIAO Bol², NI Dingrui², MA Zongyi²(

)

1 School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026
2 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

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WANG Dong, WANG Quanzhao, XIAO Bol, NI Dingrui, MA Zongyi. EFFECT OF HEAT TREATMENT BEFORE WELDING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF FRICTION STIR WELDED SiC_p/Al-Cu-Mg COMPOSITE JOINTS. Acta Metall Sin, 2014, 50(4): 489-497.

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Abstract

Discontinuously reinforced aluminum matrix composites (AMCs) have been widely applied in structures of aerospace industry. Wide industrial applications of AMCs depend on effective joining methods, which are dependent on the use of a specific material and process. As a new solid-state welding technique, friction stir welding (FSW) has been attempted for joining the AMCs in last few years. However, few attentions have been paid to the effect of initial heat treatment tempers of the AMCs on the FSW joints. In this work, 6 mm thick SiC_p/2009Al composite plates in both soft (solution temper) and hard (natural aging temper) conditions were successfully friction stir welded at a rotation rate of 800 r/min and a welding speed of 100 mm/min (named as Sol-FSW and T4-FSW samples). In the nugget zone (NZ) of both samples, the grain size and the distribution of the coarse Al₂Cu phases were similar. In the heat affected zone, two low hardness zones (LHZs) were observed. LHZ I adjacent to the NZ had the lowest hardness. Both samples had the similar hardness in this zone. For the Sol-FSW sample, LHZ II far away from the NZ had a higher hardness and was closer to the NZ compared to that of the T4-FSW sample. The ultimate tensile strength of both the samples was similar and reached 83% of T4-tempered base metal. Both samples failed in LHZ I adjacent to the NZ due to the lowest hardness in this zone. This indicates that for the SiC_p/2009Al composite under solution temper it is possible to produce similar joints to that under natural aging temper using FSW technique. FSW of the composites under soft condition is beneficial to enlarging the welding process window and reducing the tool wear.

Key words: aluminum matrix composite friction stir welding microstructure precipitate mechanical property

Received: 11 November 2013

ZTFLH:

TG146. 2

Fund: Supported by National Basic Research Program of China (No.2012CB619600)

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	Dong WANG
	Quanzhao WANG
	Bol XIAO
	Dingrui NI
	Zongyi MA

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00719 OR https://www.ams.org.cn/EN/Y2014/V50/I4/489

表1 15%SiC_p/2009Al复合材料FSW接头及母材的热处理状态

Fig.1

固溶态及自然时效态15%SiC_p/2009Al的FSW接头硬度曲线

Fig.2

固溶态及自然时效态15%SiC_p/2009Al的FSW接头及母材的拉伸断口

Table 2 Tensile properties of FSW 15%SiCp/2009Al joints and base material

Fig.3

固溶态15%SiC_p/2009Al的FSW接头宏观形貌

Fig.4

固溶态及自然时效态15%SiC_p/2009Al的FSW接头及母材的金相组织

Fig.5

固溶态及自然时效态15%SiC_p/2009Al的FSW接头及母材的背散射电子像

Fig.6

固溶态及自然时效态15%SiC_p/2009Al的FSW接头及母材的XRD谱

Fig.7

固溶态及自然时效态15%SiC_p/2009Al的FSW接头焊核区及母材的TEM像

Fig.8

固溶态及自然时效态15%SiCp/2009Al 的FSW接头LHZ I 的TEM像

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