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袁鸽成, 梁春朗, 刘洪, 袁潜. 搅拌摩擦焊焊接5083铝合金板材焊核区的晶体取向[J]. 焊接学报, 2014, 35(8): 79-82.
引用本文: 袁鸽成, 梁春朗, 刘洪, 袁潜. 搅拌摩擦焊焊接5083铝合金板材焊核区的晶体取向[J]. 焊接学报, 2014, 35(8): 79-82.
YUAN Gecheng, LIANG Chunlang, LIU Hong, YUAN Qian. Crystal orientation in nugget zone of friction stir welded 5083 aluminum alloy plates[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(8): 79-82.
Citation: YUAN Gecheng, LIANG Chunlang, LIU Hong, YUAN Qian. Crystal orientation in nugget zone of friction stir welded 5083 aluminum alloy plates[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(8): 79-82.

搅拌摩擦焊焊接5083铝合金板材焊核区的晶体取向

Crystal orientation in nugget zone of friction stir welded 5083 aluminum alloy plates

  • 摘要: 采用搅拌摩擦焊焊接了5083铝合金板材,借助电子背散射衍射技术和取向成像分析软件,对比性地分析了母材和焊核区的晶粒形貌、取向差分布、织构组分及取向分布函数,分析了焊核区晶体取向的变化.结果表明,在热-力作用下,焊核区发生动态再结晶,显示等轴晶粒形貌,平均晶粒尺寸约为15.8μm,同时大角度晶界比例明显增加.母材的黄铜织构B011 <211> 和S织构123 <634> 的比例分别达到30.6%和13.6%以上;搅拌摩擦焊后,焊核区的B织构和S织构的比例分别降至4%和1.8%,原位再结晶形成的R124 <211> 织构组分约为7.7%,焊核区其它常见面心立方金属织构组分的比例均低于8%,意味着焊核区由强取向组织转变为弱取向组织.

     

    Abstract: The cold rolled 5083 aluminum alloy plates were welded by friction stir welding(FSW). The characteristics of grains orientation evolution in FSW nugget zone(NZ) was researched by electron backscatter diffraction(EBSD) and orientation imaging microscopy(OIM) with analyzing grain characterization, misorientation distribution, textures distribution and orientation distribution function(ODF). The results show that the dynamic recrystallization occurred in NZ due to the effect of heat and deformation which caused a severe plastic flow. Crystal in nugget zone appears to be equiaxed grain with average size 15.8μm, and fraction of high angle grain boundaries(HAGB) appreciably increased. In the base metal, there were strong Brass texture 011 <211> and S texture 123 <634> that total fractions were above 30.6% and 13.6%, respectively. Conversely, after FSW, B and S textures in the NZ were obviously weakened as total fraction of only 4% and 1.8%, respectively. Furthermore, although the fraction of R texture 124 <211> caused by in-situ recrystallization is up to 7.7%, other common textures in face centered cubic(FCC) metal were weak in the NZ, and every fractions was also below 8%, which means that strong orientation turned into weak orientation in nugget zone.

     

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