首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Effects of particulate reinforcements on the hardness, impact and tensile strengths of AA 6061-T6 friction stir weldments
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Effects of particulate reinforcements on the hardness, impact and tensile strengths of AA 6061-T6 friction stir weldments

机译:颗粒增强对AA 6061-T6摩擦搅拌焊胶硬度,冲击和拉伸强度的影响

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摘要

Due to loss of structural strengthening at temperatures beyond 250°C, heat-treated aluminium alloys (e.g. AA 6061-T6) weldments are usually characterized with poor mechanical properties including hardness, tensile and impact strengths. In this work, friction stir weldments of AA 6061-T6 reinforced with the additions of SiC, B_(4)C and Al_(2)O_(3)particles at the joints were produced and investigated for improved hardness, tensile strength and impact strength over the unreinforced weldment. The results showed that the entire reinforced welded joint exhibited improved hardness because of the enhanced metal matrix grain refinement and inherent high hardness of the reinforcement particles. B_(4)C particle addition produced hardest joint of about 81% of the base metal hardness (∼114 HV_(0.3)). The impact energies of the SiC (16.9 J), B_(4)C (16.5) and Al_(2)O_(3)(12.2 J) reinforced weldments are closer to that of the base metal (18.6 J) compared with the unreinforced weldment (9.6 J). The reinforced weldments showed no significant improvement over the tensile strength of the unreinforced weldment. B_(4)C and SiC reinforcements produced the highest improvements in the hardness (at the joint) and impact strength of the AA 6061-T6 friction stir weldments, respectively.
机译:由于在超过250°C的温度下的结构强化的损失,热处理的铝合金(例如,AA 6061-T6)焊的焊料通常具有差的机械性能,包括硬度,拉伸和冲击强度。在这项工作中,通过在接头中加入和调查接头的SiC,B_(4)C和Al_(2)O_(3)颗粒增强的AA 6061-T6的摩擦搅拌焊料,并研究了改善的硬度,拉伸强度和冲击强度在不合因的焊接上。结果表明,由于增强颗粒的金属基质晶粒细化和固有的高硬度,整个增强焊接接头具有改善的硬度。 B_(4)C颗粒添加最强的接头,约占贱金属硬度的81%(〜114 hV_(0.3))。 SiC(16.9J),B_(4)C(16.5)和AL_(2)O_(3)(12.2J)加强焊接的冲击能量与基础金属(18.6J)相比更接近基础金属(18.6 j)焊接(9.6 j)。增强焊的焊接显示出对不合因的焊接的拉伸强度没有显着改善。 B_(4)C和SIC增强件分别产生了AA 6061-T6摩擦搅拌焊接的硬度(接头)和冲击强度的最高改进。

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