S. Babu
材料科学技术（英文）
Friction stir lap welds were produced in 3 mm thick Alclad sheets of Al alloy 2014-T4 using two different tools (with triangular and threaded taper cylindrical pins). The effects of tool geometry on weld microstructure, lap-shear performance and failure mode were investigated. The pin profile was found to significantly influence the hook geometry, which in turn strongly influenced the joint strength and the failure mode. Welds produced in alloy 2014-T4 Alclad sheets by using triangular and threaded taper cylindrical tools exhibited an average lap-shear failure load of 16.5 and 19.5 kN, respectively, while the average failure load for standard riveted joints was only 3.4 kN. Welds produced in alloy 2014-T6 Alclad sheets and in alloy 2014-T4 bare sheets (i.e.,
no Alclad) were comparatively evaluated with those produced in alloy 2014-T4 Alclad sheets. While the welds made (with threaded taper cylindrical tool) in T6 and T4 conditions showed very similar lap-shear failure loads, the joint efficiency of the welds made in T6 condition (43%) was considerably lower (because of the higher base material strength) than those made in T4 condition (51%). The Alclad layers were found to present no special problems in friction stir lap welding. Welds made with triangular tool in alloy 2014-T4 Alclad and bare sheets showed very similar lap-shear failure loads. The present work provides some useful insights into the use of friction stir welding for joining Al alloys in lap configuration.
关键词:
Aluminum alloys
焦好军
,
周炼刚
,
王明正
,
程昊
,
张志勇
宇航材料工艺
针对2A14、2219、2195、2A97、1460铝合金,通过焊接热模拟试验、焊接裂纹敏感性试验和拉伸试验,建立了材料脆性温度区间大小和焊接性的关系及焊丝主成分和焊接性的关系.结果表明,试验合金焊接性从好到差的排列顺序为2219、2A14、1460、2195、2A97.其中2A14、2219铝合金现用焊丝可以满足推进剂贮箱用铝合金焊接性要求.脆性温度区间较小时,焊接性良好,随脆性温度区间增加,焊接性变差；采用满足主成分含量之和为6％的焊丝焊接时,若抗裂性满足要求,则接头延伸率满足要求.
关键词:
铝合金
,
焊接裂纹敏感性
,
接头延伸率
蔡晶琦
,
王悦
,
陈桂才
,
王礼良
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2014.06.020
介绍了关于铝合金板材的一种热冲压冷模具淬火复合成型工艺.该工艺在铝合金板材的成型过程中,同步完成铝合金板材的淬火,随后进行人工时效,极大地提高了铝合金板材的成型极限和强度.因此,成型件具有更轻的质量,更高的强度和更复杂的几何形状.最后讨论了使用该成型工艺的成型件在航天领域应用前景.通过对铝合金板材复合成型工艺和应用的介绍,可为我国铝合金板材成型工艺发展和工业化提供参考.
关键词:
铝合金
,
复合成型
,
高强度
