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7050铝合金FSW焊核区的微观组织和断裂机理
  • ISSN号:1673-5196
  • 期刊名称:《兰州理工大学学报》
  • 时间:0
  • 分类:TG146[金属学及工艺—金属材料;一般工业技术—材料科学与工程;金属学及工艺—金属学]
  • 作者机构:兰州理工大学有色金属先进加工与再利用省部共建国家重点实验室,甘肃兰州730050
  • 相关基金:国家自然科学基金(51265030),甘肃省高等学校基本科研业务费(01-0071),兰州市科技局项目(2013-4-20)
中文摘要:

采用搅拌摩擦焊对5mm厚7050铝合金板进行焊接,对焊核区洋葱环的宏观形貌、微观组织进行分析,并研究洋葱环对接头性能的影响.结果表明:焊核区出现的洋葱环组织实际是由粗晶带与细晶带相间构成的;当v=80mm/min、ω=600r/min时,焊核区形成完整的椭圆形洋葱环,随着转速提高,洋葱环的形状逐渐不规则;而当转速恒定时,随着焊速的提高,洋葱环逐渐变小;在接头中心预制缺口,然后进行拉伸试验,发现裂纹都是沿预制缺口经洋葱环中粗晶晶界扩展,表明环上粗晶带的出现会加速焊核区的裂纹扩展.

英文摘要:

7050 aluminum alloy plates with thickness of 5 mm were welded with friction stir welding, the macromorphology and microstructure of onion ring in welding nucleus zone were analyzed, and the effect of onion rings on the welded joint performance was investigated. The result showed that the onion ring structure in welding nucleus zone was actually composed of coarse grain belt interlaced with fine grain belt. When the welding speed was 80 mm/min and rotational speed was 800 r/min, an integral elliptic onion ring would appear in the welding nucleus zone. With the increase of rotational speed, the shape of the on- ion ring would gradually become irregular. When the rotational speed was constant, with the increase of welding speed, the onion ring would gradually become small. By preparing a notch at the weld joint cen- ter, a tensile test was performed. It was found that all cracks would propagate along the notch and through the coarse grain boundary in the onion ring, manifesting that the emergence of coarse grain belt in onion ring would accelerate the propagation of crack in the welding nucleus zone.

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期刊信息
  • 《兰州理工大学学报》
  • 北大核心期刊(2011版)
  • 主管单位:甘肃省教委
  • 主办单位:兰州理工大学
  • 主编:李有堂
  • 地址:甘肃省兰州市兰工坪路287号
  • 邮编:730050
  • 邮箱:journal@lut.cn
  • 电话:0931-2756301
  • 国际标准刊号:ISSN:1673-5196
  • 国内统一刊号:ISSN:62-1081/T
  • 邮发代号:54-72
  • 获奖情况:
  • 甘肃高等校优秀学术期刊,全国优秀高校自然科学学报及教育部优秀科技期刊评...,第二届国家期刊奖百种重点期刊
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  • 俄罗斯文摘杂志,美国化学文摘(网络版),美国数学评论(网络版),德国数学文摘,美国剑桥科学文摘,英国科学文摘数据库,中国中国科技核心期刊,中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版)
  • 被引量:6651