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The soldering aluminum alloys containing high amounts of Mg with aid of ultrasonic vibration

超声波振动辅助焊接高镁铝合金

基本信息

批准号：
07555218
负责人：
WATANABE Takehiko
金额：
$ 3.97万
依托单位：
NIIGATA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555218/
关键词：
soldering Al-Mg alloy ultrasonic vibration Mg-inclusions Mg segregation Zn-Al-Si filler metal solidification control grain refinement ろう接 Mg表面偏析接合強度高Mg含有アルミニウム合金接合強さ EPMA,ESCA,AES 表面偏析

项目摘要

has been well known that the aluminum alloys containing a large amount of magnasium was impossible tobe soldered, so far. This study was carried out to make the soldering possible and to obtain the joints with higher sttrength introducing ultrasonic vibration into the soldered layrs.Since we have been successful in soldring the pure aluminum in atmosphere withou flux by using ultrasonic vibration, we tried to apply to the aluminum alloy containing magnasium difficult to be solderd with the aid of ultrasonic vibration. Using pure zinc metal, the joint of the tensile strength of approximately 160MPa was achieved. This strength is of about 50 % of a base metal, is not so sufficient. The detailed observation of soldered layr revealed that many Mg-inclusions ascribed to the dissolution of basemetal existed and the fracture path was along these inclusions, and it is expected that the formation of Mg-inclusions are the harmful factors to decrease the tensile strength of the joints.It was anal … More yzed with EPMA,AES and ESCA that magnasium was segregated onto the faying surface by heating, followed by causing the formation of the Mg-inclusions. Based on the analysis, the following countermeasure was adopted to increase the joint strength. That is, the heating rate was increased to suppress the magnesium segregation, and the filler metal of Zn-Al-Si alloy was used to decrease the dissolution of the base metal, and to increase the strength of a filler metal itself. As a result, the dissolution of the base matel was suppressed to some extent, but the joint tensile strength was insufficiently increrased.We selected again the pure zinc foil as a filler metal and examined the possibility to increase the joint tensile strenght through the grain refinement by solidifying structure control in addition to the suppression manganese segregation by rapid heating. These countermeasures increased successfully the joint tensile strength of the aluminum alloy containning Mg of 2.5% over the base metal strength.This new soldering method using ultrasonic vibration was applied to the commercially sized specimens. Unfortunately, the jointstrength was insufficient because the soldered area was of about 60% in the faying area due to the loss in transferring the ultrasonic vibration. Less

众所周知，到目前为止，含有大量镁的铝合金是不可能被焊接的。为了在焊接层中引入超声波振动，使焊接成为可能，并获得更高强度的接头，进行了这项研究。由于我们已经成功地利用超声波振动在无助焊剂的气氛下焊接了纯铝，我们尝试将超声波振动应用于难以焊接的含镁铝合金。采用纯锌金属，接头的抗拉强度达到约160MPa。这种强度约为母材的50%，是不够的。通过对焊接层的详细观察发现，由于基体的溶解，存在较多的mg夹杂物，断裂路径沿这些夹杂物延伸，推测mg夹杂物的形成是导致接头抗拉强度降低的有害因素。EPMA、AES和ESCA进一步分析表明，镁合金是通过加热将镁分离到合金表面，从而形成镁包裹体的。在此基础上，提出了提高接头强度的对策。即通过提高加热速率来抑制镁的偏析，采用Zn-Al-Si合金填充金属来减少母材的溶出，并提高填充金属本身的强度。结果在一定程度上抑制了基体的溶解，但接头的抗拉强度没有得到充分提高。我们再次选择纯锌箔作为填充金属，并考察了通过快速加热抑制锰偏析和控制凝固组织来细化晶粒以提高接头抗拉强度的可能性。这些措施成功地提高了含Mg 2.5%铝合金的接头抗拉强度。这种新的焊接方法利用超声波振动应用于商业尺寸的试样。不幸的是，由于超声波振动传递的损失，焊接区域约占fing区域的60%，因此接头强度不足。少