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研究生:孫如瑩
研究生(外文):Sun, Ju-Ying
論文名稱:鋁鋅鎂合金及其複合材料之超塑性成型與擴散接合複合加工研究
論文名稱(外文):A Combined Superplastic Forming/Diffusion Bonding Processing of an Al-Zn-Mg Alloy and a SiCp/Al-Zn-Mg Alloy Composite
指導教授:楊智富楊智富引用關係
指導教授(外文):Chih-Fu Yang
學位類別:碩士
校院名稱:大同工學院
系所名稱:材料工程學系
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:142
中文關鍵詞:擴散接合超塑性
外文關鍵詞:diffusion bondingsuperplastic
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中文摘要

本研 究探討航太工業材料超塑性7475鋁合金之超塑性成型與擴散接合複
合 加工研究,在10-4 torr 真空環境下,分別於515℃或530℃,2 MPa
、4 MPa 和 6 MPa 進行2到4小時之靜 壓接合研究,並配合超塑性成型
技術,以0.3 MPa 之氣壓吹製30分鐘,實作「帽型結構」。研究中以SPF/
DB複合加工技術所製作 之帽型結構試片藉由接合面之微觀組織,評估
SPF/DB複合加工試件之品質,並 與超塑性成型製作之帽型結構試片比較
其吹製試件高度,論及超塑性成型與擴 散接合同時進行時擴散接合對超
塑性成型性質之影響。結果顯示,超 塑性成型 與擴散接合同時進行時擴
散接合對超塑性成型性質只有微量之影響,並不會妨 礙超塑性成型進行
,且選用適當的接合條件,其接合性質亦相當良好,故鋁合 金超塑性 成
型與擴散接合複合加工為可行之製程。對15vol.% SiCP/7075 鋁基 複合
材料而言,其 超塑性擴散接合性質則遜於超塑性7475鋁合金。
本研究亦探討超塑性7475鋁合金、非超塑性7075鋁合金及15vol.%
SiCP/7075 鋁基複合材料之固相擴散接合與過渡液相擴散接合。其中固相
擴散 接合方式是以試片經表面處理後直接對接外,亦 有利用0.15mm 厚
度之7475 鋁 合金作為中間夾層進行接合,而過渡液相擴散接合則是利
用0.20mm 厚度之鋅 箔作為中間夾層來達到目的。接合後試片經OM、SEM
、GDOS分析與剪力測試, 評估接合件之品質。實驗結果顯示,經由適當
的接合方式及條件,其接合強度 可高達90%之母材強度。



ABSTRACT

In this study the SPF, the DB and the combined SPF/DB of a
superplastic 7475 Al alloy were studied. The solid state
diffusion bonding and the transient liquid Zn interlayer
bonding techniques to join similar materialsincluding
superplastic 7475 Al alloy, non-superplastic 7075 Al alloy and
SiCP/7075 Al alloy composite sheets were examined. A variety of
bonding techniques have been investigated on Al alloys including
solid state diffusion bonding (SSDB) with or without a thin 7475
Al alloy interlayer and trientliquid phase bonding (TLPB) using
a thin foil Zn interlayer. Diffusion bonding of Al alloys
specimens were carried out under a variety of bonding parameters
including compressive stress of 2, 4 and 6 MPa, bonding times
from 2 to 4 hours and bonding temperatures of 515 and 530℃ in
10-4 torr vacuum. The integrity of the bonds were examined using
optical and scanning electronmicroscopies. The bond strengths
were evaluated using a single overlap shear test. The results
showed that, with proper bonding conditions and surfacepre-
treatment, successful bonds with lap shear stress (T6 condition)
greater than 90 % of that of the parent alloy can be achieved.
The process variables of the combined SPF/DB practices of
superplastic 7475 Al alloy specimens were diffusion bonding at
515 or 530℃ for 2~4 hours under 2, 4 and 6 MPa compressive
stress in 10-4 torr vacuum and superplastic bulge forming at the
same temperature under 0.3 MPa gas pressure for 30 minutes.
Theresults showed that the bonding strengths in the combined
SPF/DB processed specimens were similar to those in DB
processed specimens under similar bondingconditions, and that
the properties in the joisection of the SPF/DB specimens were
not influenced by the latter SPF processing. In addition to
these, an attempt of the combined SPF/DB process on a SiCP/7075
Al alloy composite was conducted and the results was briefly
discussed. From the attainable dome height data and the
uniformity in thickness distribution of bulged domes, it was
found that the SPF behavior in the two-sheet SPF/DB superplastic
7475 Al alloy specimens was better than in the two-sheet SPF/DB
SiCp/7075 Al alloy composite specimens.



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