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1、碩士論文Cu.zn.A】形狀記憶舍金等離予柬流的連接研究摘要本文采用高能量密度等離子束流對(duì)Cu.Zn.AI形狀記憶合金進(jìn)行焊接方法、焊接工藝和焊后熱處理的力學(xué)、記憶性能進(jìn)行試驗(yàn)研究,主要進(jìn)行了以下工作:對(duì)銅及銅合金的焊接性進(jìn)行了分析,確定采用高能量密度等離子弧焊接方法的可行性,并組建了其焊接系統(tǒng);結(jié)合電阻對(duì)焊特點(diǎn)設(shè)計(jì)制作了試驗(yàn)系統(tǒng)所需的專用夾具,以利用夾具的預(yù)緊彈簧力將被熔化的焊縫金屬全部或部分?jǐn)D出,減小熱影響區(qū)的寬度,并盡可能改善晶粒狀態(tài),以提高其接頭質(zhì)量。研究了等離子弧焊接Cu.Zn-AI形狀記憶合金絲過程中的保護(hù)氣流量和
2、噴嘴距離;研究焊接電流、時(shí)間、離子氣流量等工藝參數(shù)的變化對(duì)接頭的影響,確定主要參數(shù)合理的調(diào)節(jié)范圍。對(duì)焊接接頭進(jìn)行了熱處理工藝試驗(yàn),通過對(duì)其x射線衍射分析后,確定本試驗(yàn)材料獲德記憶功能所需的熱處理工藝。比較研究了合金絲母材及焊接接頭熱處理后的抗拉強(qiáng)度、相變點(diǎn)、成分、形狀記憶效應(yīng)。并重點(diǎn)研究接頭的應(yīng)力誘發(fā)馬氏體相變現(xiàn)象,歸納出如下結(jié)論:誘發(fā)馬氏體相變的箍界應(yīng)力隨溫度升高而增大;表現(xiàn)出來的相變偽彈性是菲線性的;以及隨著機(jī)械循環(huán)次數(shù)的增多,殘余位移將增大,遲滯面積將減小,應(yīng)力誘發(fā)馬氏體相變的現(xiàn)象將逐漸消失,或弓
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