【摘要】：為了解決5A90 Al-Li合金塑性加工困難的問題,通過理論分析與實(shí)驗(yàn)測試相結(jié)合的方法,對5A90 Al-Li合金板材的脈沖電流加熱特性進(jìn)行了研究。研究發(fā)現(xiàn),10 A·mm~(-2)的脈沖電流可在2 min內(nèi)將板材加熱到300℃。通過單向拉伸試驗(yàn)對5A90 Al-Li合金板材的高溫力學(xué)性能進(jìn)行了測試,測試結(jié)果表明,300℃時(shí),板材的伸長率可達(dá)63.4%。以脈沖電流加熱特性和高溫力學(xué)性能的研究為基礎(chǔ),對板材試驗(yàn)件的成形過程進(jìn)行了設(shè)計(jì),經(jīng)脈沖電流加熱后成形的試驗(yàn)件尺寸精度滿足設(shè)計(jì)要求,且表面質(zhì)量良好,無裂紋、劃傷等缺陷。脈沖電流輔助熱成形技術(shù)為5A90 Al-Li合金鈑金薄壁類零件的塑性加工提供了一條簡便、高效的途徑。
[Abstract]:In order to solve the difficult problem of plastic processing of 5A90 Al-Li alloy, the characteristics of pulse current heating of 5A90 Al-Li alloy sheet were studied by combining theoretical analysis with experimental test. It is found that the pulse current of 10 A mm~ (-2) can be heated to 300 鈩，

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