中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2014年
4期
870-877
,共8页
张新明%谈琦%刘胜胆%吴豫陇%宋丰轩%刘星兴
張新明%談琦%劉勝膽%吳豫隴%宋豐軒%劉星興
장신명%담기%류성담%오예롱%송봉헌%류성흥
7085铝合金%淬火速率%时效%扩散激活能%微观组织
7085鋁閤金%淬火速率%時效%擴散激活能%微觀組織
7085려합금%쉬화속솔%시효%확산격활능%미관조직
7085 aluminum alloy%quenching rate%aging%diffusion activation energy%microstructure
通过末端淬火实验、硬度测试、透射电子显微镜和差示扫描量热法,研究淬火速率对7085铝合金时效行为的影响。结果表明:在末端淬火过程中,距离淬火端越近,淬火速率越大,时效后的峰值硬度越高。当时效温度较低时,淬火速率越大,则空位扩散激活能越小,时效处理后的硬度达到峰值的时间越短,硬度值越大;随着时效温度的提高,不同淬火速率样品达到峰值的时间不断接近;当时效温度达到160℃时,不同淬火速率样品达到峰值的时间相同,均为10 h。TEM分析结果表明:随着淬火速率降低,淬火过程中析出的平衡相η数量和尺寸也随之增加,时效后析出的强化相η'数量减少,尺寸增加,弥散程度降低。
通過末耑淬火實驗、硬度測試、透射電子顯微鏡和差示掃描量熱法,研究淬火速率對7085鋁閤金時效行為的影響。結果錶明:在末耑淬火過程中,距離淬火耑越近,淬火速率越大,時效後的峰值硬度越高。噹時效溫度較低時,淬火速率越大,則空位擴散激活能越小,時效處理後的硬度達到峰值的時間越短,硬度值越大;隨著時效溫度的提高,不同淬火速率樣品達到峰值的時間不斷接近;噹時效溫度達到160℃時,不同淬火速率樣品達到峰值的時間相同,均為10 h。TEM分析結果錶明:隨著淬火速率降低,淬火過程中析齣的平衡相η數量和呎吋也隨之增加,時效後析齣的彊化相η'數量減少,呎吋增加,瀰散程度降低。
통과말단쉬화실험、경도측시、투사전자현미경화차시소묘량열법,연구쉬화속솔대7085려합금시효행위적영향。결과표명:재말단쉬화과정중,거리쉬화단월근,쉬화속솔월대,시효후적봉치경도월고。당시효온도교저시,쉬화속솔월대,칙공위확산격활능월소,시효처리후적경도체도봉치적시간월단,경도치월대;수착시효온도적제고,불동쉬화속솔양품체도봉치적시간불단접근;당시효온도체도160℃시,불동쉬화속솔양품체도봉치적시간상동,균위10 h。TEM분석결과표명:수착쉬화속솔강저,쉬화과정중석출적평형상η수량화척촌야수지증가,시효후석출적강화상η'수량감소,척촌증가,미산정도강저。
The effect of quenching rate on aging behavior of 7085 aluminum alloy was investigated by means of end quenching test, hardness test, transmission electron microscopy (TEM) and differential scanning calorimeter (DSC). The results show that the faster the quenching rate is, the higher the peak hardness is. With the quenching rate increasing, the lower the aging temperature is, the shorter time reaching the peak hardness is and the higher the hardness gets, which is related to the decrease of the vacancy diffusion activation energy. With the aging temperature increasing, the time reaching the peak hardness gets closer and closer, when aging at 160℃, the peak aging time are all 10 h. TEM observation shows that, with the decrease of quenching rate, the number and the size of quench-induced equilibriumη phase increase. After aging, the number and the diffusion degree ofη' strengthening precipitates decrease and the size becomes larger.