發(fā)布時(shí)間：2018-08-11 16:24

【摘要】：在Gleeble-3500熱力模擬試驗(yàn)機(jī)上對(duì)噴射成形7055鋁合金進(jìn)行了等軸壓縮試驗(yàn),基于動(dòng)態(tài)材料模型DMM繪制了合金的熱加工圖,確定了7055鋁合金一定應(yīng)變下的"安全區(qū)"和"非安全區(qū)"。結(jié)果表明:在試驗(yàn)條件下,應(yīng)變量為0.3和0.6的熱加工圖變化不顯著,流變失穩(wěn)區(qū)所對(duì)應(yīng)的功率耗散效率迅速下降。當(dāng)應(yīng)變量為0.6時(shí),適宜的加工參數(shù)為395~450℃和0.006~0.082 s~(-1),此時(shí)變形組織中發(fā)生動(dòng)態(tài)再結(jié)晶;不宜進(jìn)行加工的區(qū)間為350~450℃和0.22~5 s~(-1),該區(qū)間下變形組織易產(chǎn)生絕熱剪切帶,應(yīng)當(dāng)規(guī)避。
[Abstract]:The isoaxial compression test of spray formed 7055 aluminum alloy was carried out on the Gleeble-3500 thermal simulation machine. The hot working diagram of the alloy was drawn based on the dynamic material model DMM, and the "safe zone" and "no safe zone" of 7055 aluminum alloy under certain strain were determined. The results show that under the experimental conditions, the change of the hot working diagram with the strain of 0.3 and 0.6 is not significant, and the power dissipation efficiency corresponding to the rheological instability region decreases rapidly. When the strain variable is 0.6, the optimum processing parameters are 395C and 0.006C 0.082s-1, and dynamic recrystallization occurs in the deformed structure, and the unsuitable processing ranges are 350,450 鈩，

本文編號(hào)：2177559