<th id="5nh9l"></th><strike id="5nh9l"></strike><th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th><strike id="5nh9l"></strike>
<progress id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"><noframes id="5nh9l">
<th id="5nh9l"></th> <strike id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span>
<progress id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span><strike id="5nh9l"><noframes id="5nh9l"><strike id="5nh9l"></strike>
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"></span><span id="5nh9l"><video id="5nh9l"></video></span>
<th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th>
<progress id="5nh9l"><noframes id="5nh9l">

時效制度對6013鋁合金擠壓型材屈強比的影響

Effect of the aging process on the yield ratio of 6013 aluminum alloy extruded profile

  • 摘要: 以擠壓態的6013鋁合金為研究對象,通過顯微硬度測試、單向拉伸實驗和組織分析,研究了自然時效、人工時效和回歸再時效處理時合金的力學性能變化規律。結果表明:自然時效峰值狀態(16 d)的抗拉強度為286 MPa,屈服強度為158 MPa,屈強比為0.54,適合塑性成形;將自然時效峰值狀態下的試樣進行回歸再時效處理(210 °C回歸0.5 h+170 °C峰值時效2 h),抗拉強度為362 MPa,屈服強度為336 MPa,屈強比達到0.92,抗塑性變形能力顯著增強。這是因為回歸再時效后析出相的尺寸減小,數密度顯著增大,析出強化效果顯著增強。而析出強化對屈服強度和抗拉強度的影響程度不同,因此可通過時效熱處理來調控屈強比,即通過自然峰值時效提高合金的塑性變形性能以成形零件,而在零件成形后采用回歸再時效提高其抗變形能力。

     

    Abstract: Because of its high strength and good fracture toughness, 6013 aluminum alloy is widely used in auto and aircraft parts, such as the outer hood, outer decklid, and outer fuselage skin. An aluminum alloy must have good plastic forming ability in forming auto and aircraft parts and must have high deformation resistance in service. These performance requirements mainly depend on the yield ratio, that is, the ratio of yield strength to tensile strength. A lower yield ratio means larger deformation from the start of plastic deformation to the final fracture, which benefits formability. A higher yield ratio means higher plastic deformation resistance, which benefits service safety. In this paper, the mechanical properties and microstructure of the extruded 6013 aluminum alloy after natural aging, artificial aging, and retrogression re-aging are studied using microhardness tests, tensile tests, scanning electron microscopy, and transmission electron microscopy. The samples after the solid solution were naturally aged at room temperature and artificially aged at 170, 180, and 190 °C to determine the peak aging time. Then, after natural peak aging, the samples were heat-treated using the retrogression and re-aging process (retrogression at 200/210 °C for 0.5 h and re-aging at 170 °C). The results show that the tensile strength was 286 MPa, the yield strength was 158 MPa, and the yield ratio was 0.54 after natural peak aging for 16 d, which is suitable for plastic forming. The tensile strength was 362 MPa, the yield strength was 336 MPa, and the yield ratio reached 0.92 after the retrogression and re-aging process (retrogression at 210 °C for 0.5 h and peak re-aging at 170 °C for 2 h); the plastic deformation resistance was considerably enhanced. Compared with single-stage artificial aging, retrogression and re-aging can enhance the yield strength of 6013 aluminum alloy more substantially to break through the yield ratio limit in single-stage aging. Because the size of the precipitated phase decreases and the number density increases considerably after retrogression and re-aging, the precipitation strengthening effect is considerably enhanced. Precipitation strengthening has different effects on yield strength and tensile strength, so the yield strength ratio can be regulated by aging heat treatment. In other words, the plastic deformation and anti-deformation abilities of the alloy can be improved by natural peak aging and the retrogression and re-aging process, respectively.

     

/

返回文章
返回
<th id="5nh9l"></th><strike id="5nh9l"></strike><th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th><strike id="5nh9l"></strike>
<progress id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"><noframes id="5nh9l">
<th id="5nh9l"></th> <strike id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span>
<progress id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span><strike id="5nh9l"><noframes id="5nh9l"><strike id="5nh9l"></strike>
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"></span><span id="5nh9l"><video id="5nh9l"></video></span>
<th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th>
<progress id="5nh9l"><noframes id="5nh9l">
259luxu-164