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Al-Zn-Mg-Cu alloy is a favorable choice for aerospace applications requiring good combination of strength and toughness, which is greatly influenced by the coarse intermetallic particles. The evolution of intermetallic particles in an Al-Zn-Mg-Cu alloy during heat treatment was studied by field emission gun scanning electron microscopy (FEG-SEM) and X-ray diffractometry(XRD). The results show that there are lamellar eutectic structure (α(Al)+Mg(Zn,Al,Cu):) and Al7Cu:Fe particles in the solidified structure. The Al7Cu2Fe particles are embedded in the eutectic structure. The content of eutectic structure decreases with the increase of holding time and disappears after 24 h. The size and morphology of Al7Cu:Fe particles exhibit no change during the heat treatment. It is found that the AI:CuMg phase is formed during the treatment at 460 ℃. A transformation process from the primary eutectic phase Mg(Zn,Al,Cu)2 to Al2CuMg is observed, and the transformation mechanism and kinetics are analyzed, The AI:CuMg constituents form in the primary Mg(Zn,Al,Cu): phase, and grow along the eutectic microstructure. 相似文献
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1 Introduction The solute redistribution during solidification leads to microsegregation and the formation of coarse intermetallic particles, which can significantly influence the properties and productivity of the 7000 series aluminium alloys[1]. In ord… 相似文献
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某产品零件通过钣金冲压工艺制造,所用材料为5A06板材。在一段时间内经常发生开裂,冲压成形率低。为了提高5A06板材的成形率,本文对冲压开裂的原因进行了分析,研究了退火温度对5A06板材组织和性能的影响,为冲压工艺中退火工艺的制订提供了参考。 相似文献
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通过扫描电子显微镜(SEM)和能谱扫描仪(EDS)等分析方法,结合力学性能试验,研究了TA1/Q235R爆炸焊接复合板的界面组织与力学性能。结果表明:TA1/Q235R在爆炸焊接后形成了规律的波状结合界面以及不均匀的漩涡状组织。漩涡组织主要由TiFe、TiFe2等脆性金属间化合物组成,漩涡组织中裂纹、夹杂物、脆性金属间化合物等缺陷导致界面的破坏易沿波形轨迹发生;钛/钢界面拉伸剪切强度达194 MPa,复合板的最大抗拉强度为440 MPa;拉剪断口表现为以脆性断口为主的混合断裂特征,断口特征表明漩涡组织中金属熔化层对钢侧的结合强度高于钛侧。板材拉伸断口为韧性断口。 相似文献
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Cu 含量对Al-Zn-Mg-Cu合金的组织性能和断裂行为的影响 总被引:3,自引:0,他引:3
介绍了Cu含量对Al-Zn-Mg-Cu合金组织性能和断裂行为的影响。利用光学显微镜、扫描电镜、X射线衍射等方法对合金的组织和断口进行了分析。结果表明,Cu含量对合金中粗大金属间化合物的类型和含量有较大的影响。含w(Cu)=2.3%的高Cu的Al-Zn-Mg-Cu合金中粗大金属间化合物较多,Al2CuMg较多。过时效状态下,高Cu的Al-Zn-Mg-Cu合金断口以粗大的Al2CuMg粒子开裂的韧窝为主;含w(Cu)=1.7%的低Cu合金断口以晶粒内小的穿晶韧窝为主。高Cu的Al-Zn-Mg-Cu合金中粗大的Al2CuMg粒子消耗了大量的Cu,降低了合金强化的潜力,在过时效状态下促进合金开裂。 相似文献
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