Sc对Al-Li-Cu-Mg-Ag-Zr合金组织和性能的影响

采用拉伸试验、金相、透射电镜、扫描电镜等测试手段，研究了Sc对Al-K-Cu-Mg-Ag-Zr合金的显微组织对拉伸性能的影响。结果表明，Sc细化了合金晶粒，促进了T1相的析出和均匀弥散分布，在一定程度上改变了合金的断裂行为，能使合金获得更好的综合机械性能。     

微量Sc对6005A合金微观组织与拉伸性能的影响

采用铸锭冶金法制备出不同Sc含量的6005A合金铸锭,合金铸锭经均匀化、热轧、中间退火、冷轧成2.5 mm厚的薄板,研究Sc含量对6005A合金拉伸性能、晶粒大小、金相组织及其相组成的影响。结果表明：微量Sc可提高6005A合金的强度,其中含0.07%Sc的合金具有最佳的拉伸性能,其抗拉强度、屈服强度分别提高19 MPa、47 MPa,伸长率也提高1.2%;添加微量Sc的合金晶粒得到细化,且随着Sc含量的增加,细化效果越明显;添加微量Sc减合金中枝晶的偏析,形成弥散的Al₃Sc相,抑制合金的再结晶;随着Sc含量的增加,晶内弥散的Mg₂Si相得到细化。     

Sc对铸造Al-Li合金组织演变及力学性能的影响

研究了Sc合金化对铸造Al-Li-Cu-Mg合金组织演变和力学性能的影响。结果表明,添加0.2%的Sc对合金晶粒细化效果显著,同时Sc合金化还会促进时效态合金基体中核/壳状复合结构粒子的析出。在室温及200℃下拉伸时,含Sc合金显示出更优异的强塑匹配性,这归因于细化强化和沉淀强化（δ′-Al3Li相及核/壳状复合结构粒子）的综合作用;当拉伸试验温度升高至300℃时,晶界弱化效应使含Sc合金的强度急剧下降而伸长率显著提升。断口形貌观察发现,基准合金室温的断裂模式为准解理断裂,温度对合金的断裂模式无显著影响;含Sc合金室温的断裂模式为典型的沿晶断裂,200℃下该合金的断裂模式转变为沿晶和穿晶混合断裂,拉伸试验温度提高至300℃,断裂模式最终变为微孔聚集型断裂。     

Sc、Zr对Al-Zn-Mg-Cu合金组织与性能的影响

制备了成分Al-5．8Zn-2．5Mg-1．6Cu-0．2Cr和Al-5．8Zn．2．5Mg-1．6Cu-0．2Cr-0．23Sc-0．12Zr的两种合金。通过金相显微镜及电镜观察、力学性能及腐蚀性能测试,分析了两种合金不同处理状态的显微组织及其不同状态下的力学性能和腐蚀性能。结果表明,添加Sc、Zr能显著细化合金的铸态组织,对合金的力学性能及腐蚀性能也起到极大的提高作用。添加Sc、Zr的2#合金与1#合金相比较,经T6处理后,前者的抗拉强度提高110N／mm^2,屈服强度提高91N／mm^2,伸长率也略有提高。     

Sc和Zr复合微合金化对Al-Zn-Mg-Cu合金组织与性能的影响

采用水冷铜模一激冷铸造法，制备了三种Sc和Zr含量不同的Al-Zn-Mg-Cu合金薄板材，测试了合金经120℃时效不同时间后的拉伸性能，利用光学显微镜和透射电子显微镜观察了合金的显微组织。结果表明：采用Sc和Zr复合微合金化可明显细化合金的铸态晶粒组织，抑制合金的再结晶，大大提高合金的强度；Sc含量越高，晶粒细化效果越好，合金强度提高也越大；微量Sc和Zr在Al-Zn-Mg-Cu合金中主要以Al3（Sc，Zr）质点的形式存在，初生Al3（Sc，Zr）粒子是在合金凝固过程中形成的，主要起非均质形核的作用，次生Al3（Sc，Zr）粒子是合金在均匀化处理和后续热处理中析出的，起亚结构强化和直接析出强化作用。     

微量Sc元素对Al-Cu合金组织与性能的影响

采用拉伸力学性能测试、扫描电镜与能谱分析等方法,研究了不同量稀土元素Sc对Al-4Cu合金组织与性能的影响。结果表明：稀土元素Sc能够细化Al-4Cu合金的晶粒组织,改善枝晶网胞;当Sc含量小于0．2％时,Al-4Cu合金的抗拉强度δb和屈服强度δ0.2提高约20MPa;当Sc含量为0．3％～0．4％时,抗拉强度δb和屈服强度δ0.2有所降低;当Sc含量为0．5％时,抗拉强度δb和屈服强度δ0.2又有所升高,但低于未添加Sc的Al-4Cu合金;Sc对合金的伸长率几乎没有影响。微量Sc元素添加到Al-4Cu合金中,当Sc含量小于0．2％时,基本上以固溶的形式溶入合金基体中;当Sc含量为0．3％。0．5％时,除部分固溶于Al基体中外,大部分形成起强化作用的Al3Sc相及交互作用AlCuSc相,AlCuSc相是Al-Cu-Sc系合金中的有害相,它使合金的力学性能在一定程度上有所降低。     

Sc含量对Al-Mg-Mn合金板材组织与性能的影响

采用半连续铸造-轧制技术制备了两种Sc质量分数含量为0.25%和0.10%的Al-Mg-Mn合金薄板,研究了稳定化退火工艺对两种不同Sc含量合金板材拉伸力学性能、剥落腐蚀性能和显微组织的影响。结果表明,两种合金冷轧板材稳定化退火过程中有相同的组织、性能变化规律,即随着退火温度升高,板材强度稍有下降而塑性升高,表现出很强的抗退火软化的能力,其中低Sc含量合金拉伸性能略低于高Sc含量合金的;其次,随退火温度的升高,板材抗剥落腐蚀的能力也表现出相同规律性的变化,200℃1 h左右退火时剥落腐蚀最严重,随着退火温度升高,抗腐蚀性能提高;两种合金冷轧板材在300℃1 h稳定化退火可以获得较好的综合拉伸力学性能和腐蚀性能,在此条件下,低Sc含量的合金板材抗拉强度、屈服强度和伸长率仍然分别达到437 N/mm2、340 N/mm2和16.3%,有很好的开发应用前景。     

Y和Sc对A356合金组织与性能的影响

对比研究了微量稀土元素Y、Sc对A356合金铸态显微组织和力学性能的影响。结果表明,0.3%的Y、0.3%的Sc均能明显减小合金中α-Al枝晶间距,细化α-Al晶粒,使片状共晶Si部分纤维化,但对Si变质效果均不如Sr。等量Y和Sc细化变质效果相比,Y的细化效果不如Sc,但Sc对共晶Si的变质效果不如Y;与之相对应,Y提高A356合金铸态力学性能的幅度优于等量Sc。     

微量Sc对Al-Cu-Li-Zr合金的微观组织和拉伸性能的影响

研究了微量Sc对Al-Cu-Li-Zr合金微观组织和拉伸性能的影响.结果表明:添加0.1%Sc(质量分数,下同)能消除铸态合金的枝晶组织,细化合金的晶粒.合金铸锭在随后的均匀化和热加工加热过程中,析出细小、弥散的次生Al3Sc质点,这种质点强烈地钉扎合金中的位错和亚晶界,从而有效地抑制合金的再结晶,具有亚结构强化和直接析出强化作用.加入微量Sc后,Al-Cu-Li-Zr合金的强度大大提高,并且合金的塑性也得到明显改善.     

Sc微合金化对Al-Mg-Si-Cu合金组织性能的影响

采用铸锭冶金法制备了Al-0.9Mg-0.6Si-0.7Cu-xSc合金,利用光学显微镜、扫描电镜和拉伸试验机研究了Sc元素对Al-0.9Mg-0.6Si-0.7Cu合金微观组织、力学性能和断口形貌的影响。结果表明,添加微量Sc形成的AlMgSiCuSc析出相可作为异质形核核心,显著细化铸态组织;在Al-Mg-Si-Cu合金中添加0.3wt%Sc,能强烈钉扎位错和亚晶界,有效阻碍固溶处理过程中的再结晶,从而提高合金的抗拉强度、屈服强度和延伸率;且Al-0.90Mg-0.59Si-0.70Cu-0.3Sc合金断口的韧窝数量较多、分布均匀,断口形貌为典型的韧性断裂。     

微量Sc对AA7085铝合金组织与性能的影响

通过铸锭冶金工艺,制备含微量Sc的AA7085铝合金。采用金相观察、力学性能测试、扫描电镜及透射电镜分析,研究添加0.3%Sc对基体合金的铸态及锻造态的显微组织和力学性能的影响。结果表明,添加0.3%Sc能细化铸态合金的晶粒,抑制锻造态合金的再结晶,最终提高基体合金的强度和断裂韧性;含0.3%Sc的合金抗拉强度达到562MPa,断裂韧性KIC(S-L)达到34MPa·m1/2。含Sc的AA7085合金的强化机制主要是Al3(Sc,Zr)相引起的细晶强化、亚结构强化和沉淀强化。     

添加微量Sc、Zr对超高强铝合金微观结构和性能的影响

采用低频电磁铸造技术制备Al-9Zn-2.8Mg-2.5Cu-x Zr-y Sc（x=0,0.15%,0.15%;y=0,0.05%,0.15%）合金,借助金相显微镜、扫描电镜、透射电镜、力学性能测试等手段分别对其均匀化、热挤压态、固溶态和时效态的组织与性能进行对比分析。结果表明：添加微量Sc和Zr,会在凝固过程中形成初生Al3（Sc,Zr）,可显著细化合金铸态晶粒;均匀化时形成的次生Al3（Sc,Zr）粒子可以强烈钉扎位错和亚晶界,有效抑制变形组织的再结晶,显著提高合金的力学性能。与不含Sc、Zr的合金相比,含0.05%Sc和0.15%Zr的合金经固溶处理和峰值时效处理后其抗拉强度和屈服强度分别提高172 MPa和218 MPa,其强化作用主要来自含Sc、Zr化合物对合金起到的亚结构强化、析出强化和细晶强化。     

Effect of minor Sc and Zr on microstructure and mechanical properties of Al-Zn-Mg-Cu alloy

1 Introduction The microstructure and properties of aluminium alloys are strongly affected by adding small quantities of scandium. Minor Sc may improve the temperature of recrystallization and fracture toughness, decrease the sensitivity of stress corrosi…     

微量Sc对2195铝锂合金应变时效态的显微组织和力学性能的影响

采用拉伸试验机、光学金相显微镜、透射电镜、扫描电镜等设备研究了添加微量Sc对2195铝锂合金应变时效态的显微组织和拉伸性能的影响。结果表明：微量Sc加入后能生成细小弥散Al3(Sc，Zr)质点，起到抑制再结晶的作用；微量Sc的加入既促使合金晶内析出的T1相分布更弥散均匀，又能使亚晶界和晶界上析出的T1相变得细小，几乎不出现明显的晶界无析出带，因而可在不降低合金强度的前提下有效地改善其塑性。     

Effects of minor Sr,Sn and Sc addition on as-cast microstructure and mechanical properties of ZA84 magnesium alloy

The effects of minor Sr, Sn and Sc addition on the as-cast microstructure and mechanical properties of the ZA84 magnesium alloy were compared. The results indicate that addition of 0.1%Sr, 0.5%Sn or 0.3%Sc (mass fraction) to the ZA84 alloy can refine the grains of the alloy. Furthermore, addition of 0.1%Sr to the ZA84 alloy does not obviously change the morphology and distribution of Mg32(Al,Zn)49 phase. However, addition of 0.5%Sn or 0.3%Sc not only refines and modifies the Mg32(Al,Zn)49 phase but also suppresses the formation of Mg32(Al,Zn)49 phase, especially with the addition of 0.3%Sc. Furthermore, addition of 0.1%Sr, 0.5%Sn or 0.3%Sc to the ZA84 alloy improves the tensile properties at room temperature and 150℃, especially with the addition of 0.1%Sr and 0.3%Sc. However, addition of 0.1%Sr is not beneficial to the creep properties, and addition of 0.5%Sn has no obvious influence on the creep properties. Oppositely, addition of 0.3%Sc to the ZA84 alloy greatly improves the creep properties.     

Effects of minor Sc on microstructure and mechanical properties of Al-Zn-Mg-Zr alloy welded joint

Two kinds of AI-6.0Zn-2.0Mg-0.12Zr and AI-6.0Zn-2.0Mg-0.2Sc-0.12Zr alloy plates were prepared by ingot-metallurgy. The alloy plates with 3 mm thickness were welded by argon shield welding method, and the mechanical properties and microstructures of the two welded joints filled with AI-Mg-Sc welding wire were studied comparatively. The results show that firstly, minor Sc can raise the mechanical properties of the Al-Zn-Mg-Zr base alloy greatly. The reason for the increment is the fine grain strengthening, precipitation strengthening and the substructure strengthening caused by Al3（Sc, Zr）. Secondly, η phase （MgZn2） and grain size in the heat-affected zone of the alloy without Sc become coarse obviously, the η＇ phase （MgZn2） in the heat-affected zone of the alloy with Sc becomes coarse also, but the grain size has no visible change. Al3（Sc, Zr） particles are rather stable and can inhibit the movement of dislocation/land sub-grain boundaries, overaging softening is not serious. Thirdly, adding minor Sc can raise the strength of welded joint remarkably, the tensile strength of alloy with Sc increases from 395 MPa to 447 MPa and the welding coefficient increases from 0.7 to 0.8 as well. The reason for the high strength of welded joint with Sc addition is the fine grain strengthening, precipitation strengthening and the increasing of resistance to thermal cycling softening caused by Al3（Sc, Zr）.     

Mechanical properties and thermal stability of 7055 Al alloy by minor Sc addition

This study investigated the effect of 0.25 wt% Sc addition on the microstructure and mechanical properties of AA 7055 alloy.The addition of Sc obviously refined the grains of AA 7055 alloy during casting,homogenizing,rolling,solution,and aging treatments due to the formation of primary and precipitate Al₃(Sc,Zr) phase.The recrystallization and precipitation of AA 7055 alloy were inhibited during heat treatments by Sc addition.The Sccontaining AA 7055 alloy exhibited higher thermal sta...     

添加微量Sc对Mg-3%Li合金组织与性能的影响

用真空感应熔炼炉制备了Mg-3%Li和Mg-3%Li-1%Sc两种不同成分的合金。对Mg-3%Li-1%Sc合金进行了固溶和时效热处理。分析了添加Sc对合金组织及性能的影响。结果表明,添加1%Sc后,Mg-3%Li合金的晶粒细化,组织更加均匀,经200℃×9h时效热处理后,Mg-3%Li-1%Sc合金的硬度更高,综合力学性能得到提高。MgSc点状相在基体上均匀地弥散析出和晶粒细化是合金强化的主要原因。     

Microstructures evolution and mechanical properties disparity in 2070 Al-Li alloy with minor Sc addition

The microstructures and mechanical properties of Al-3.35Cu-1.2Li-0.4Mg-0.4Zn-0.3Mn-0.1Zr (mass fraction, %) alloy with Sc addition or free Sc were investigated through tensile test, SEM, EPMA and TEM. The addition of 0.082% (mass fraction) Sc element leads to the formation of Cu-rich and Sc-contained nano-sized Al₃(ScZr) particles and W phase particles. The Al₃(ScZr) particles can inhibit recrystallization to a certain extent and impede recrystallized grain growth during solution treatment. It is found that W phase cannot dissolve in supersaturated solid solution during the solution heat treatment, and the Cu content in the solutionized matrix is decreased, which causes a decrease in the fraction of Cu-contained strengthening precipitates with T₁ (Al₂CuLi) and θ′ (Al₂Cu) under T8 aging condition. Due to the formation of the W phases, the small Sc addition causes a little reduction in the strength.     

Zr元素对Al-Mn-Si-Zn系铝合金组织与性能的影响

研究Zr添加对Al-Mn-Si-Zn合金显微组织、力学性能及电化学性能的影响。透射电镜观察表明,Zr合金化可使退火态合金中的析出相更加细小、弥散,但是对模拟钎焊态合金的影响较弱。拉伸实验结果表明,添加Zr能够显著提高退火态合金的力学性能,但是对模拟钎焊态合金影响不大。电化学实验结果则表明,Zr元素的添加可降低退火态合金的抗腐蚀性能,但是对模拟钎焊态合金的影响不大。