热处理工艺对微量Mn、Zr作用下的高纯Al-Cu-Mg-Ag合金性能的影响

研究了固溶处理和时效处理对微量Mn、Zr作用下的高纯Al-Cu-Mg-Ag合金性能的影响,结果表明:合金在520～525℃时,可以得到较好的力学性能,固溶时间对性能的影响不大。合金在160℃下时效12h可以达到峰时效,而在180℃下达到峰时效的时间仅需要4h。向Al-Cu-Mg-Ag中添加微量Mn、Zr元素可以大幅度的提高合金的延伸率,但Mn元素的添加却降低合金的抗拉强度,而Zr元素则大幅度的提高了合金的抗拉强度。在合金的耐热性能方面,微量Mn、Zr元素的添加均显著提高Al-Cu-Mg-Ag合金的热稳定性。     

汽车弹簧用合金钢的微合金化研究

对汽车弹簧用60Si2Mn合金钢中添加了微合金化元素Nb和V,并研究了其显微组织、力学性能、耐磨损性能和耐腐蚀性能。结果表明,添加微量合金元素Nb,尤其是复合添加微量合金元素Nb和V,可以提高60Si2Mn合金钢的力学性能、耐磨损性能和耐腐蚀性能。     

饰品用金及其新技术研究

从饰品金用量在世界金总需求中所占份额以及近年来饰品市场的迅速增长，说明金饰品工业在世界经济中的地位，介绍了饰品含金量表示法，饰品类型、典型合金成分和主要性能。以及饰品用金的新发展，如粉末金合金，电铸成型，新型高含金饰品合金９９０Ａｕ等。还讨论了金饰品市场，设计等有关问题。     

微量Cr元素对Cu-Ag合金力学性能的影响

采用真空熔炼方法制备了Cu-Ag和Cu-Ag—Cr合金，通过力学性能测试、金相显微镜和透射电镜分析等方法，研究了微量Cr对CuoAg合金组织和性能的影响。结果表明，添加微量cr元素能够明显提高Cu-Ag合金的再结晶温度和强度，Cu-Ag-Cr合金经450℃退火2h后的抗拉强度仍高达423MPa，能够满足高强高导铜合金高温性能的要求；微量Cr对Cu-Ag合金的强化主要来源于再结晶晶粒细化强化，第二相粒子析出强化和亚结构强化等。     

添加元素对Au-Cu合金强化影响的研究进展

介绍了金基合金的强化方式以及 Au-Cu 合金的强化特点,特别是添加元素对 Au-Cu 合金的有序化转变和时效硬化等的影响。探讨了Au-Cu系多元合金的各方面性能、应用及其最新的研究情况。     

Sc元素对Al-Mg-Si架空导线的组织及性能影响北大核心CSCD

在6201号Al-Mg-Si合金中添加微量的Sc元素,经过固溶时效处理后,研究了Sc元素对其组织结构、力学性能和电导率等性能的影响。结果表明:微量的Sc元素能显著细化Al-Mg-Si合金的晶粒,对合金的力学性能有很大的提升和优化,Sc含量为0.15%时,合金的抗拉强度增加到301 MPa,提高了49%,而导电率仅降低6.9%,同时Sc元素的添加也改善了合金的耐蚀性。     

Ni/P/Ce对SnAgCu抗氧化性能和结晶裂纹的影响

通过向Sn3.0Ag0.5Cu(SAC305)合金中添加微量的Ni,P和Ce元素,研究了各添加元素对合金钎料高温抗氧化性能和结晶裂纹的影响.结果表明,Ni元素的添加对钎料合金抗氧化性能没有很明显的改善,但明显地减少了合金表面结晶裂纹的总长度,抑制其产生;微量P元素的添加由于在合金钎料表面形成了复杂的致密新相,可以防止熔化钎料的表面直接与空气接触,明显改善了合金的抗氧化性能,但P元素的添加却增加了合金表面结晶裂纹的产生;Ce元素的添加恶化了钎料合金的抗氧化性,对合金表面的结晶裂纹抑制作用较小.     

微量TiC对Mo-Ti-Zr-TiC合金性能与显微组织的影响

采用粉末冶金方法制备Mo-Ti-Zr-TiC合金,研究微量TiC的添加对Mo-Ti-Zr-TiC合金的拉伸性能和显微组织的影响。结果表明,在Mo-Ti-Zr合金中添加微量TiC(0.1%～0.5%,质量分数)后,合金的相对密度和室温抗拉强度得到了提高,当TiC添加量为0.4%时,合金强度最高,较Mo-Ti-Zr合金提高了28.1%。微量TiC的添加,阻碍了合金烧结过程中的晶粒长大,合金晶粒尺寸随TiC添加量的增加而降低。添加的细小TiC粒子在高温烧结过程中或与坯体中的微量氧发生反应形成了由Mo、Ti、C及O4种元素组成的(Mo,Ti)xOyCz细小复合第二相粒子,或发生团聚结成大颗粒,对合金起到净化晶界氧和弥散强化的作用,因而合金的性能相比Mo-Ti-Zr合金有了较明显的提高。     

微量元素Cr对7136铝合金组织和性能的影响

在原有7136铝合金基础上添加微量过渡族元素Cr,采用铸造冶金法制备了合金。通过金相显微镜观察、扫描电镜观察、能谱分析以及拉伸性能和硬度测试,研究了Cr对7136铝合金组织和性能的影响。结果表明,微量元素Cr能细化铸态组织,抑制合金的再结晶,使合金元素分布更加均匀。该合金最大抗拉强度略有提高,塑性提高明显。     

Sc元素对Al-Mg-Si架空导线的组织及性能影响

在6201号Al-Mg-Si合金中添加微量的Sc元素,经过固溶时效处理后,研究了Sc元素对其组织结构、力学性能和电导率等性能的影响。结果表明:微量的Sc元素能显著细化Al-Mg-Si合金的晶粒,对合金的力学性能有很大的提升和优化,Sc含量为0.15%时,合金的抗拉强度增加到301 MPa,提高了49%,而导电率仅降低6.9%,同时Sc元素的添加也改善了合金的耐蚀性。     

The influence of various major and minor alloying elements on the corrosion of an Fe-40 %Cr Superferritic stainless steel in sulphuric acid

The corrosion resistance of an Fe-40%Cr superferritic alloy containing various major and minor alloying additions, e. g. nickel, molybdenum, aluminium, zirconium, nitrogen, niobium, titanium and ruthenium, as well as various combinations of them, was investigated in dilute sulphuric acid. Although small nickel and molybdenum additions alone cannot cause spontaneous passivation of the Fe-40%Cr alloy to which they are added, a combination of these two alloying elements result in an Fc-40%-Cr superferritic stainless steel which can passivated spontaneously in dilute sulphuric acid. Further additions of minor alloying elements like Ti, Nb, Ru and N have an influence on the time required to achieve spontaneous passivation and the final open-circuit potential eventually reached. Further additions of Al and Zr to the Fe-40%Cr-2%Ni-2%Mo alloy did not have much of an effect on the final open-circuit potential reached, and only affected the time required before this potential was reached in each case.     

铂族金属高温固溶强化型合金

讨论了高温固溶强化机制和合金元素对Pt固溶强化效应.介绍了铂族金属和Pt-Rh、Pt-Ir和Pt-Pd-Rh固溶型合金的的高温力学性能.借助不同的强化机制,在Pt-Rh或Pt-Pd-Rh合金中添加少量Ir、Ru、Mo、Au等组元,或微量稀有金属Zr、Hf或稀土金属,可以提高合金的高温强度性质和改善抗蠕变能力.     

Effect of Si on the Microstructure and Oxidation Resistance of Ti-Mo Alloys

JOM - Ti-Mo alloys with various Si alloying additions were prepared by reaction synthesis with Ti powders, Mo powders and Si powders as raw materials. The effect of Si alloying on the...     

合金化阻燃镁合金的研究进展

综述了合金化阻燃镁合金的研究进展和现状，重点介绍了Be、Ca、RE、Zn等合金阻燃元素以及复合添加阻燃元素对镁合金的阻燃性、组织和力学性能的影响，指出了开发合金化阻燃镁合金存在的问题及展望。最终得出结论；复合添加2种或3种以上阻燃元素是舍金化阻燃镁合金的未来发展趋势。     

Untersuchungen über das Korrosionsverhalten von Zirkoniumlegierungen I. Verhalten gegenüber wäßrigen Medien

Investigations into the corrosion behaviour of zirconium alloys I. Behaviour in the presence of aqueous media Extensive corrosion research covering 5O Zr alloys have shown that the good corrosion resistance of pure Zr cannot be improved to any greater extent by alloying. Pur Zr as well as most of its alloys have a high corrosion resistance; even in boiling mineral acids (20% H₂SO₄, HNO₃, and HCl) the corrosion rate is below 0.5 g/m²·d and no attack can be recognized in neutral salt solutions. The metal also resists attack by boiling 2O% KOH. Strong attack, however, it caused bv Fe-III-chloride. The metals do not resist attack by HF, while neutral KF attacks but little, however produces pitting. The effect of alloying additions is due to the structure produces by them: pure grain boundaries or very fine heterogeneous structures show good corrosion resistance. Ti, Hf, Sn and small amounts of Nb have little influence, Mo, W, larger amounts Nb and small pt and Re additions give rise to Local cells, while Fe, Cr and Ni have practically no influence.     

Electrode materials for electrospark alloying of machine parts

The conditions of producing tungsten alloys with chromium and molybdenum by thermal reduction methods of a scheelite concentrate with the additions of oxides of alloying elements are studied. The application of W–Cr and W–Cr–Mo alloys for electrospark alloying of the surface of machine parts increases the wear resistance of the parts 1.5–2 times.     

Effects of ternary alloying on mechano-synthesis and nano-crystal stability of an iron-silicon alloy

This paper reports the effects of ternary alloying additions Al, Cu and Nb to Fe₇₅Si₂₅ in high energy ball milling to produce nano-crystalline alloy powder, and its microstructural stability during subsequent high temperature annealing. It is shown that all additions generally retard grain growth up to some temperature. Nb appears to amorphise the alloy. The binary base alloy and Al containing alloy forms the DO₃ ordered structure at high temperatures accompanied by rapid grain growth. The Cu and Nb containing alloys precipitate Cu and Nb₂Fe at high temperatures but do not become ordered.     

The oxidation of Fe-Cr alloys containing an oxide dispersion or reactive metal additions

The oxidation of an iron-16% chromium alloy containing a dispersion of yttria particles and of iron-16 to 18% chromium alloys containing small additions of yttrium or zirconium has been studied at 1100 and 1200°C in 100 Torr oxygen. The yttria-containing alloy exhibited the excellent oxidation resistance usually associated with oxide-dispersion-containing alloys, having a thin, adherent, virtually iron-free scale which resisted the breakaway rapid oxidation behavior commonly found in Fe-Cr alloys in this composition range. Of the alloying additions intended to form a fine oxide dispersion during oxidation, only zirconium affected the oxidation behavior in a beneficial way, the scale on the yttrium-containing alloy being possibly less protective than that on the equivalent binary alloy.Supported by Battelle, Columbus Laboratories, Columbus, Ohio.     

Atomic site location by channelling enhanced microanalysis (ALCHEMI) in γ′-strengthened Ni- and Pt-base alloys

The additions of alloying elements to Ni- and Pt-base alloys influence the microstructure and thereby the creep properties, whereas the mechanism is uncertain. Therefore atomic site location by channelling enhanced microanalysis (ALCHEMI) was used to determine the site partitioning of ternary and quaternary alloying elements in the L1₂-ordered γ′-phase. Two ternary Ni–Al alloys with Cr and Ti additions were investigated. The measured site partitioning showed that Cr and Ti atoms prefer the Al-sublattice sites. For a ternary Pt–Al–Cr alloy, it was found that Cr atoms occupy Al sites. The influence of Ni as a fourth alloying element in a Pt–Al–Cr–Ni alloy on the site partitioning was also investigated. The detected results give evidence that in the quaternary alloy Cr and Ni atoms prefer the Pt sublattice. First principles calculations were used to support the experimental data.