Microstructure and Mechanical Properties of Brazed Joints Used in Electronic Devices

The microstructure and mechanical properties of brazed joints of oxygen-free copper and oxygen-free copper, nickel-plated kovar, monel, nickel-plated stainless steel were respectively studied by using AgCu28 and AuCu20 filler metal. Effects of different filler metal on microstructure of the brazed joints were analyzed through metallurgical microscope, SEM, EPMA. The brazed joints tensile strengths were analyzed through tensile test. The results indicate that the brazing process of oxygen-free copper and nickel content alloy used AgCu28 filler metal, nickel element is easy to diffused into AgCu28, AgCu28 filler metal with nickel element wetting spreadability along grain boundary of the oxygen - free copper, resulting in the penetration of the grain boundary of the oxygen-free copper. The joints brazed by AuCu20 filler metal have the better performance than the joints brazed by AgCu28 filler metal.

Research on Low-Phosphorus Steel Melting by Semi-Steel

In this study, double-slag method is used to melt low-phosphorous steel by semi-steel. The results show that, the average phosphorous content of the aimed molten iron of BOF is 0.0052% and after the first slag pure-out, the dephosphorization rate is 56.2%, while the total dephosphorization rate of BOF melting is 92.46%, rang from 91% to 93.4%. Low phosphorous content alloy and slag-stopping tapping technology is adopted and rephosphorization of molten iron is controlled in 0.002%. Finally the average phosphorous of the finished product is 0.0064%, range form 0.0055% to 0.0071%, which means that Pangang Group can produce the steel with phosphorous content is less than 0.008%.

PREPARING Ni–W ALLOY FILMS WITH LOW INTERNAL STRESS AND HIGH HARDNESS BY HEAT TREATING

In this paper, the internal stress and hardness of Ni – W alloy films with W contents in the range of 0–59 wt% were investigated. The amorphous Ni – W alloy films were electrodeposited with 59 wt% W content and the structure of crystalline alloy films was formed after heat treating. The experimental results showed that heat treating could prepare Ni – W alloy films with lower internal stress compared with low W content alloy films, and the heat treated alloy films still have high hardness. The internal stress and the hardness were about 230 MPa and 1000 Hv, respectively, when the heat treating temperature was 550°C. The relation of internal stress and hardness with the structure of alloy films is discussed.

Influence of Iron Content on the Mechanical Properties of AA6016 Alloy Sheet

The influence of the iron content from 0.1 to 1.0 mass% on the mechanical properties of AA6016-T4 sheets was investigated. The amount of the Al-Fe-Si second phase particles increased with the iron content, thus the solute silicon atoms decreased. Increasing of the Al-Fe-Si particles lowers the bendability, while decreasing of the solute silicon atoms lowers the paint bake response (PBR) and improves the bendability. The bendability of the samples then became the worst at the 0.5 mass% iron content, while it at 0.8 and 1.0 mass% became better or the same as that at 0.5 mass%. The increasing of the silicon content in the 1.0 mass% iron content alloy improved the PBR and lowered the bendability.

TRISTELLE ALLOY TS-3

Tristelle alloy TS-3 is an alloy of 35Cr-10Ni-12Co developed to withstand both corrosion and galling. This alloy relies on the formation of chromium-rich carbides during solidification. It is the highest carbon content alloy of the family of Tristelle alloys. (See TS-1, Alloy Digest SS-662, December 1996, and TS-2, Alloy Digest SS-668, January 1997). Alloy TS-3 is recommended for valve service. This datasheet provides information on composition, physical properties, and hardness. It also includes information on corrosion and wear resistance as well as joining. Filing Code: SS-672. Producer or source: Stoody Deloro Stellite Inc.

TRISTELLE ALLOY TS-2

Tristelle alloy TS-2 is an alloy of 35Cr-10Ni-12Co developed to withstand both corrosion and galling. This alloy relies on the formation of chromium-rich carbides during solidification. It is the intermediate carbon content alloy in this family, (See TS-1, Alloy Digest SS-662, December 1996, and TS-3, Alloy Digest SS-672, January 1997) and is recommended for valve service. This datasheet provides information on composition, physical properties, and hardness as well as fracture toughness. It also includes information on corrosion and wear resistance as well as joining. Filing Code: SS-668. Producer or source: Stoody Deloro Stellite Inc.

Wet Oxidation of Si1-x-yGexCy Layers on (100) Si

ABSTRACTSingle crystal Si0.63Ge0.36C0.01 and amorphous Si0.65Ge0.27C0.08 layers have been oxidized in a wet ambient at 700 °C and 900 °C. The oxide growth has been studied using Rutherford backscattering spectrometry and transmission electron microscopy. A reference sample of Si0.63Ge0.37 was also oxidized in order to determine the influence of C on the oxidation behavior. The lower C content alloy behaved similar to the SiGe alloy. Uniform Si1-xGexO2 was obtained at 700 °C whereas SiO2 was formed at 900 °C, and Ge piled up underneath the oxide. In both cases, C was not detected in the oxide layer. The amorphous Si0.65Ge0.27C0.08 alloy behaved significantly different at both oxidation temperatures in comparison with the crystalline Si0.63Ge0.36C0.01 and Si0.63Ge0.37. Negligible oxidation occurred at 700 °C whereas SiO2 was obtained at 900 °C and the rejected Ge distributed uniformly throughout the SiGeC alloy. It is proposed that fast Ge diffusion during oxidation at 900 °C resulted from diffusion at grain boundaries, since crystallization of the amorphous SiGeC layer occurred in conjunction with oxidation, leading to nucleation of ∼5 nm nanocrystals.

ZA-8

ZA-8 is a hypereutectic zinc-aluminum,highperformance die casting alloy. It is one of a family of three ZA Alloys which can be economically die cast with properties surpassing conventional zinc or aluminum alloys. It is the lowest aluminum content alloy of the family and it has the lowest melting point and casting temperature range. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness and fatigue. It also includes information on corrosion resistance as well as forming, machining, and surface treatment. Filing Code: Zn-48. Producer or source: Aluminum Smelting and Refining Company Inc.. See also Alloy Digest Zn-35, revised October 1991.