High Temperature Tensile Behavior Of Free-Standing Gold Films

1997 ◽  
Vol 505 ◽  
Author(s):  
R. Emery ◽  
C. Simons ◽  
B. Mazin ◽  
G. L. Povirk
Keyword(s):  
Low Temperatures ◽  
Tensile Testing ◽  
Elevated Temperatures ◽  
Tensile Tests ◽  
Tensile Behavior ◽  
Gold Films ◽  
Strain Rates ◽  
Free Standing ◽  
Increasing Temperature ◽  
High Temperature Tensile

ABSTRACTA method for tensile testing thin films at elevated temperatures is presented. Freestanding tensile specimens were prepared by evaporating 2.1 μm of gold onto a patterned oxidized silicon wafer. Tensile tests were performed at various temperatures up to 600°C. The ultimate tensile strengths of the films decreased as temperature increased, and ductility increased with increasing temperature. Films tested at high temperatures (≥ 400 °C) exhibited significant strain rate-dependence, while films tested at low temperatures (≤ 200 °C) were found to be virtually rate-independent. At higher temperatures and strain rates, stress-enhanced grain growth was observed.

Tensile Behavior of Ti-5Al-2.5Sn Alloy at Low Temperatures and High Strain Rates

2019 ◽  
Vol 794 ◽  
pp. 135-141
Author(s):  
Bin Zhang ◽  
Yang Wang
Keyword(s):  
Strain Rate ◽  
Strain Hardening ◽  
Low Temperatures ◽  
High Strain ◽  
Testing Temperature ◽  
Tensile Behavior ◽  
Experimental Results ◽  
Strain Rates ◽  
Increasing Temperature ◽  
Strain Hardening Rate

The mechanical responses of Ti-5Al-2.5Sn alloy at low temperatures were investigated under quasi-static and dynamic tensile loads using MTS system and SHTB system, respectively. Tensile stress-strain curves were obtained over the temperature range of 153 to 298K and the rate range of 0.001 to 1050 s-1. Experimental results indicate that the tensile behavior of Ti-5Al-2.5Sn alloy is dependent on strain rate and temperature. Yield stress and flow stress increase with increasing strain rate and decrease with increasing temperature. Results also indicate that strain hardening rate of Ti-5Al-2.5Sn alloy is lower at high strain rate, while strain hardening rate varies little with testing temperature. The Khan-Huang-Liang constitutive model was chosen to characterize the tensile responses of Ti-5Al-2.5Sn alloy at low temperatures and different strain rates. The model results coincide well with the experimental results within the tested temperature and rate ranges.

Tensile Behavior of Free-Standing Gold Films

1997 ◽  
Vol 472 ◽  
Author(s):  
R.D. Emery ◽  
D.X. Lenshek ◽  
B. Behin ◽  
M. Gherasimova ◽  
G.L. Povirk
Keyword(s):  
Thin Film ◽  
Tensile Strength ◽  
Tensile Testing ◽  
Metal Film ◽  
Tensile Behavior ◽  
Gold Films ◽  
Free Standing ◽  
Microelectronic Fabrication ◽  
Silicon Frame ◽  
Bulk Gold

ABSTRACTA method for tensile testing thin gold films is presented. Free-standing tensile specimens were prepared by evaporating 0.8 μm of gold onto a patterned oxidized silicon wafer. Using common microelectronic fabrication techniques, free-standing thin film specimens were produced that span rectangular windows in the wafer. The wafer was diced into individual tensile specimens composed of a thin film surrounded by a silicon frame. The final step before testing was to cleave the silicon frame so that the load was completely carried by the metal film. The ultimate tensile strength of the films was found to be approximately 150% greater than that of annealed bulk gold. In contrast, the measured elastic modulus for the thin film specimens was approximately the same as that documented for bulk gold.

HIGH-RATE TENSILE BEHAVIOR OF SILICONE RUBBER AT VARIOUS TEMPERATURES

2020 ◽  
Vol 93 (1) ◽  
pp. 183-194 ◽  
Author(s):  
Lingmei Guo ◽  
Yang Wang
Keyword(s):  
Strain Rate ◽  
Silicone Rubber ◽  
Tensile Tests ◽  
Tensile Behavior ◽  
High Rate ◽  
Uniaxial Tensile ◽  
Strain Rates ◽  
Strain Behavior ◽  
Split Hopkinson ◽  
Increasing Temperature

ABSTRACT The effects of strain rate and temperature on the tensile behavior of silicone rubber were investigated. The quasi-static uniaxial tensile experiments were conducted using an electromechanical testing system, and the high-rate uniaxial tensile tests were performed employing a modified split Hopkinson tension bar technique for low-strength and low-impedance materials. The tensile responses were obtained at strain rates of 0.001–1400 s−1 and temperatures ranging from −50 to 50 °C. The experiments reveal that the tensile stress–strain behavior of silicone rubber is nonlinear and highly dependent on strain rate and temperature. The values of stiffness and nominal stress at a given elongation increase with increased strain rate and decrease with increasing temperature. It is appropriate to postulate that the tensile response at high strain rates arises from the combination of hyperelasticity and viscoelasticity. According to the incompressibility assumption, a phenomenologically inspired visco-hyperelastic model was proposed to describe the constitutive behavior of silicone rubber over wide ranges of strain rates and temperatures.

Tensile Properties of Hot Extruded Mg-Zn-Nd-Y-Zr Alloy at Elevated Temperatures

2011 ◽  
Vol 415-417 ◽  
pp. 1157-1163
Author(s):  
Xiao Zhou ◽  
Hai Tao Zhou ◽  
Zhen Dong Zhang ◽  
Rui Rui Liu ◽  
Li Bin Liu
Keyword(s):  
Strain Rate ◽  
Elevated Temperatures ◽  
Peak Stress ◽  
Tensile Tests ◽  
Grain Boundary Sliding ◽  
Strain Rates ◽  
Zk60 Alloy ◽  
Boundary Sliding ◽  
Increasing Temperature ◽  
Zr Alloy

Mechanical properties of extruded Mg-Zn-Nd-Y-Zr alloy are investigated by tensile tests at various temperatures range from room temperature to 350°C with strain rates of 6.0×10-4-6.0×10-1s-1. It is found that the peak decrease with increasing temperature and decreasing strain rate, while the elongation increases with increasing temperature and decreasing strain rate. When deformation temperature is over 250°C, superplasticity occurs. This is ascribed to grain boundary sliding accommodated cavities growth. . At low temperature, the peak stress are a relatively higher than that of ZK60 alloy. This is explained by the grain refining effect and the precipitates of Mg9Nd and Mg6Zn3Y2.

Further experiments and modeling for microscale compression molding of metals at elevated temperatures

2007 ◽  
Vol 22 (7) ◽  
pp. 1839-1848 ◽  
Author(s):  
J. Jiang ◽  
W.J. Meng ◽  
G.B. Sinclair ◽  
E. Lara-Curzio
Keyword(s):  
High Temperature ◽  
Aspect Ratio ◽  
Tensile Testing ◽  
Elevated Temperatures ◽  
Low Cost ◽  
Mold Insert ◽  
Compression Molding ◽  
Mechanics Model ◽  
Replication Technique ◽  
High Temperature Tensile

Replication of metallic high-aspect-ratio microscale structures (HARMS) by compression molding has been demonstrated recently. Molding replication of metallic HARMS can potentially lead to low-cost fabrication of a wide variety of metal-based microdevices. Understanding the mechanics of metal micromolding is critical for assessing the capabilities and limitations of this replication technique. This paper presents results of instrumented micromolding of Al. Measured molding response was rationalized with companion high-temperature tensile testing of Al using a simple mechanics model of the micromolding process. The present results suggest that resisting pressure on the mold insert during micromolding is governed primarily by the yield stress of the molded metal at the molding temperature and a frictional traction on the sides of the insert. The influence of strain rate is also considered.

Mechanical Behaviors of Alloy 617 with Varied Strain Rates at High Temperatures

2014 ◽  
Vol 783-786 ◽  
pp. 1182-1187
Author(s):  
Mattias Calmunger ◽  
Guo Cai Chai ◽  
Sten Johansson ◽  
Johan Moverare
Keyword(s):  
Strain Rate ◽  
Power Plants ◽  
Elevated Temperatures ◽  
Fracture Strain ◽  
Tensile Tests ◽  
Strain Rates ◽  
Mechanical Behaviors ◽  
Contrast Imaging ◽  
Alloy 617 ◽  
Nickel Base

Nickel base alloys due to their high performances have been widely used in biomass and coal fired power plants. They can undertake plastic deformation with different strain rates such as those typically seen during creep and fatigue at elevated temperatures. In this study, the mechanical behaviors of Alloy 617 with strain rates from 10-2/s down to 10-6/s at temperatures of 650°C and 700°C have been studied using tensile tests. Furthermore, the microstructures have been investigated using electron backscatter detection and electron channeling contrast imaging. At relatively high strain rate, the alloy shows higher fracture strains at these temperatures. The microstructure investigation shows that it is caused by twinning induced plasticity due to DSA. The fracture strain reaches the highest value at a strain rate of 10-4/s and then it decreases dramatically. At strain rate of 10-6/s, the fracture strain at high temperature is now smaller than that at room temperature, and the strength also decreases with further decreasing strain rate. Dynamic recrystallization can also be observed usually combined with crack initiation and propagation. This is a new type of observation and the mechanisms involved are discussed.

scholarly journals Influence of Strain and Stress Triaxiality on the Fracture Behavior of GB 35CrMo Steel during Hot Tensile Testing

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Zheng Li ◽  
Yajun Zhou ◽  
Sanxing Wang
Keyword(s):  
High Temperature ◽  
Tensile Testing ◽  
Crack Formation ◽  
Fracture Strain ◽  
Stress Triaxiality ◽  
Fracture Morphology ◽  
Tensile Tests ◽  
35Crmo Steel ◽  
Size Growth ◽  
High Temperature Tensile

To better understand cavitation nucleation and crack initiation in 35CrMo steel during high-temperature tensile processing and the effect of stress triaxiality on its fracture behaviors, uniaxial and notch high-temperature tensile tests were performed. The microstructure, fracture morphology, fracture strain, and stress triaxiality of the tested 35CrMo steel were then characterized and discussed. The results showed that crack formation in 35CrMo steel included stages of nucleation, growth, and microcavity aggregation. Scanning electron microscopy and energy-dispersive X-ray spectroscopy demonstrated that crack formation was closely related to the presence of steel inclusions. High-temperature tensile testing of samples with different notch radii showed that the fracture strain of 35CrMo steel was decreased with increasing stress triaxiality, that is, increased stress levels corresponded to decreased material plasticity. In addition, the recrystallization degree was decreased with increased stress triaxiality, and the grain size growth was slowed. The failure of 35CrMo steel occurred via ductile fracture, and low stress triaxiality, and high temperature conditions induced large and deep dimples on the fracture surface.

Tensile Behavior and Microstructural Evolution of the Polycrystalline Nickel-Based Superalloy Applied in Turbine Disk

2017 ◽  
Vol 0 (0) ◽  
Author(s):  
Xiuli Shen ◽  
Shaojing Dong ◽  
Zhiying Chen
Keyword(s):  
Microstructural Evolution ◽  
Tensile Tests ◽  
Tensile Behavior ◽  
Turbine Disk ◽  
Strain Rates ◽  
Mechanical Behaviors ◽  
Polycrystalline Nickel ◽  
Nickel Based Superalloy ◽  
Different Temperatures

AbstractIn the present study, the mechanical behaviors and microstructural evolution of the nickel-based superalloy FGH97 at different temperatures and strain rates were studied. First, the tensile tests were conducted at temperatures of 20 °C, 450 °C and 700 °C, respectively, at two specified strain rates of 0.00025 s

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