Comprehensive Strengthening of Microalloyed Pure Gold

2015 ◽  
Vol 713-715 ◽  
pp. 2617-2623
Author(s):  
Jun Ping Yuan ◽  
Chun Yu Ma ◽  
Chang Wang
Keyword(s):  
Solid Solution ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Pure Gold ◽  
Solid Solution Strengthening ◽  
Fine Grain ◽  
Performance Requirements ◽  
Fine Grain Strengthening ◽  
Solution Strengthening ◽  
And Performance

The hardness of pure gold jewellery is low which makes it difficult to meet structural design and performance requirements, and restricts its artistic value. In this research, scandium, calcium, and magnesium were used as alloying elements with pure gold, and the microstructure and hardening behaviour of modified pure gold were studied through cold-working, solid solution, and aging treatment. The results showed that the as-cast hardness of an Sc-Ca-Mg alloyed pure gold could reach HV64: after solution treatment at 700 °C, the hardness could reach HV55, and the microstructure in its solid solution state presented a homogeneous single phase. When the modified pure gold was deformed and the deformation rate reached 80%, the hardness reached HV118, after aging treatment at 250 °C and small precipitation phases were dispersed in its structure; the resultant grain size was finer than that of pure gold, and the hardness reached HV133. The hardening behaviour of this modified pure gold was the comprehensive effect of solid solution strengthening, fine-grain strengthening, deformation strengthening, and precipitation strengthening.

Microstructure and Mechanical Properties of Backward-Extruded Mg-Zn-xCa Biomaterials

2013 ◽  
Vol 747-748 ◽  
pp. 426-430
Author(s):  
Xue Jun Li ◽  
Hui Li ◽  
Shuang Shuang Zhao ◽  
Ning Ma ◽  
Qiu Ming Peng
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Solid Solution Strengthening ◽  
Backward Extrusion ◽  
Fine Grain ◽  
Fine Grain Strengthening ◽  
Microstructure And Mechanical Properties ◽  
Solution Strengthening ◽  
Extrusion Technology ◽  
Precipitate Strengthening

The Mg-1.0Zn-xCa (x=0.2, 0.5, 0.8, 1 wt. %) alloys were prepared by zone solidification and backward extrusion technology. The microstructure and mechanical properties of backward-extruded Mg-1.0Zn-xCa alloys were investigated. The results showed that these backward-extruded Mg-1.0Zn-xCa alloys were mainly composed of equi-axed pentagon-shaped grains and some Mg0.9Zn0.03 precipitates. The tensile and compressive strengths of backward-extruded Mg-1.0Zn-xCa alloys were greatly improved. The improved mechanical properties are mostly attributed to fine grain strengthening, solid solution strengthening and precipitate strengthening. The results demonstrated that the micro alloying of Ca element was one of effective method to improve the mechanical properties of Mg-1.0Zn based biomaterials.

Solid Solution Strengthening of Sm in Mg-10Y-1.5Sm Alloy

2011 ◽  
Vol 194-196 ◽  
pp. 1378-1381
Author(s):  
Qing Zhang ◽  
Quan An Li ◽  
Xiao Tian Jing ◽  
Chang Qing Li
Keyword(s):  
Solid Solution ◽  
Aging Treatment ◽  
Microstructure Analysis ◽  
Solid Solution Strengthening ◽  
Solution Strengthening ◽  
New Phase

By microstructure analysis and microhardness measuration, solid solution strengthening of Sm in Mg-10Y-1.5Sm alloy after solid solution and aging treatment was investigated. The results show that the microstructure of the alloy consists of α-Mg matrix and Mg24Y5 phase, and fine Mg24Y5 particles distribute in α-Mg matrix uniformly and dispersedly. No new phase forms after Sm addition, and Sm enhances α-Mg matrix and Mg24Y5 phase by solid solution effect. Compared with that of Mg-10Y alloy, the microhardness of the alloy with Sm addition increases obviously from HV87.7 to HV98.5.

scholarly journals Study on Porous Mg-Zn-Zr ZK61 Alloys Produced by Laser Additive Manufacturing

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 635 ◽  
Author(s):  
Min Zhang ◽  
Changjun Chen ◽  
Chang Liu ◽  
Shunquan Wang
Keyword(s):  
Additive Manufacturing ◽  
Surface Morphology ◽  
Laser Energy ◽  
Laser Additive Manufacturing ◽  
Solid Solution Strengthening ◽  
Fine Grain ◽  
Fine Grain Strengthening ◽  
Solution Strengthening ◽  
Precipitated Phases

This study reports the effect of Zn contents on surface morphology, porosity, microstructure and mechanical properties of laser additive manufacturing (LAM) porous ZK61 alloys. The surface morphology and porosity of the LAMed porous ZK61 alloys depend on the laser energy input. With increasing Zn contents, the surface quality of porous Mg-Zn-Zr alloys became worse, the grains are obviously refined and the precipitated phases experienced successive transitions: MgZn → MgZn + Mg7Zn3 → Mg7Zn3. The microhardness was improved significantly and ranged from 57.67 HV to 109.36 HV, which was ascribed to the fine grain strengthening, solid solution strengthening and precipitation strengthening. The LAMed porous Mg-15 wt.% Zn-0.3 wt.% Zr alloy exhibits the highest ultimate compressive strength (73.07 MPa) and elastic modulus (1.785 GPa).

Influence of fine-grain and solid-solution strengthening on mechanical properties and in vitro degradation of WE43 alloy

2014 ◽  
Vol 9 (1) ◽  
pp. 015014 ◽  
Author(s):  
Dexue Liu ◽  
Yutian Ding ◽  
Tingbiao Guo ◽  
Xiaoqiong Qin ◽  
Chenggong Guo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
In Vitro Degradation ◽  
Solid Solution Strengthening ◽  
Fine Grain ◽  
Solution Strengthening ◽  
We43 Alloy

Microstructure Control of High Nitrogen Alpha + Beta Type Titanium Alloy

2007 ◽  
Vol 345-346 ◽  
pp. 193-196
Author(s):  
Tomohiro Ando ◽  
Koichi Nakashima ◽  
Toshihiro Tsuchiyama ◽  
Setsuo Takaki
Keyword(s):  
Solid Solution ◽  
Titanium Alloy ◽  
Martensite Plate ◽  
Aging Treatment ◽  
Plate Boundaries ◽  
High Nitrogen ◽  
Solid Solution Strengthening ◽  
Α Phase ◽  
Nitrided Specimen ◽  
Solution Strengthening

Solution nitriding and aging treatment were applied to Ti-4mass%Cr alloy in order to fabricate a ductile high-nitrogen titanium alloy with fine (α + β) structure. The solution-nitrided specimen withα’ martensitic structure was significantly hardened by solid solution strengthening by the absorbed nitrogen. During the aging treatment, fine β grains with a size of 1 microns in thickness precipitated along the martensite-plate boundaries. Although the specimen was softened to some extent after the aging treatment, the hardness is kept much higher than that of the aged Ti-4mass%Cr alloy without solution nitriding. This indicates that the nitrogen is still in solid solution of α phase even after the aging treatment, and contributes to strengthening of the fine-structured Ti-4mass%Cr-N alloy.

OLIN ALLOY C5218

Alloy Digest ◽  
2004 ◽  
Vol 53 (6) ◽  
Keyword(s):  
Solid Solution ◽  
Physical Properties ◽  
Tensile Properties ◽  
Bend Strength ◽  
Bronze Alloy ◽  
Solid Solution Strengthening ◽  
Solution Strengthening

Abstract Olin Alloy C5218 is a phosphor bronze alloy given both dispersion- and solid-solution strengthening for applications in the automotive connector market. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and bend strength. Filing Code: CU-715. Producer or source: Olin Brass.

Lattice distortion as an estimator of solid solution strengthening in high-entropy alloys

2021 ◽  
pp. 110877
Author(s):  
Ankit Roy ◽  
Praveen Sreeramagiri ◽  
Tomas Babuska ◽  
Brandon Krick ◽  
Pratik K. Ray ◽  
...  
Keyword(s):  
Solid Solution ◽  
Lattice Distortion ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Solid Solution Strengthening ◽  
Solution Strengthening

scholarly journals Strength, Hardness, and Ductility Evidence of Solid Solution Strengthening and Limited Hydrogen Embrittlement in the Alloy System Palladium-Copper (Cu wt. % 5–25)

Hydrogen ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 262-272
Author(s):  
Sebastian DiMauro ◽  
Gabrielle Legall ◽  
Coleman Lubinsky ◽  
Monica Nadeau ◽  
Renee Tait ◽  
...  
Keyword(s):  
Solid Solution ◽  
Hydrogen Embrittlement ◽  
Copper Content ◽  
Vickers Microhardness ◽  
Copper Alloys ◽  
Alloy System ◽  
Weight Percent ◽  
Solid Solution Strengthening ◽  
Solution Strengthening ◽  
Palladium Copper Alloys

Strength, hardness, and ductility characteristics were determined for a series of palladium-copper alloys that compositionally vary from 5 to 25 weight percent copper. Alloy specimens subjected to vacuum annealing showed clear evidence of solid solution strengthening. These specimens showed, as a function of increasing copper content, increased yield strength, ultimate strength, and Vickers microhardness, while their ductility was little affected by compositional differences. Annealed alloy specimens subsequently subjected to exposure to hydrogen at 323 K and PH2 = 1 atm showed evidence of hydrogen embrittlement up to a composition of ~15 wt. % Cu. The magnitude of the hydrogen embrittlement decreased with increasing copper content in the alloy.

Sign in / Sign up

Export Citation Format

Share Document