摘要:

AbstractCopper alloys of composition Cu–35Zn–3Pb and Cu–31Ni–1·9Cr were laser treated and characterised using optical and scanning electron microscopy and stress corrosion experiments. Laser induced defects in the former alloy increased the variability in the time to failure by stress corrosion cracking in the laser treated specimens relative to the bulk. The latter alloy, when laser treated, has a defect free surface which is more resistant to pitting in sea water than that of the bulk and is not susceptible to stress corrosion cracking despite the stress corrosion cracking sensitivity of conventional gas metal arc welds in this alloy. Practically, the results suggest that laser induced defects may limit the acceptable process window of laser treated copper alloys intended for use in sea water.MST/1975

ISSN:0267-0836    

DOI:10.1179/mst.1994.10.3.250

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

AbstractParticle reinforced composites are being considered, in applications requiring an increased elastic modulus, over unreinforced alloys, and in many cases the increased modulus is also required at elevated temperatures. In this paper the temperature dependence of the elastic modulus is examined using a laser ultrasound technique. It is demonstrated that this non-contact method is capable of measuring the modulus up to temperatures of 700 K and is sufficiently sensitive to detect microstructural changes in some instances. In composites which have a stable microstructure over the temperature range from room temperature to 700 K, the elastic modulus decreases linearly with increasing temperature.MST/1894

ISSN:0267-0836    

DOI:10.1179/mst.1994.10.3.257

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

ISSN:0267-0836    

DOI:10.1179/mst.1994.10.3.263

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor