**Surface Treatment of Aluminium Alloys**

112 Recent Trends in Processing and Degradation of Aluminium Alloys

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**6** 

*Shahin Shahr,* 

*Iran* 

**Laser Surface Treatments of Aluminum Alloys** 

*Materials Science and Engineering Department, Malek Ashtar University of Technology,* 

Advanced industrial applications require materials with special surface properties such as high corrosion and wear resistance and hardness. Alloys possessing these properties are usually very expensive and their utilization drastically increases the cost of the parts. On the other hand, failure or degradation of engineering components due to mechanical and chemical/electrochemical interaction with the surrounding environment is most likely to initiate at the surface because the intensity of external stress and environmental attack are

The engineering solution to prevent or minimize such surface region of a component through a procedure known as surface engineering. Conventionally practiced surface engineering techniques like carburizing, nitriding, etc. are often material specific,

Among the surface engineering techniques, a relatively new and attractive method is laser surface treatment. In other words, laser surface treatment offers an excellent scope for tailoring the surface microstructure and/or composition of a component and proves

For most engineering application, the laser, in simple terms, can be regarded as a device for producing a finely controllable energy beam, which, in contact with a material, generates considerable heat. The basic physics of laser surface treatment is simply heat generation by laser interaction with the surface of an absorbing material and subsequent cooling either by heat conduction into the interior, or by thermal reradiation at high temperatures from the surface of the material. Various laser surface treatment methods that are currently available

Figure 2 shows general regimes of various laser surface treating parameters for both pulsed and continuous wave lasers. Short pulses (ns to fs) with high peak power densities are desirable for laser shock processing and ablation applications. In general, longer pulses (μ<sup>s</sup> to ms) or continuous wave lasers are preferred for melting and heating processes

Laser chemical vapor deposition and laser surface transformation hardening require lower densities and interaction times as compared to processes involving meting and vaporization.

time/energy/manpower intensive and lacking in precision.

**2. Laser – assisted materials surface treatment requirements** 

superior to conventionally surface engineering.

**1. Introduction** 

often highest at the surface.

are shown in figure 1.

(Nagarathnam & Taminger, 2001).

Reza Shoja Razavi and Gholam Reza Gordani
