With a high-power and short-pulse Nd:YAG laser,TC17 titanium alloys are processed by laser peening(LP),the isothermal oxidation weight gain experiment at the temperature of 400 ℃is carried out,and the effect of LP on the isothermal oxidation performance of titanium alloys is analyzed.The study results show that,as for the TC17 titanium alloys after LP,if compared with those before LP,the isothermal oxidation weight gain at 400℃decreases by 64.9%,and the oxide film on the material surface becomes more dense,...