Black colour, its hardness is higher than that of WA, its toughness is a bit lower.
黑色，有光泽，硬度比白刚玉高，韧性较低。
The strength and hardness is higher, but the toughness is lower after heat treatment.
处理后的强度、硬度较高，但冲击韧度较低。
With the same deforming times, the grains are bigger in T6 conditions than those in T5, but the hardness is higher.
在相同变形次数下，T6热处理状态比t 5热处理状态晶粒大，但硬度高。
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