Table 3.1.2.1.6: Values of Room-Temperature Plane-Strain Fracture Toughness of Aluminum Alloys"-Concluded · MIL-HDBK-5J

Alloy/Temper^b	Product Form	Orien- tation^c	Product Thickness Range, inches	Number of Sources	Sample Size	Specimen Thickness Range, inches	K_IC, ksi√in.
Alloy/Temper^b	Product Form	Orien- tation^c	Product Thickness Range, inches	Number of Sources	Sample Size	Specimen Thickness Range, inches	Max.	Avg.	Min.	Coefficient of Variation	Minimum Specification Value
7075-T76511	Extrusion	L-T	1.3-7.0	4	11	1.2-2.0	41	35	31	11.0
7075-T76511	Extrusion	T-L	1.2	3	42	0.6-2.0	36	28	20	15.5
7150-T77511	Extrusion	L-T	0.76	1	52	0.5	36	31	26	7.7	22
7150-T77511	Extrusion	T-L	0.76	1	52	0.5	27	24	22	5.1	20
7175-T6/T6511	Extrusion	T-L	---	2	25	0.8-1.0	24	21	19	7.9
7175-T651	Plate	L-T	---	1	17	0.7-0.8	30	26	23	9.2
7175-T651	Plate	T-L	---	1	10	0.7-0.8	26	23	20	9.8
7175-T6511	Extrusion	L-T	---	2	14	0.8-1.0	36	30	25	13.8
7175-T7351	Plate	L-T	---	2	30	0.7-1.6	36	34	32	3.3
7175-T7351	Plate	T-L	---	2	32	0.7-1.6	30	27	25	4.5
7175-T73511	Extrusion	L-T	≥0.7	5	43	0.5-1.5	47	37	32	16.0	30
7175-T73511	Extrusion	T-L	≥0.5	5	43	0.5-1.5	35	25	20	10.9	22
7175-T74	Die Forging	L-T	≥0.5	3	14	0.5-1.0	38	30	26	15.0	27
7175-T74	Die Forging	T-L	≥0.5	2	13	0.5-1.0	33	24	21	15.7	21
7175-T74	Die Forging	S-L	≥0.5	4	41	0.5-0.8	31	26	20	8.6	21
7175-T74	Hand Forging	T-L	3.0-5.0	2	10	1.0-1.5	29	26	24	4.8	25
7175-T7651	Clad Plate	L-T	---	1	53	1.5	33	31	30	4.3
7175-T7651	Clad Plate	T-L	---	1	50	0.6	28	27	25	3.1
7175-T7651	Plate	L-T	---	1	12	1.5	32	31	31	1.7
7175-T7651	Plate	T-L	---	1	11	1.5	26	25	24	3.3
7175-T76511	Extrusion	L-T	1.4-3.8	2	48	0.6-2.0	39	34	28	10.7
7175-T76511	Extrusion	T-L	≥0.6	4	49	0.6-1.8	31	25	20	9.8
7475-T651	Plate	L-T	---	3	34	0.9-2.0	49	38	30	9.2	30
7475-T651	Plate	T-L	0.6-2.0	2	143	0.6-2.0	43	34	27	9.8	28
7475-T651	Plate	S-L	≥0.6	1	23	0.5-1.0	36	28	22	14.9
7475-T7351	Plate	L-T	1.3-4.0	8	151	1.3-3.0	60	47	40	10.4	^d
7475-T7351	Plate	T-L	≥1.3	7	132	0.7-3.0	50	44	37	10.4	^d
7475-T7351	Plate	S-L	≥0.7	7	74	0.5-1.5	36	30	25	8.7	25
7475-T7651	Plate	L-T	1.0-2.0	4	10	1.0-2.0	46	41	36	6.2	33
7475-T7651	Plate	T-L	≥1.0	2	15	0.9-2.0	50	36	29	14.5	30

These values are for information only.

c Refer to Figure 1.4.12.3 for definition of symbols.